How to clean barrel on Adaptive Target Rifle (TUBBGUN) 

David Tubb explains his barrel cleaning process. David uses Sweets and a one caliber oversized brass brush when cleaning.
For 6mm I use a .284 or .30 cal brass brush. For .30 cal I use a .32 or .33 cal brass brush. For 7mm I use a .30 cal brass brush. For .338 I use a .35 or .37cal brass brush. For .375 I use a .40 or .41cal brass brush.