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HiBC · December 28, 2021, 01:06 AM

What measuring tool did you use and what is your process for checking its calibration?

I'd trust a good micrometer to declare ".356" If a pair of typical calipers said .356, I'd say its likely between .355 and .357.

I wouln't trust a new,calibrated Browne and Sharpe calipers to be a qualifying measurement of less than .0005. A coat of Magic Marker ink can go .0005

Jacketed bullets are more forgiving of being a little undersize. Cast bullets that are undersize at all allow gas jetting around the projectile. That heat cuts the bullet and lead sprays your bore. Cast bullets need to be bore size or slightly larger.

I just do not have enough experience with plated bullets to say much about them.

December 28, 2021, 01:06 AM	#4
HiBC Senior Member Join Date: November 13, 2006 Posts: 8,289	What measuring tool did you use and what is your process for checking its calibration? I'd trust a good micrometer to declare ".356" If a pair of typical calipers said .356, I'd say its likely between .355 and .357. I wouln't trust a new,calibrated Browne and Sharpe calipers to be a qualifying measurement of less than .0005. A coat of Magic Marker ink can go .0005 Jacketed bullets are more forgiving of being a little undersize. Cast bullets that are undersize at all allow gas jetting around the projectile. That heat cuts the bullet and lead sprays your bore. Cast bullets need to be bore size or slightly larger. I just do not have enough experience with plated bullets to say much about them.