Home Forums Hunting & Shooting Gunsmithing Mark V trigger keeping bolt from releasing?

A new to me .300 Wby Mag has slim muzzle brake installed and trigger job -- some sort of after market. The rifle was only used for hunting (f-i-l did some load development for friend of his, the former owner.) While cleaning it up, I couldn't get the bolt out using the usual method, which works fine on the wife's .270 Wby Mag also a Mark V. Anyhow, I have had to clean from the muzzle braked end -- even taking it out of the stock yielded no answer as to how to clean from the breech with my usual routine. No matter how I manipulate the trigger, the bolt will not release. I don't plan to do much with the gun, but am curious about any learning opportunities you'd care to share.

Thanks!

Barry