Back 12 or 15 years ago we had a similar discussion. A Sierra guy chimed in. He said that their boat-tail bullets did not have as thick sidewalls as the flat-base, and could be over-driven. "Over-driven" meaning too fast at impact (generally, close range) and would tend to blow up rather than do the controlled expansion thing. That fit with my experience over a number of years.
Regardless of the two blow ups, neither deer went anywhere. On one, the exit wound was fist-sized. The other was a neck shot. Both at about 25 yards. Basically, some 40 deer shot with Sierra bullets were bang-flops.
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