Not all subs are created equal.
I had a lot of issues with the 42gr Winchester subs not expanding, basically just performing like solids.
Ive sinced moved to Eley 38gr subs, considerably more accurate and never had an issue with them not expanding.
The Winchesters would pass straight through a possum and ricochet off the tree behind, the Eleys expand nicely even on myna birds.
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