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I don't pretend to understand the voodoo that goes on inside the barrel, but my 10-bore would only regulate with Swiss FFFg at 1300fps. I fired Blue Dot loads from 1100fps to 1450fps and they all cross horribly at 30 yards, as did all of the various Goex F, FFg, FFFg, and cartridge loads I tried. For whatever reason the swiss has the right pressure curve and recoil to make things work and the holes touch at 50, so while I sing the praises of Blue Dot it doesn't work for every gun.
Bob

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I believe you hit the nail on the spot. Lots of folks believes when it comes to doublerifles, its all about bulletweight and velocity, but the absorbtion of recoil into the gun also plays a major role. My 10bore loves 9 drams of 1.5F Swiss, but actually shoots okay with BD, to be acceptable within a 50 yard. I am going make up loads for a range session here this summer. I`LL post pictures of the results. I have yet to try .793cal roundballs in the gun. No question BD recoil much less:LOL.

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