- Thread starter sleeplz
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The Saterlee method is inappropriate for your combination. Scott was using heavy for caliber bullets (147's) and slow for caliber powders (4831 burn rate). He was packing them to 100+% load density at max pressures.
You are at least a grain over pressure. See that spike going from 42.3 to 42.6? That is what's called a clue.
You are at least a grain over pressure. See that spike going from 42.3 to 42.6? That is what's called a clue.
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For that combination I would expect the "sweet spot" to be found somewhere between 41.0 and 42.0 grains.
Going with the charges in the OP, personally I would load 3ea of 42.6, 42.7, 42.8 and 42.9. At 200y, shoot for group size, ES and SD. Once smallest vertical has been established, change seat depth in 5 thou increments to shrink horizontal.
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Yep, based on where pressure showed up, I would guess 41.5 or 41.7 grains.
I disagree. I've used a Magnetospeed to quickly and easily develop loads for everything under the sun. From 223 and 223 Ackley, up to 300 Norma and 338 Lapua. It has nothing to do with heavy for caliber bullets or fill capacity. I understand that those things have an impact on load development, but Scott's method works without taking any of that into consideration. Obviously if those things aren't in line, you wont land on a decent load. But any decent powder/bullet combination will work. Most certainly a 140gr bullet over H4350 is an easy load to work up.
And I dont think one round going fast is a sign of a spike. Maybe it is, maybe it isnt. I've had rounds that were faster than the following shot here and there. Most often its irrelevant to the load. It could be a simple mechanical or even human error.
OP; It looks to me like 42.8 is a very nice flat spot in your load that most likely indicates your accuracy node. In your shoes I would load 5 of them and run them across the chrono. If they look good, no signs of pressure, single SD, I would go to depth testing and be done.
Just my two bits
Edit: I just looked up my load on my 6.5 Creed. Its 42.4 for my AR10 gasser. And by no means over pressured as I run that rifle with a can.
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Your graph shows 2775 at 42.3. Are you saying 0.3 grains showed an increase of 175 fps?
You really need to stop trying to rely on a singular data point to establish velocity. You need to fire multiple rounds. I understand what you are trying to do, I just have not found that approach to be effective personally. I would start by loading 5 rounds each at 41.0, 41.5, and 42.0. Report back with the average velocity and SD for those charge weights. Fire them round robin.
I have used the components you are using in 3 different 6.5 Creedmoor barrels. The information in your chart aligns roughly with what I would expect at those charge weights. 2600 between 41.0 and 42.0 does not. Something is not right.
I have used the components you are using in 3 different 6.5 Creedmoor barrels. The information in your chart aligns roughly with what I would expect at those charge weights. 2600 between 41.0 and 42.0 does not. Something is not right.
I would quit trying to figure out how a load shoots without seeing how it shoots. Use the velocity numbers in addition to the target, not in place of.
