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I've got a Merkel in 450/400 3" and while fairly plain, it regulates exceptionally well, and the bores when looked at with a borescope are two of the smoothest I've ever looked at, so much so, they may well be a bit too smooth, as it copper fouls quite badly. I'm currently trying HBN coated projectiles to see if I can alleviate some of the fouling issues.
DC
(I'm highjacking my own thead now) All my big bores (375H&H, 458WM and 500NE) copper foul badly to the point of calling it copper plating of the bores. I'm using only Woodleighs in the 458 and 500 and haven't used anything else - there anything about them that makes them more likely to foul?
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Re: Merkel doubling - fixed?