I appreciate the reply. I tried the old style version of those, and got consistent 5" groups out of them. I have not tried the newer style, however. My best accuracy has been with a 270gr Speer BTSP so far, followed closely by the 260gr accubond. The accubonds are a bit tougher to accelerate just because they're a bit bullet due to the tip, I hit case capacity earlier.
My worry with the all coppers like the TSX, as others have said, is the lower velocity window. I'm starting in the 2400 range with those, which doesn't give me much room to play. But the subsonic varieties like the maker or Lehigh would likely work well. I do ponder though, if I'm going to shoot a 185 gr Lehigh, why did I go to all the work to make a .375 when I could have just stuck with a .308 shooting 180's?
Gday mark
The main thing the 375 really offers is the size of the meplat down
@low velocities
But shape of it is also important but I do somewhat agree that you can get some pills out of 30 cal to mirror or exceed the killing efficiency of the 375
Now going lighter again than that 185 LHD pill , hammer has a 137sh which worries me for you , yet put that pill in a situation of 3500 impacts plus & watch the wow factor over that 185 LHD ( that's from my mate as he used to use the 185 I've only used the 137SH with great results on correctly matched critter size) but keep away from medium to bigger critters or higher resistance critters as it will be found wanting better for lightweight light resistance
I would really look @ hawk bullets or maybe the fury as I did just recently as I was meant to test a new chambering that Is potentially going to hit the market from weatherby but that's gone for my own personal reasons & so be it as frees me up for life's greater goals
Anyway The flat point or round nose versions are terminally more efficient by design on the way they work & you can see this in a few different resistances & one that the critters react differently when hit with those styles of pills
Only issue is the speed of the pill they bleed off compared to a spritzer or like but these lower impact's @200/300 fps impact difference I'll take a round nose or flat point of good working ability over a spritzer or like every time
The issue I have I just haven't shot these so I'm theory based on this sorry
As for your current 270 gr btsp
It really works better with a little more speed & why I'd look @ a different pill & in the weights of 250 max personally I'd be honing in on the 220/230 weight ranges
Jm2cw & a little more food for thought
Ps I hate bears also as I've got no personal data on them only references /advice/discussion with some people I really rate as knowing their stuff so on a bear skull I'm fairly confident that even the 270 gr pill will get through
I do a lfair bit of testing on skull impacts on different critters along with angles & teeth impacts on those skull impacts as teeth offer a different world of what they do to a pill but I have trouble seeing bear teeth being a issue but once again I just don't know ( never asked that question to the ones I rate so my bad ) the impact angle is going to be the issue if it's one on a bear skull imo
Cheers