Barrel break-in with .263 bullets in a .264 barrel

jonh172

jonh172

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I'm in the process of aquiring a Shilen barrel in 260Rem, and for fire forming and barrel break-in purposes I picked up a cheap box of Speer 120gr bullets.
Upon further inspection, the box states the bullets are .263" in diameter. I know a thou. is really negligable, but I'm curious if this thou. will hinder my break in at all....or possibly aide in it for reasons of less friction.....? Then use .264's later......? Of course I only want what's best for my barrel life and accuracy so any info will be appreciated!

Thanks in advance!!
 
It should not be a problem. The only part of the barrel that will break in is the freshly cut throat and it should only take about 10 shots or so...
 
jonh172 said:
I'm in the process of aquiring a Shilen barrel in 260Rem, and for fire forming and barrel break-in purposes I picked up a cheap box of Speer 120gr bullets.
Upon further inspection, the box states the bullets are .263" in diameter. I know a thou. is really negligable, but I'm curious if this thou. will hinder my break in at all....or possibly aide in it for reasons of less friction.....? Then use .264's later......? Of course I only want what's best for my barrel life and accuracy so any info will be appreciated!

Thanks in advance!!
Click to expand...

50,000 PSI bumps the bullet up to bore diameter anyway. The lead core is somewhat plastic.

NormB
 
Why do you feel you need to break it in? They don't need it, and it is an unproven ritual. Save your precious accurate barrel life for something that counts!
 
Agree with Obtuned. Pounds of powder and improper cleaning kill a barrel. Choose wisely your course of action. It appears to be from my research that this is a rat hole for some and epiphany for others dependant on the type of shooting and what you are trying to achieve. It appears from my experience with hunting barrels that break in may improve the ability clean the rifle. On a precision barrel, yet to be challenged by me, do not mess with the crown and dont let the carbon ring in the throat get you comes across many times. Shoot and enjoy, and clean when accuriacy deteriorates seems to be a theme approached by some experienced shooters.

My two bits anyway.
 
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