I've been in load development as well. With Berger 130vld and Hornady 140gr. With the berger I'm using nosler brass,with the hornady I'm using necked down 308 lc brass. Both loads are with imr 4350. the bergers seem to do well @ 40.5gr going 2750 .005 off the lands. I've loaded up some more that will be jammed .010 into the lands. Tried it before, need to verify again with a 10 shot grouping.
The 140g hornadys seem to like 41gr with the lc brass. In tthe process of working on different oal on those. They've proven to be a pain in the ass.
I found the bergers on sale at midway.
For me? I've found pushing the pill faster has proven to be unsuccessful with imr 4350.
I may be wrong b u t maybe lighter charge weights will bring your groupings closer
All brass is fire formed,collet.
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