I’m going to back it down to 68 grns of H4831 and use that for the maximum. 66.8 grns is listed on the Quick Load print out I have for 60K PSI. 70 grns just breaks the 3000 fps barrier on my chrono. I’ve got some 7828 I’m gonna try next. I’m just confused about the ejector marks vs the appearance of the primers.
The Quick Load print out shows 66.8 grns at 3044 fps (near max) and I never got mine that high. 67 grns barely makes 2900 fps in mine.
At work we had a statistics dept. to design and analyze experiments. It's difficult to account for cause and effect for 5 variables let alone 15+ in Quick Load. Your about 6 grs over max in reloading manuals even through your getting 3000 fps which matches manuals with much less powder. I don't trust QL I always go by manuals and not some computer questimate with a huge number of variables. Of course manuals may be a little conservative we don't know how they determine the max cut off point. The only thing that can sqeeze the case head into ejector hole is pressure.
You are at 66.8 t0 70.0 grains!!!
Per my Sierra reload manual:
154 gr bullet with 4831 has 61.9 grs max load at 3000 fps.
160 gr bullet with 4831 SC 63.6 grs max load at 3000 fps.
Berger manual:
140 gr bullet 62.0 gr max load with 4831 at 3086 fps.
168 Gr bullet 59.4 grs max load at 2887 fps