5.56 Water Expansion Testing; 55/70gr GMX, 62gr TBBC, 55/64/75gr GDSP
Quote:
Originally Posted by
WS6
Velocity IS a wounding mechanism at 1800+. It contributes greatly to secondary projectiles as well. As a matter of fact, this doe (shot with 70gr gmx by me at 78m) had secondary projectiles all through the top 3" of her lungs from her spinal column. Further, expanded bullet shape, etc. Does matter. A large flat meplat will destroy tissue more than a rounded one. Especially at the latter portion of the wound tract. My ra556b at 27m (pix on harddrive, not phone) produced significantly less damage than my 70gr gmx at 23m, from a shorter (14.5 vs 16.1) barrel on the exit side. Very interesting about bullet shape, weight, etc.. the wounds look like they cam from different caliber weapons, and you can see the value of retaining velocity through the target. Lots of blood trail on the 70gmx, none really on ra556b.
Attachment 54678
Attachment 54679
Vicious, I'm tracking.
WS6, THAT is what I experienced with the 70gr GMX even from my SBR. Granted, I bought almost all my 70gr GMX at one time, early in their initial release. But, I see explosive wound tracks with the occasional punctuate entrance, always a silver dollar or bigger exit, and always guts and blood and organs blown out of the backside of the animal. Blood trail is always strong, even when I tagged a 285lb boar through both cartilage plates and both scapulas at about 40m. Frankly, that didn't look much different from my Tikka T3 shot at 70m on a 240lb sow with 308 Winny 165gr Federal Trophy Bonded Tip (a TBBC with a boat tail and ballistic tip). Effects on the animal were the same; a quick dirt nap and some squiggling in place.... which quickly ended.
Granted I'm not equating the two calibers. Not hardly (I just spent serious coin building my own AR10). But the effects I'm seeing from the 70gr GMX are slightly better than with the 55gr Superformance GMX and the 62gr TBBC (neither of which would I hesitate to use for hunting or SD/HD). The farm I used to hunt at mistook my hogs for hogs my buddy shot with his Romanian AKM clone using 7.62x39 Wolf soft point and Hornady soft point on more than one occasion while they got started dressing the carcasses from the truck beds.
The guides who occasionally came out to hunt/spot with me commented that, when fired from my 11.5" suppressed SBR, the 70gr GMX created an audible "thump"/thwack that made them think it was a 7.62 AK round or a 6.8. Purely anecdotal. But they are all seasoned guides and not prone to praise. More like merciless mockery on a constant basis.
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