"Chambering" Benchrest Air rifle barrels

[pbike257]

I have a couple 16mm barrels to fit to a few BR rifles. I'm getting things ready for the machining and I'm wondering what tools you guys that machine your own barrels for becnhrest shooting USARB or N50 use when "chambering", or setting up the breach end of the barrel blank. obviously we want the pellet to go in nicely and straight, and engage the rifling or polygon to some extent. I figure a slight round over and polish on the edge so as not to scrape the skirt or head as it enters the barrel. depending on pellet used there has to be a certain amount of "freebore" so to speak, and a "lead in" angle. What works best for you guys?

 

[nervoustrig]

These threads go into detail

Finishing A New Barrel Blank ?

I'd like to try my hand at finishing a new barrel blank. I understand concentricity, crowning and threading. Could some of you with hands on experience talk about the pellet chamber and lead in? I learn fast so share all you're willing. Do you leave freebore or try to start the projectile...

www.airgunnation.com

Selecting reamer size

Could someone explain me the process of selecting the reamer size for a barrel...my .223 shoot not so great n I imagine that the reamed opening is a few thousand big n the jump slightly deforms the bullet..the guy that did the barrel didn't use a reamer..the barrel is long so it could be cut...

www.airgunnation.com

 

[pbike257]

thank you there was some good reading there.