Hello,
I happened to find this thread with google. I've been reloading about two years now.
I did some load development with RS52 & 155gr Lapua Scenar, here are my results:
CZ550 .308Win Varmint, 520mm / ~20,5" (from breech to muzzle) stock CZ barrel with 1/12"twist, installed suppressor and shortened barrel from 660mm -> 520mm.
New Lapua Full-sized case, capacity 56,0gr H20 on fired case.
Magtech 9½ Large Rifle Primers
LOA 72,4mm / 2.850" Slightly touching lands.
Velocities does not make any sense when compared to Quickload predictions.
I got a primer cratering at 47,5gr. Also noticed few minor cratering on the lower loads here and there when I did some further inspection at home. No flattened primers, all look equally good, small stamps on the primers still visible. No stiff bolt lift. I've noticed that the bolt lift is always a little bit stiffer after firing compared to chambering a new round.
Best grouping was at 45,1gr and the velocity was pretty consistent too.
When analyzed my results at home, I got a bit confused because the velocities are far more than they should be, when compared with quickload. To get +850ms or 2800fps from short barrel like mine, the pressure should be over CIP Max. Maybe a "fast" barrel or excessive pressure, or both.
Any ideas? Tips?
Cheers!
