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I have a couple of 444's with the ballard barrels. I can not chamber rounds loaded with 429421 bullets. Some of my home swaged 240 jhp's also will not chamber unless seated deep and crimped over the ogive. Does anyone know what the maximum COL is for these rifles? Or do I have to do a cerro casting of the chamber and measure it to be sure? If a gunsmith was to lengthen the throat so these pistol bullets could be loaded and crimped in the crimp grove what would they be doing to the chamber? Is it the same thing as cutting a "Taylor throat" in a revolver barrel? What I am asking is: are they using a reamer with a one or one and a half degree taper to cut a Lead into the chamber that smooths the transition from chamber to the lands and by doing so gives more room in the chamber for a longer col? Just trying to understand what is taking place in such a process.
 

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You might try the 444 forum - Flat Top did alot of work with over all length in his build-ups, and he posts there often.
 
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