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Quote: Precisely same requested dimensions, I have the Ruger No.1 in the 3" Jeffery (.410" groove) as well as my Cogswell & Harrison CERTUS in .450/.400 3 1/4" (.411" groove). That gas check bullet will work fine in either rifle at "factory" speeds with wheel weight alloy, gas check, and LBT Blue lube As an aside; Save yourself the aggravation of modding the .410 sizer die …... S&S Firearms: https://www.ssfirearms.com/proddetail.asp?prod=SA450 will make you a .411" (or any other size) Lyman/RCBS type die for little more than what you would pay to get a die and then have to mess with it. I have a couple of their sizers for my BP Express .577's (varied groove dimensions) and they are perfect. You would never know they were not factory OEM. - Mike |