Originally Posted by zane243
Whats your deffinition of 'max charge'? I am at 44.5g of AR2209 (H4350) which is above the book max. I have tested to 46g with no issues in regard to pressure but accuracy seemed to be suffering. That being said, 46g was not the max capacity of my case and I suspect I could load up to around 48.5g based on cartige capacity before the loads become compressed. I didn't see any point going above 46g when the groups were increasing with charge, is that a rookie error? Is it possible that the groups could come back in as I approach a charge closer to the cartige capacity?
There is book max and there is cartridge max. I never exceed book max unless the case and action of the rifle are telling me everything is safe. I read primers, case head marks from the extractor, and bolt lift. I also chrono loads to see if speed increases or remains the same with increases in powder. On the other end of things I have had cases indicate book max is not achievable as I get pressure signs before I reach said max. For example, cratered primers, extractor marks, and sticky bolt lift. This is a NO GO area for me.
So if you are above max and not getting accuracy then my guess is you should back off as well and play with seating depth. .010 is nice place to start. My LR rifle likes .075 to .100 off the lands with Berger VLD Hunting bullets and 160 Matrix. It likes .010 to .015 with Match bullets, which have a shorter bearing surface. Just saying you never know what your rifle might like. Don't be affraid to jump that bullet though. You might be very surprised at the results. My 204 likes .100 as well. It shoots .15 MOA at .100 and .150 off. Crazy.