Frosted bore

4 Scale · 08-18-2017, 10:23 AM

My theory is that corrosion ("frosting", "rust", etc.), adds nothing to the bore that can obstruct or alter the path of the projectile as rust is softer than the metal it formed on. Rust by definition is a transformation and a net subtraction in terms of mass.

Due to the length of the bullet in relation to the relatively small size of individual corrosion patches such as pits, the corrosion itself will not degrade the bullet path or its spin. For the same reason, even in poor bores, gas cannot escape enough to decrease bullet velocity.

Phrased differently, as long as you can see rifling it doesn't matter how worn and corroded the bore is, it will be accurate.

I wish there was a way to test or substantiate this theory. The fact is I cannot tell any accuracy difference between excellent and poor bores.

08-18-2017, 10:23 AM	#9
4 Scale User Join Date: Nov 2014 Posts: 544 Thanks: 194 Thanked 490 Times in 251 Posts	My theory is that corrosion ("frosting", "rust", etc.), adds nothing to the bore that can obstruct or alter the path of the projectile as rust is softer than the metal it formed on. Rust by definition is a transformation and a net subtraction in terms of mass. Due to the length of the bullet in relation to the relatively small size of individual corrosion patches such as pits, the corrosion itself will not degrade the bullet path or its spin. For the same reason, even in poor bores, gas cannot escape enough to decrease bullet velocity. Phrased differently, as long as you can see rifling it doesn't matter how worn and corroded the bore is, it will be accurate. I wish there was a way to test or substantiate this theory. The fact is I cannot tell any accuracy difference between excellent and poor bores. Last edited by 4 Scale; 08-18-2017 at 10:35 PM.