Originally Posted by Clark
So I would stick with the H4350.
The 270 even with wimpy loads is a real long range killer.
Wimpy is right when I read your guys' velocities. Not sure what's happening...maybe my chrono itself. But recently I've been seeing speeds about 50fps lower than the same recipes as before.
Note that this is a semi auto (BAR) so I think that limits the choice of powders vs. a bolt. (drive action reasonably etc.)
Anyway my 130gr TSX driven by 54.4gr H4350 is only going out at 2850 but shows promise in accuracy. That is only .6 gr under Barnes book max. I have flattened primers but case life is still good. But at that speed 500 yards is about the limit on deer (expansion vel of TSX & ft lbs). Strange that last year I chronod the same charge at 2900.
So my question is, what slower powder than H4350 would be good in a semi auto to boost the speed of a 130gr bullet? Or should I just move up in bullet wt if I want more punch at over 500 yards?
I have slower powders like IMR4831, some H1000, and some Rl25 but I in a RCBS or Hodgon manual that slow powders don' t do well in auto loaders.
(But wimpy or not, this load whacks deer and boar at a couple hundred yards.)