Barrel problems 20P

[AWS]

I have a 20P barrel that is giving me fits. 20-30 shots and the throat carbons to the point bullets stick or get pushed back into the case. I've tried changing powder, bullets etc, with no luck. I'm thinking about renting a throater and seeing if the throat might be a little snug. I've had the barrel a few years.

Your thoughts.

 

[L.Sherm]

Whats your load? Powder?
Some powders burn really dirty running them slow.
I cant imagine carbon building up that bad without copper.
A throater isn't gonna do anything for throat dia, I run mine zero freebore with no issues

 

[Coyotefurharvester]

This area fouling is 1.brass short in chamber( run brass within 0.005 of chamber length).2. Metallics, plastic left in case while loading 3. Need a cleaner burning powder 4. High pressure loads.

 

[AWS]

Loads are 2230.and 748 under 40gr NBT and 39gr Speer, Rem 7 1/2 primer. Running my brass long to nearly fill the neck. I have a little carbine in 20P that shoots itty-bitty groups all day with no problems. The carbine barrel is a Criterion from Northland and the one that has me stumped is an X-calliber.

 

[L.Sherm]

What speed in the problem barrel? I shoot alot of 2230 in my 20P and easily shoot 200 rounds before cleaning.
Who chambered it?
Whos reamer?
Have you looked at the throat area with a borescope after its cleaned?

 

[AWS]

I run them near max. The bore.scope.shows.me.the.problem but not.the.solution. I clean the throat to.bare.metal.as.soon as it.starts.acting up. I have felt pads that is soak.in carbon remover and soften the carbon and spin a.bronze.brush to remove.

 

[L.Sherm]

What is Max? With what bullet?
How many gr of 2230?

 

[Coyotefurharvester]

Try a different solvent or at least a different flush out to see if some weird chemistry issues is the cause.