how tight to the grooves can I be?


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akolleth
March 16, 2008, 12:57 PM
How close to the actual groove diameter can you be with a bullet?

I slugged my 1938 Izzy Mosin 91/30 and got a reading of .312

Can I use a .311 jacketed bullet for reloading, or is that too tight? I imagine I can, but don't want to load it too tight and end up with a kaboom.

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jr45
March 16, 2008, 01:07 PM
Yes. You can use jacketed bullets at or below the grove size. I believe you can go .001 above grove and be fine...I have not tried it.

Walkalong
March 16, 2008, 01:57 PM
If you are confident in your measurements, .001 under with jacketed will shoot fine. :)

USSR
March 16, 2008, 02:02 PM
I shoot .309" Lapua D46 bullets all the time in my .308 FN SPR. No problem going .001" over in bullet size; going slightly under in bullet size is also ok, but accuracy may suffer.

Don

dmftoy1
March 16, 2008, 07:39 PM
If it slugged out at .312 then I wouldn't have any problems with a .313 jacketed. (if you could find one) or even a .314 cast. (I'd start with a .313 though. :) )

Sounds like a perfect candidate for the Hornady 150 Grain Spire points at .312 . .at least that's where I'd start if you don't cast your own.

Just my .02

Regards,
Dave

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