You're worrying too much about powder charge. I load on a chargemaster where my throws are measured to the nearest tenth.
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6.5 Creedmoor
- Thread starter Sportin Wood
- Start date
Yup 
my Hornady auto charge pro best $300 ever spent, single digit sd everytime measured to the nearest tenth as well.
my Hornady auto charge pro best $300 ever spent, single digit sd everytime measured to the nearest tenth as well.
+-.02 grains basically represents, essentially, about +- 2 fps. I doubt that is your problem. We all want +-.001 but few of us would want to spend the money to get there. .001 grams is .015 grains.
With Varget 2 grains almost equals 100 fps. So .02 works out to almost 2 fps, which is negligible.
I will try to verify the numbers above, as that is just me doing a SWAG thing.
Verified the Varget swag.
For H4350 .1 grains works out to 7 fps. (GRT)
Although looking at hornady that suggests 50 fps for 1 grain or 5 fps for .1 grain.
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Do some online research... It seems a lot of people are getting their best groups in the 6.5CM with 140's in the +/- 44.0 grain range...This transferred to my own experiences. So, I'm really not that THAT overpressure based on general consensus. Primers are a little flat, but other than that, no issues at 45.0 in my particular rifles (which both have VERY concentric chambers to each other). One thing that might be helping me is that I'm seating the bullets 0.010" off the lands, so the base of the BT sits right about where the wall/shoulder junction is. So, I have minimal bearing surface in the neck, and minimal BT protruding into the case. And when I seat the bullets, they are not compressed loads. The groups speak for themselves, too. Also, if I was wildly overpressure, I doubt my ES and SD's would be consistent. My 22" barrel that load is producing an average of 4-5 SD, and 10 (or less) ES. I haven't shot the spiral-fluted barrel enough to get a consistent ES/SD number yet, but it was speeding up about 15-20 FPS towards the end of the first 25 rounds in that session, so it threw my ES/SD numbers off somewhat for the full 25 round shot string.Could you imagine how beyond max one would have to be to get 2,834 out of a 22” barrel with 140sunless Ive always missed something which is surely possible
And I saw on the Ultimate Reloader website that Gavin said 43.6gr shot best in his .25CM with 131 ACE's, and my rifle shoots best at 43.5gr with a 133 Elite. So, that data is tracking there, as well...
Seating longer reduces the pressure, all else being equal, for 2 reasons. One is more volume in the container, resulting in reduced powder/volume. Second could be, as you mentioned, less contact area in the neck resulting in less initial friction. Just have to make sure there is no jam going on which could result in higher pressures.
With hBn it mainly affects the neck friction and the friction through the barrel.
Physics being what it is, more powder results in higher pressure, all else being equal. No voodoo, no magic pixie dust. No “velocity nodes”, none of that.
There's 7,000 grains in a lb, so +- 0.02 grains is 1/140,000th of a lb.
From a significant figures point of view, it's well past nothing.
From a significant figures point of view, it's well past nothing.
Running Hornady match 140's out of 22.5" Research barrel using N540 averaging 2612 Fps. . With N560 hovering around 2700 Fps. give or take 3-4 Fps. Using StaBall 6.5 and Hornady 140 match runs them between 2735-2770 Fps. Accuracy using StaBall 6.5 is Best for Me staying under 2750 , however MY most accurate load comes from N560 and it's NO barn burner but accuracy is second to none .
Speed isn't everything ,yet velocity coupled with accuracy IS .
Speed isn't everything ,yet velocity coupled with accuracy IS .
