Ok so here goes. If your using a big heavy projectile at 170 yards or at 10 yards or at 500 yards.its NOT the velocity it hits at that makes it expand so much as what it hits. You said behind shoulder and it pencils through.so you did not meet enough resistance. Like shooting a rabbit with fmj. Nothing to make projectile do anything but keep going. You have a number of choices and this goes for ANY cartridge and calibre. To make it withstand high velocity it has to be hard.hard doesn't expand well unless hits something hard enough to make it deform. Slow it down and it's worse..smaller powder charge,longer distance. Flipped on head a soft expandy or even varmit projectile at high speed is prone to blowing up,ripping itself apart.its what the supposed to do.so you NEED to aim accordingly.wound won't be deep, so have to find soft or shallow target, the crease,tight in behind shoulder is a soft target except on boars. The neck is also a soft target except on rutting stags. Your 300wsm will smash that tahr into pile of jelly if you can take out his front wheels.eg smash shoulder bones.move your aim forwards.if you go too far forwards you smash neck=good ,slightly rearwards, is what you have now,dead but can still move. If you change to a softer projectile you will drop animal alright BUT will do shit loads of meat damage and will be risking it on up close high velocity shoulder shots...where your heavy will get away with it the lighter one may not.200 grns of tiny bits of lead is still 200grns.
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