I have read a lot here on cheap shells causing problems.I bought a box of #9 Win AA's in 20 ga in 2001.Nine rounds of these would not go into the magazine because the rims were either oversize or out of round.The gun is an Ithaca 37 made in 1942.The other 16 shells in the box worked fine,has anybody else ever ran across shells that would not go in the magazine?