I have had reliability issues with Kent 3 1/2"s. I attribute it to poor crimps. Out of one box of shells every crimp was different. Some were round, some were octagon shaped with sharp corners, some were actually flared. All in all they were sorry looking crimps. I like a crimp that is perfectly round and smooth. May be more forgiving in a pump but I could not recommend for an auto.

This may have been an isolated case but I can't trust them now.