You guys are missing the point.
Forget expansion for sub loads on large animals. That's not going to happen with current large caliber technology; nor should it. Since you are dealing with low velocity/low energy loads,; if you design a super soft, expanding bullet it's not likely to exit and only create a caliber sized entrance hole that would likely be sealed with fat or other tissue not leaving a blood trail. Subs loads drop quickly and the difference of 10 yards beyond the first 100 can mean a drop of 2-3". The purpose of the SMKs is to have a high BC leading to flatter trajectory which gives you a decreased drop at longer distances and increasing your success rates at hitting a vital organ. Furthermore, while you can't get away from the small entrance hole, the HPBT's quickly deform and tumble in the body cavity exiting with a large, knife like wound, leaving a clean kill (assumung you didn't screw up the shot) and leave a blood trail.
If you want to shoot varmints with an expanding sub load you shouldn't have any problems and you are typically not worried about tracking/blood trails.
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