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M-44 tend to have rather largish bores like .312". If you cast bullets you could get by with it by having a slightly oversize mold made. But first, have your barrel slugged to determine the exact bore.
Indeed, you're absolutely right. Customers sending me slugs from their M44's vary in bore diameter from .310" to .3155" depending upon manufacure date and maker. These guns have the potential to shoot very, very well when bullets are sized to fit the gun. Too, as a general rule these rifles, as do many military arms, have HUGE throats in them, both in length and diameter, so typically, loading bullets to fit the throats of the chamber tend to tighten groups considerably. Although you might have a barrel with a .311" groove diameter, but having a throat of .314" diameter, choose to fill the throat if shooting cast bullets, and the gun will perform much better than when using a bullet simply at groove dimensions. You won't spike pressures, and the bullet won't tip or cock in the throat before entering the lands, but will instead enter straight and true to the axis of the bore, thus ensure a bullet that's concentric to the bore every time you light-off a load.

Too, if you have a dark, or somewhat rough bore, a few fire-lapping rounds down the bore will do wonders to slick things up, and make an otherwise cantankerous barrel behave properly!

God Bless,
 
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