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M70, the front part of a Partition ALWAYS expands, at practically any range or velocity. But what happens then is what gets some people's eyebrows up: the bullet may lose a large amount of that front half. The lead just wipes off and the jacket peels back around the rear half of the bullet, leaving a small, almosy cylindrical slug. That small slug, however, usually goes right on through the deer.
That loss of the front is inevitable because if the lead is made soft enough to ALWAYS expand, it's not hard enough to hold together. It's a design tradeoff.
But when a hunter walks up and sees what seems to be a rather small exit wound, he thinks the bullet didn't expand at all (BTW, that's also why the same guys think Barnes bullets don't expand).
But they find that small exit on a DEAD deer!
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