We use the FTX supers in supersonic in three calibres -357 , 7.62x39, and the dino gun .
They certainly do a number but the smaller rounds do not seem to penetrate very deep if they hit something solid . We have head shot both wild sheep and goats with the 357 at a range of around 10 meters (the goat between the eyes and sheep through the side) and neither round came out the other side, they appear to just explode on impact.
The dino gun not so much but being a heavier 325gr round must retain enough weight to keep on going .
We have also found in some calibres/rifles the accuracy is average to say the least . Our 30/30 didn't like them one bit, but 45/70 loves them.
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