Published: 2026 | Last updated: May 2026
Ramshot Magnum is a slow-burning, double-base spherical powder manufactured by PB Clermont in Belgium and distributed in North America by Western Powders. It is one of the densest common magnum rifle powders available, with a bulk density of 1.002 g/cc – higher than any extruded slow-magnum powder and substantially denser than Hodgdon H1000 at 0.910 g/cc or Alliant Reloder 25 at 0.950-0.965 g/cc. This density is the powder’s defining technical characteristic and drives both its primary advantage – ball powder metering consistency in large magnum cases – and its primary limitation, a high deterrent coating requirement that demands robust primer ignition.
The burn rate position places Ramshot Magnum in the slow-magnum class comparable to Hodgdon H1000 and slightly faster than Hodgdon Retumbo. Its primary competition on the market is exactly that comparison: H1000 is single-base with Extreme series temperature stability (0.21 fps per degree) and produces less velocity; Ramshot Magnum is double-base with higher energy density and more temperature sensitivity (0.87 fps per degree). The trade-off is honest, documented, and defines which applications favor each powder.
This article is based on published manufacturer specifications, established load data, and documented field reports. Specifications and performance figures can vary between lots, rifles, and conditions. If you have loaded Ramshot Magnum in practice – leave a comment below: real-world experience from the reloading bench is what separates verified data from manufacturer claims.
Powder Description and Technical Profile
Ramshot Magnum is a double-base, spherical powder manufactured at the PB Clermont facility in Clermont, Belgium. PB Clermont is one of Europe’s established propellant manufacturers with a significant presence in the North American reloading market through both the Ramshot and Accurate product lines, which share the same manufacturing origin.
The double-base chemistry – nitrocellulose plus nitroglycerin – provides higher energy per gram than single-base alternatives at this burn rate position. In large-capacity magnum cases like 300 Winchester Magnum, 7mm Remington Magnum, and 338 Lapua Magnum, the nitroglycerin content allows Ramshot Magnum to reach higher velocities at the same chamber pressure than H1000 at comparable charge weights.
The spherical geometry produces the metering behavior that distinguishes ball powders from any extruded alternative. Uniform spheres pack into a measure drum with consistent orientation regardless of cycling speed. They flow through drop tubes without bridging. In practice, Ramshot Magnum meters with charge-to-charge variance under 0.05-0.08 grains on well-adjusted progressive equipment – significantly better than the 0.2-0.4 grain variance typical of extruded slow-magnum powders like H1000 or Alliant Reloder 25. For a reloader producing large quantities of 300 Winchester Magnum or 7mm Remington Magnum match ammunition on a progressive press, this metering advantage is the most practically relevant property.
Bulk density at 1.002 g/cc is the highest of any common slow-magnum powder. This extreme density means that Ramshot Magnum occupies less case volume per grain of charge than any extruded competitor. The practical consequence: at working charge weights in 7mm Remington Magnum and 300 Winchester Magnum, case fill is typically 85-92% – lower than what extruded powders produce at comparable pressures. This is not a problem in itself, but it means visual case fill inspection is a less reliable maximum pressure indicator when switching from extruded to Ramshot Magnum. The case looks less full than expected, but pressure is appropriate. Rely on published charge weights, not visual case fill comparison.
The heavy deterrent coating required by the spherical chemistry to achieve this slow burn rate is the source of the primer requirement. The dense coating on each grain requires adequate brisance to penetrate consistently. Standard large rifle primers may produce variable ignition in large-capacity cases; magnum large rifle primers are the documented appropriate choice for all Ramshot Magnum applications.
The progressive pressure curve from the spherical geometry sustains velocity development through long magnum barrels. The sustained push produces velocity results competitive with double-base extruded alternatives at the same burn rate.
Strengths:
- Exceptional metering consistency (under 0.05-0.08 grains) from spherical geometry – better than any extruded alternative in this burn rate class; enables accurate progressive press production of magnum ammunition
- High energy density from double-base chemistry produces top-tier velocities in large magnum cases compared to single-base alternatives
- Highest bulk density (1.002 g/cc) of any common slow-magnum powder – more charge mass per unit of case volume
- Progressive pressure curve sustains acceleration through 24-28 inch magnum barrels
- Clean burning at high pressure levels in the large cases where it operates most efficiently
- PB Clermont manufacturing quality – European precision manufacturing with documented lot-to-lot consistency
Limitations:
- Temperature sensitivity of 0.87 fps per degree Fahrenheit – substantially more sensitive than H1000’s 0.21 fps or Retumbo’s ~0.3 fps. Requires temperature-aware load development for long-range applications
- Heavy deterrent coating requires magnum primers in all applications – standard large rifle primers produce inconsistent ignition
- Lower case fill percentage than extruded alternatives at the same pressure – visual inspection less reliable as a maximum pressure indicator
- Double-base higher flame temperature compared to single-base alternatives – more throat erosion in 338 Lapua and 300 Winchester Magnum barrels over extended round counts
- Temperature sensitivity requires development protocol – loads must be developed at maximum field temperature to ensure safety across the seasonal range
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | PB Clermont (Belgium) / Western Powders (NA Distribution) |
| Type | Double-Base Spherical (Ball) |
| Bulk Density (g/cc) | 1.002 |
| Grain Shape | Spherical |
| Coating | Heavy Graphite and Deterrent Coating |
| Burn Rate Category | Slow Rifle (Magnum) |
| Temperature Stability | ~0.87 fps / °F |
| Primer Requirement | Large Rifle Magnum |
The Ramshot Magnum vs. Ramshot Grand Distinction
The original article’s brief mention of Ramshot Grand as “the newest addition” deserves more specific treatment because the two powders serve overlapping but distinct applications and are frequently confused.
Ramshot Grand burns slightly faster than Ramshot Magnum and was specifically developed to address the temperature sensitivity that limits Magnum’s year-round precision applications. It carries additional additives including a copper fouling reducer. Its primary targets are cartridges in the 6.5 PRC, 7mm PRC, and 300 PRC class where a more temperature-stable ball powder is specifically appropriate.
Ramshot Magnum remains the appropriate Ramshot choice for the larger, slower applications: 7mm Remington Magnum at full power, 300 Winchester Magnum with standard-to-heavy bullets, and 338 Lapua Magnum at standard competition weights. For the newer precision cartridges where a slightly faster burn is more efficient, Ramshot Grand is the more specifically optimized choice.
The two are not interchangeable by application or charge weight.
Temperature Sensitivity – Practical Impact
0.87 fps per degree Fahrenheit places Ramshot Magnum in the moderate sensitivity category – better than Alliant Reloder 25 at 1.75 fps/°F but significantly more sensitive than Hodgdon H1000 at 0.21 fps/°F.
For a 300 Winchester Magnum load developed at 70°F producing 3,000 fps with a 180-grain bullet, a typical North American hunting scenario from September to January covers approximately 80°F of temperature swing:
- Ramshot Magnum at 0.87 fps/°F: 80°F x 0.87 = 70 fps variation between September and January conditions
- At 600 yards with a 180-grain bullet, 70 fps produces approximately 3-4 inches of vertical deviation from the September zero
- At 400 yards, the same variation produces approximately 1.5-2 inches of vertical shift
For hunters shooting at typical hunting distances (under 400 yards), this variation is within the kill zone of large game. For long-range precision work at 600+ yards, the variation requires temperature-corrected drop charts or the use of a more thermally stable powder.
The correct protocol: develop maximum charge weight at the highest temperature you will shoot the rifle at. A load validated at 90°F is safe year-round. A load validated at 50°F may produce elevated pressure in summer heat.
| Powder | Stability | 80°F Swing | At 600 yards |
|---|---|---|---|
| Hodgdon H1000 | 0.21 fps/°F | ~17 fps | <1″ |
| Hodgdon Retumbo | ~0.3 fps/°F | ~24 fps | ~1″ |
| Ramshot Grand | ~0.5 fps/°F | ~40 fps | ~2″ |
| Ramshot Magnum | 0.87 fps/°F | ~70 fps | ~3-4″ |
| Alliant Reloder 25 | ~1.75 fps/°F | ~140 fps | ~7-8″ |
Burn Rate Comparison and Competing Powders
| Powder | Type | Density (g/cc) | Key Character |
|---|---|---|---|
| Accurate MagPro | Double-Base Spherical | 0.950 | Slightly Faster – ball powder, short magnums |
| Ramshot Hunter | Double-Base Spherical | 0.940 | Faster – standard magnum range |
| Alliant Reloder 26 | Double-Base Extruded | 0.989 | Similar – EI tech, higher velocity |
| Hodgdon H1000 | Single-Base Extruded | 0.910 | Similar – Extreme stability, less velocity |
| Ramshot Magnum | Double-Base Spherical | 1.002 | Reference |
| Alliant Reloder 25 | Double-Base Extruded | 0.950-0.965 | Similar – higher temp sensitivity |
| Hodgdon Retumbo | Single-Base Extruded | 0.925 | Slightly Slower – Extreme, ultra-overbore |
| Norma MRP | Single-Base Extruded | 0.910 | Similar – European single-base |
| Vihtavuori N570 | Double-Base Extruded | 0.960 | Similar – European, benchrest record |
vs. Hodgdon H1000: The central market comparison. H1000 is single-base with Extreme series stability (0.21 fps/°F vs Magnum’s 0.87 fps/°F) and produces less velocity from its lower energy density. It meters inconsistently from extruded geometry vs Ramshot Magnum’s ball powder precision. For year-round hunting across seasonal temperature extremes where consistent POI is required, H1000 is the more conservative choice. For high-volume progressive press loading where metering consistency drives session productivity and temperature management is acceptable, Ramshot Magnum is the more practical tool.
vs. Accurate MagPro: Accurate MagPro is a double-base spherical powder from the same PB Clermont manufacturing origin, slightly faster in burn rate. It is the more appropriate Accurate/Ramshot choice for short-action magnum cartridges – 270 WSM, 300 WSM, 7mm WSM – where Ramshot Magnum’s slightly slower burn peaks pressure too late for maximum efficiency. For standard belted magnums, Ramshot Magnum is better matched. Both offer ball powder metering.
vs. Alliant Reloder 26: Reloder 26 is a double-base extruded powder with Nitrochemie’s EI impregnation technology (0.5 fps/°F stability) and high energy density. It produces comparable or slightly higher velocities than Ramshot Magnum in 300 Winchester Magnum and 7mm Remington Magnum at the same pressure. Ramshot Magnum meters better from ball geometry. Reloder 26 is more temperature-stable. For single-stage precision loading, Reloder 26 is a competitive alternative. For progressive press production, Ramshot Magnum has the metering edge.
vs. Hodgdon Retumbo: Retumbo burns slightly slower and belongs to the Extreme series with ~0.3 fps/°F stability. It is the appropriate Extreme series choice for ultra-overbore cases – 300 RUM, 30-378 Weatherby – where Ramshot Magnum may reach pressure efficiently before the bullet clears the longer bore. For standard belted magnums, Ramshot Magnum’s slightly faster burn is better matched; for ultra-magnums, Retumbo is more appropriate.
Recommended Cartridges and Applications
Ramshot Magnum operates efficiently in large-capacity belted and rebated magnum cases with heavy-for-caliber bullets. Its burn rate is too slow for standard-capacity cartridges and appropriate for the standard belted magnum class – not the ultra-overbore cases where Retumbo is better suited.
| Cartridge | Bullet Weight Range | Notes |
|---|---|---|
| 300 Winchester Magnum | 180-220 gr | Primary application |
| 7mm Remington Magnum | 154-180 gr | Standard to heavy hunting and match |
| 338 Lapua Magnum | 250-285 gr | Standard ELR competition weights |
| 338 Winchester Magnum | 200-250 gr | Full hunting loads |
| 300 Weatherby Magnum | 180-200 gr | Standard weight Weatherby |
| 7mm Weatherby Magnum | 154-175 gr | Full-power Weatherby loads |
| 6.5-284 Norma | 130-156 gr | Verify case fill – may be tight |
| 270 Winchester | 150-160 gr | Heavy-bullet only |
Low case fill note: Because of Ramshot Magnum’s high density (1.002 g/cc), case fill at working pressures in 7mm Remington Magnum and 300 Winchester Magnum typically runs 85-92% – lower than the 93-98% produced by extruded powders at comparable pressure. This is normal behavior for high-density ball powders and does not indicate a pressure problem. Do not attempt to increase charges to match extruded powder case fill levels – develop from published charge weights.
The 6.5-284 Norma application requires specific verification. The 6.5-284 case with 130-140 grain bullets may show very low case fill with Ramshot Magnum at working pressures, which can introduce position sensitivity. Verify against published data and check case fill percentage before confirming the load.
Bullets
Ramshot Magnum produces best results paired with heavy, high-BC projectiles in its primary magnum bore sizes. The sustained pressure profile from the spherical geometry benefits bullets with substantial bearing surface where progressive acceleration matters.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Berger | Hybrid Target | 195-215 gr | 300 Win Mag / 300 Wby | ELR Competition |
| Berger | VLD Hunting | 168-195 gr | 300 Win Mag / 7mm Rem Mag | Long-Range Hunting |
| Hornady | ELD-M | 162-212 gr | 7mm Rem Mag / 300 Win Mag | Long-Range Match |
| Hornady | ELD-X | 162-195 gr | 7mm Rem Mag / 300 Win Mag | Long-Range Hunting |
| Sierra | MatchKing | 175-220 gr | 300 Win Mag / 7mm Rem Mag | Competition |
| Sierra | Tipped MatchKing | 175-200 gr | 300 Win Mag | Match Accuracy |
| Nosler | AccuBond | 175-200 gr | 7mm Rem Mag / 300 Win Mag | Bonded Hunting |
| Nosler | Partition | 175-200 gr | 7mm Rem Mag / 300 Win Mag | Classic Big Game |
| Lapua | Scenar-L | 250-285 gr | 338 Lapua Magnum | ELR Competition |
| Barnes | LRX | 168-200 gr | 7mm Rem Mag / 300 Win Mag | Lead-Free Long Range |
| Federal | Trophy Bonded | 165-200 gr | 300 Win Mag | Premium Hunting |
Have you loaded Ramshot Magnum? Your practical data on charge weights, accuracy nodes, temperature behavior, or metering experience helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Magnum large rifle primers are mandatory for Ramshot Magnum in all applications. The heavy deterrent coating on the spherical grains requires the additional brisance of a magnum primer for consistent, complete ignition through the powder column. Standard large rifle primers consistently produce elevated extreme spread and occasional hangfires with this powder in large-capacity cases.
| Primer | Type | Application |
|---|---|---|
| Federal GM215M | Large Rifle Magnum Match | Competition precision – gold standard |
| CCI 250 | Large Rifle Magnum | General magnum applications |
| Winchester WLRM | Large Rifle Magnum | Consistent hunting and match loads |
| Remington 9-1/2M | Large Rifle Magnum | Standard magnum hunting choice |
| Federal 215 | Large Rifle Magnum | Maximum ignition for large cases |
| CCI BR-2 | Large Rifle Benchrest | Competition where brisance is adequate |
| RWS 5337 | Large Rifle Magnum | Premium European precision option |
| Fiocchi Large Rifle Magnum | Large Rifle Magnum | Consistent alternative |
When switching from standard to magnum primers in load development, reduce the starting charge by 5% and work back up. Magnum primers add brisance that can push a load safe with standard primers into elevated pressure territory. This applies especially when moving from an extruded powder load (which may have used standard primers) to Ramshot Magnum in the same cartridge.
Metering and Equipment Compatibility
Ramshot Magnum’s ball geometry is its primary practical advantage over extruded competitors in this burn rate class. On quality progressive press equipment, variance under 0.05-0.08 grains is achievable – a level that makes accurate magnum ammunition production at volume practical without constant scale verification.
For high-volume production on a Dillon XL 750, Dillon RL 1100, or Hornady Lock-N-Load AP, the spherical grains flow with near-liquid consistency through the Dillon Precision Case Activated Powder Measure Assembly. Setup verification at session start and periodic scale checks every 50-100 rounds are appropriate practice.
For single-stage precision loading, auto-dispensers including the RCBS ChargeMaster Supreme, RCBS MatchMaster, and Hornady Auto-Charge Pro handle Ramshot Magnum efficiently. The uniform dense grains trickle quickly without bridging.
One practical note on static electricity: high-density ball powders can accumulate static charge in plastic hoppers under low humidity. Grounding the measure’s drop tube or wiping the hopper with an anti-static dryer sheet eliminates this. Static causes grains to cling to hopper walls and bridge the drop tube, producing inconsistent throws that undermine the ball geometry’s metering advantage.
Reloading Safety Notes
All charge weights must come from current published Ramshot/Western Powders load data for Ramshot Magnum specifically. Hodgdon’s online data tool also covers Western Powders products. Do not substitute H1000, Alliant Reloder 26, or Alliant Reloder 25 charge weights without independent verification.
Temperature protocol is mandatory: develop maximum charge at the highest temperature you will shoot. At 0.87 fps/°F, a load at maximum charge in 55°F conditions may produce elevated pressure at 95°F summer heat.
Visual case fill is not a reliable pressure indicator with Ramshot Magnum. The high density produces lower case fill percentage than extruded powders at the same pressure. A case that looks 88% full is not undermaxed – it may be at appropriate maximum pressure. Rely on published data, not visual comparison to extruded powder loads.
Start 10% below the listed maximum and work up in 0.3-grain increments. Watch for flattened primers, stiff bolt lift, and ejector marks.
See the overpressure in reloading guide for systematic pressure sign identification.
FAQ
Is Ramshot Magnum accurate enough for competition use?
Yes – the ball geometry’s consistent metering produces low standard deviations that are competitive with any extruded powder in the same burn rate class when charges are verified by weight. The temperature sensitivity (0.87 fps/°F) is the competition limitation for year-round use, not accuracy potential. For indoor competition or outdoor competition within a single season, the temperature concern is minimal. For year-round outdoor precision competition across seasonal extremes, H1000 or Ramshot Grand are more stable choices.
Why does the case look less full than with H1000 at the same pressure?
Ramshot Magnum’s bulk density (1.002 g/cc) is substantially higher than H1000’s 0.910 g/cc. A denser powder generates the same pressure in less volume – hence lower case fill percentage at comparable pressure. This is normal, expected behavior. Do not increase charge weights to match extruded powder case fill levels; that would produce excess pressure.
Can Ramshot Magnum be used in 300 RUM or other Ultra Magnums?
The 300 RUM and similar ultra-large cases may produce very low case fill percentages with Ramshot Magnum at working pressures, potentially introducing position sensitivity. Hodgdon Retumbo or Alliant Reloder 33 are better matched to ultra-overbore cases. Verify against published Ramshot data for the specific cartridge before loading.
Conclusion
Ramshot Magnum fills a specific and useful position in the slow-magnum powder market: the best-metering option in its burn rate class for high-volume progressive press production of 300 Winchester Magnum, 7mm Remington Magnum, and 338 Lapua Magnum precision ammunition. The ball geometry advantage over extruded alternatives is real and consistent. The temperature sensitivity (0.87 fps/°F) is real and requires management. The magnum primer requirement is non-negotiable.
For a long-range hunter or competition shooter who loads magnum ammunition at volume on progressive equipment and can implement a temperature-aware load development protocol, Ramshot Magnum is a well-engineered tool that earns its place on the bench.
Choose Ramshot Magnum if you load 300 Winchester Magnum, 7mm Remington Magnum, or 338 Lapua Magnum at volume on a progressive press and want ball powder metering consistency with double-base velocity in large magnum cases. Choose Hodgdon H1000 if Extreme series year-round temperature stability is the priority and extruded powder metering is acceptable. Choose Ramshot Grand if you load newer precision cartridges like 6.5 PRC, 7mm PRC, or 300 PRC and want ball powder metering with improved temperature stability. Choose Hodgdon Retumbo if ultra-overbore cases like 300 RUM are the primary application and Extreme stability is the priority.
Editor’s note: Published load data and manufacturer specifications are the starting point – not the final word. Field experience from reloaders who have actually worked with this powder is the most reliable guide to what it does in practice. If you have used Ramshot Magnum, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision added the Ramshot Magnum vs. Ramshot Grand distinction section, expanded the temperature sensitivity section with specific fps and inches-of-deviation figures at 600 yards across an 80°F hunting-season swing, added the critical case fill warning explaining why low visual case fill does not indicate a low-pressure load, corrected the 6.5-284 Norma application with the position-sensitivity caveat, added the primer work-up note when switching from standard to magnum primers, extended the bullet and primer tables with full internal links, and added three community data disclaimer blocks in the correct blockquote format.
