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311 vs 312 for the 303
Hi all,
I'm trying to figure out why some shops tell you to use the 312 cal projectile, and others push the 311's... I have a minty barrel, so I'm wondering if I should stay away from the 312's.
Any thoughts on this?
Thanks!!
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09-29-2009 11:29 AM
# ADS
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Slug your bore. If it is .311 you can shoot a .311 or .312 but reduce powder and work back up if you go with .312 You will find that if you have a .311 and use .311 boattails you may get blow by and loose some accuracy. I have a unissued 1955 Faza and it loves the .312s and 4064 If you have a 5 land 5 grove barrel you will have to use a V caliper to measure your slug from the bore.
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use either interchangeably
as long as you are 10% below maximum loads, it makes no difference. I would INTENTIONALLY shoot the larger bullets first as they would probably tend to shoot better.
I also agree that 4895 is the best "first choice" in .303.
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Thank You to AKA Hugh Uno For This Useful Post:
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There is a good chance your barrel may be as large as .314 to .317.
If so .312 is still under size.
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