GOB,
I was hoping someone else would field this, but, anyway here goes. I'm not 100% sure on this and I would hate to give you bad info.. Copper plated is not steel, so I can't imagine that it would effect your gun as far as bulging the barrel. I have shot it in my 870 wingmaster without any problems and it was made back in 70 or 72. More recently I have been shooting it in newer guns. Personally with my guns I wouldn't have a problem, I can't speak for yours. You are shooting a modified, I just don't see a problem unless you have a problem you are not aware of. Sorry I can't be of more help.
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Bird Dogs and Hunting
If you're betting against God, you better be right.
"When a dog dies they take a piece of your heart but leaves you a piece of his, and humans always make out in that deal. " Mark Twain.
Larry Miller
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