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I have a feeling it would hold together better than the Keith #358429. Several years back, a friend wanted to try the Keith HP's out of a 6" Model 28 S&W. He took a doe high in the back at about 50 yards. The autopsy showed the nose folded open and sheered off in the first few inches, the remaining part continued on through. I decided then I'd not be using it for deer sized game. I have a feeling the Thompson #358156 would have held together much better.
I share this feeling. I do not have a 358156 or its clones, but I have MP's 359 Hammer in this weight range and with its small pin it holds together MUCH BETTER. The 429s nose walls are very thin. The 429HP is meant for jackrabbits (this is what Keith did with it) and stuff you want to just splat like a coyote or something. While its solid form is indeed an excellent penetrator, however, wont deliver the largest diameter wound. I would never use it for deer or to stun a pig.