Just thought I would throw some more data to consider. IN MY RIFLE, with RL16 42.3gr, Hornady brass, S&B primers, and 147 ELDMs.I hit the lands at a coal of ~2.909, max magazine is 2.880.2.800 = 2682fps, SD 6.0, ES 192.830 = 2688fps, SD 4.1, ES 162.850 = 2696fps, SD 4.2, ES 132.860 = 2691fps, SD 5.9, ES 202.870 = 2708fps, SD 7.6, ES 312.890 = 2721fps, SD 7.2, ES 24 The 2.860 proved to be the most consistently accurate coal. They were all 5 shot groups and I was rather surprised by the increase in velocity, as I was going on the assumption (you know what they say about that) that a longer oal would decrease the initial pressure spike (as long as you we not jammed into the lands of course) and thus the velocity.
Only time I jam is when I'm fireforming Dasher blue box brass. My match load for said same is .018 off the lands. Consistent laser with Berger 105 Hybrids.
My 6mm BR prefers that everything be jammed ~.010"...105's or 107's all like to be jammed.
huh - now thats pretty interesting. thanks for putting some data to it! how long is your barrel? did you shoot them in that order going longer? could speed increase be attributed to change in barrel temp or having started with a clean barrel getting progressively more fouled?at 43.8gr i'm running them quite a bit hotter than you are (2785-2805 depending on temp) mostly because i couldn't find anything i thought was really good in the 42.x range. next load down that shot well for me was down between 2600 and 2625 which is actually slower than factory loads. maybe i wasn't looking hard enough in the 42.xgr range but since 43.8 seems to be working ok without issues even at 100F out, i'll stick with it for now.
My AR has a 24" Criterion barrel + suppressor.The barrel / suppressor never got above comfortably warm. I would take a short break between 5 round groups just to keep the temperature in control.I did fire them short -> long.
getting a bit off topic but can i ask what resolution +-.1gr or +-.02gr you're weighing your charges? ES under 20 is pretty impressive
While I would see an occasional sub 10 SD using the Chargemaster alone, it wasn't consistent enough for my ocd, with my current process is definitely more consistent and repeatable.
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