Published: August 2026
I used to chase small groups. Everybody does when they start. You shoot a nice little clover leaf at 100 yards (91 meters), you get excited, you write the charge weight in the notebook with a star next to it, and three months later that same load is stringing vertical at 500 yards (457 meters) and you have no idea why. It took me a few ruined range days and a fair amount of wasted brass to figure out what was actually going on: a tight group at 100 yards tells you almost nothing about how consistent your velocity is, and velocity consistency is what actually holds a group together once distance stretches out. That is the whole reason the Satterlee Method exists, and it is the reason I use it now for every new barrel and every new cartridge I develop a load for.
What Everybody Tells You to Do First
Walk into any reloading forum thread on load development and you get two answers, repeated like scripture. Run a ladder test at 300 yards (274 meters) and look for where the group “comes together.” Or run OCW – round robin, three shots per charge, five targets, look for the charge where point of impact stays put across a few adjacent weights. Both of these get results some of the time. Neither one tells you anything directly about the number that actually matters for long-range consistency: standard deviation of your muzzle velocity.
For the paper-first version of that same search, the Ladder Test uses distance and vertical clustering to narrow the charge range before a more data-heavy confirmation pass.
I am not here to tell you those methods are garbage. They are not. But they are built around watching holes appear on paper, and paper at 100 yards forgives a lot of velocity spread that will absolutely find you at 600 or 1,000 yards. The Satterlee Method, developed by competitive shooter Scott Satterlee, flips the priority. Groups on paper are secondary. Standard deviation off the chronograph is primary. That single change in what you are actually measuring is why I switched.
If you want the full breakdown of the other methods and how they compare side by side, use our companion overview of the Ladder Test, OCW, and Satterlee before choosing a workflow.
The Protocol, As I Actually Run It
- Pick your charge range. I take the start-to-max range out of a current manual, average it against a second source if I have one, and use that as my window. Never trust one source blindly – lots vary, manuals get revised, and I have seen published max charges shift by close to a full grain between editions of the same book. And never start a work-up without reading through a real overpressure protocol first – a promising SD number at an unsafe pressure is not a load, it is an accident waiting for a range day.
- Load in small, even steps. For most mid-size rifle cartridges I am stepping 0.3 grains at a time. For something with a small case and a fast powder, I will tighten that up.
- Load 3 to 5 rounds per charge weight, not one. A single shot per charge is how you end up chasing ghosts – one flier and your whole “node” theory falls apart.
- Shoot over a chronograph, every string, no exceptions. I run a MagnetoSpeed because it is not sensitive to sun angle the way an optical unit can be, but any quality unit that gives you a trustworthy SD reading will do the job.
- Do NOT round robin. This is the part people get wrong constantly, because they have already read about OCW and assume it is the same drill. It is not. You shoot a complete string at one charge weight into one target, you let the barrel cool, you fully rebuild your position from scratch, and then you move to the next charge. Randomize your firing order across the session if you can – shoot them out of sequence rather than straight up the ladder, so any drift in your own form or in the rifle’s condition over the session does not stack on top of the highest charges and fake you into thinking pressure is doing something it is not.
- Record average velocity and standard deviation for every charge weight. Group size on the target gets recorded too, but it is your secondary number, not your primary one. This is also where powder choice starts to matter for your SD numbers before you even fire a shot – a well-metered extruded powder is going to throw more consistent charges off a trickler than a coarse spherical ball powder will off some measures, and if you do not already know the difference between single-base and double-base powder, read that before you pick a powder for a precision build.
- Find the charge, or narrow cluster of charges, with the lowest SD. That is your candidate. Not the smallest group. The lowest SD.
- Confirm with a bigger string before you commit. Ten rounds gets you a candidate. It does not get you a proven load. I always follow up with a larger confirmation string, and if I have the range access, I confirm again at distance before I call a load done.
Why I Trust This Over a Pretty Group at 100 Yards
Here is the thing nobody explains well enough. A rifle that produces a half-inch group at 100 yards with an SD of 25 fps can look identical on paper to one with an SD of 8 fps at that same distance. Send both of those loads to 700 yards and the one with the higher SD opens up into a vertical string that no amount of wind calling is going to save. Predictability beats a pretty group. I would rather have a load that groups three-quarters of an inch at 100 yards with single-digit SD than a half-inch group with SD in the twenties, every single time, because the three-quarter-inch load is the one that is still doing its job when the target moves out.
A Worked Example, For Illustration
I am not going to hand you a table and tell you “load this exact charge in your rifle” because that is exactly the kind of blind trust I am telling you not to extend to a forum post. But here is the shape of what a Satterlee screening pass looks like, using round numbers so you can see the pattern:
| Charge Weight (gr) | Avg Velocity (fps) | Standard Deviation (fps) | Group Size at 100 yd (in) |
|---|---|---|---|
| 41.0 | 2,745 | 18 | 0.85 |
| 41.3 | 2,761 | 22 | 0.62 |
| 41.6 | 2,779 | 9 | 0.91 |
| 41.9 | 2,798 | 11 | 0.78 |
| 42.2 | 2,814 | 24 | 0.55 |
Look at that table the way most people are trained to look at it and you grab 42.2 grains, because it printed the smallest group. Look at it the Satterlee way and 41.6 grains is your candidate, because single-digit SD at 9 fps is going to hold together at distance in a way that 24 fps of spread never will, no matter how good that one group looked on the day you shot it. This is illustrative only – your actual numbers will depend on your barrel, your brass, your primer, and your chronograph, and you need to run your own session, not copy mine.
Where the Round Count Actually Goes
People hear “10-round ladder test” and think this is a cheap method. It can be, for the first screening pass – Satterlee’s original approach can get you a candidate charge in as few as 10 rounds if you are running single shots per charge on the first pass to find your window. But I do not stop there, and if you are serious about a hunting or long-range load, you should not either. Add the confirmation string, add a distance check, and you are realistically 30 to 40 rounds deep before you call a charge weight locked. That is still fewer rounds than a full OCW work-up in most cases, and the data you walk away with is more directly tied to what actually breaks down at distance.
Equipment That Actually Matters Here
This method lives or dies on your chronograph. A cheap unit with a flaky Bluetooth connection or a mount that walks loose over a session will hand you garbage SD numbers, and garbage SD numbers sent through this whole process just produce a confidently wrong answer instead of an honestly uncertain one. I do not cut corners on this piece of equipment – it is the one place in this whole test where a bad reading poisons every decision downstream of it.
If you are already collecting calibration-quality chronograph data and want to compare this empirical screening approach with a predictive model, OBT and QuickLoad is the natural next read.
You also need a scale you trust completely, because 0.3-grain increments only mean something if your charges are actually landing where you think they are. I run digital units like the RCBS ChargeMaster Supreme and the Hornady Auto Charge Pro for this kind of work, and I check them against an RCBS check weight set before every single session, not once a month. A scale that has drifted 0.2 grains without you knowing it will quietly wreck a whole test session and you will never know why the data looks strange.
Brass consistency matters just as much as the powder charge. If your case volume is inconsistent round to round, your velocity spread is partly measuring your brass prep, not your powder charge, and you will chase a phantom SD problem that has nothing to do with the charge weight you are testing. Sort your brass by weight or better yet by actual capacity before you start, and do your case prep the same way for every round in the test – the Hornady Lock-N-Load Case Prep Center earns its bench space here because it keeps trimming and chamfering consistent across a big batch. I have torn a session apart before chasing a “bad charge weight” that turned out to be one batch of mixed-headstamp brass I should have sorted out before I ever loaded a round.
Cartridges Where I Lean on This Method Hardest
I run this on every wildcat build I put together, because factory load data does not exist for those cartridges and I am flying without a net anyway – I want the most direct signal I can get, and standard deviation off a chronograph is the most direct signal there is. The 277 Fury and its extreme long-range applications are a good example – when you are developing a custom load for something that new, you cannot lean on decades of forum consensus about where the “node” sits, because that consensus does not exist yet. You are the one generating it.
It is also my go-to for anything I am building toward 600 yards (549 meters) or beyond, where OCW’s 100-yard point-of-impact check simply cannot see the problem that is about to show up downrange. Cartridges like 6.5 PRC and 300 PRC are built from the ground up for that kind of distance work, and a load with a hidden SD problem will embarrass you at exactly the range where you needed it to perform. For a cartridge like 6mm Dasher or 22 ARC built for PRS or NRL work, where you are re-tuning between barrel changes and cannot afford a 40-round OCW work-up every time, the speed of this method is exactly what you need. Our guide on PRS versus NRL Dasher setups covers more of that context if that is the discipline you are shooting.
The Mistake I See Most Often
People run a 10-round Satterlee pass, find a low-SD candidate, and load up a hundred rounds of it for the season without ever confirming with a bigger string. Ten rounds spread across five charges is two shots and change per charge on your absolute minimum pass – that is not enough data to call anything final, it is enough to point you at a promising charge weight. I do not care how good the number looks on that first pass. Confirm it with a proper string before you commit a season’s worth of components to it. I learned this one the hard way more than once, and it always costs more in wasted components than the confirmation string would have.
Choose Satterlee If…
You have a quality chronograph, you are building a load meant to hold together well past 400 yards (366 meters), or you need to screen a wildcat or a new barrel quickly without the round count that a full OCW work-up demands.
Choose Something Else If…
You do not have a reliable chronograph and are not willing to invest in one – in that case this method is not for you, and OCW or a straightforward Ladder Test at distance will serve you better, since both can be run off paper alone.
If you do not have a chronograph yet and are still learning to read what the rifle and brass are telling you, the Classic Incremental Method is the better foundation before you move into velocity-first screening.
FAQ
Do I really need a chronograph, or can I estimate SD from group size? No. You cannot reliably back into standard deviation from group shape, especially from a small sample. Get a chronograph you trust or use a different method.
How is this different from OCW if both use multiple shots per charge? The firing sequence and the metric you are chasing are both different. OCW shoots round robin at the same point of aim across several targets and looks at point-of-impact stability. Satterlee shoots complete strings per charge with the position rebuilt between them and looks at standard deviation. They are not the same test wearing a different name.
What if my lowest-SD charge is not the same as my smallest group? That is normal, and it is the entire point of this method. Trust the SD number for anything you intend to shoot past a few hundred yards. A tight group with high SD is a load that got lucky on that string, not a load that is actually consistent.
Can I use this method for a hunting rifle, or is it only for competition? It works fine for hunting loads. A low-SD load is a more honest, repeatable load whether you are shooting at a target or at an animal, and it holds up better across the temperature swings a hunting season throws at you.
How many total rounds should I plan on for a full work-up? Budget 30 to 40 rounds for charge weight screening and confirmation. Add another 15 to 20 if you are also refining seating depth afterward, which most serious loads need. Our guide on tuning a bullet seating die covers that next step.
Where I Take This Next
Every load I lock in with this method gets logged and re-checked at the start of the next season, not trusted blind from last year’s notes. Charge weight is only half the story anyway – once I have my number, seating depth testing is next, and that is a whole separate fight I will get into another time. For now: stop trusting the pretty group, start trusting the number that tells you what happens when the target moves out to where it actually counts.
