I have a 1988 Remington 1187 12 ga . For most of its 30 years I've shot it with the IC remchoke (stainless, I think). A few years ago I noticed a burr forming around the face of the muzzle of the choke tube (all the way around). Still shoots well but metal has definitely moved. Have shot everything from dove loads to steel waterfowl loads through that barrel. Will have to check it with a barrel mic against a new IC tube....... your post just reminded me of this....!
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