Issues related to this topic have been discussed on another thread:
http://www.accurateshooter.com/forum/index.php/topic,3763748.0.html
My 6mmBR has a 31 Kreiger Heavy Palma barrel on it and it has given me outstanding accuracy with loads up to 30.5 grains of N540 shooting 3 F-Class matches per day between cleanings.
I have heard this issue raised more often with some of the hot 7mm Magnums in string fire matches even with straight 1.250 cylinder barrels but some of them are running up to 71 grains of powder. I shot a 30 round test string with a 7mmBooBoo loaded with over 71 grains of powder and a 180 grain bullet going over 3100 fps through a 30 inch Heavy Varmint barrel with no problems. I doubt that the risk of failure is high enough with a 6BRX that chambering a barrel to test the idea would be a waste of money.
http://www.accurateshooter.com/forum/index.php/topic,3763748.0.html
My 6mmBR has a 31 Kreiger Heavy Palma barrel on it and it has given me outstanding accuracy with loads up to 30.5 grains of N540 shooting 3 F-Class matches per day between cleanings.
I have heard this issue raised more often with some of the hot 7mm Magnums in string fire matches even with straight 1.250 cylinder barrels but some of them are running up to 71 grains of powder. I shot a 30 round test string with a 7mmBooBoo loaded with over 71 grains of powder and a 180 grain bullet going over 3100 fps through a 30 inch Heavy Varmint barrel with no problems. I doubt that the risk of failure is high enough with a 6BRX that chambering a barrel to test the idea would be a waste of money.