I would think the barrel itself is safe. Anyway I have no experience just my feeling. However, I do know that larger shot sometimes doesn't like tight consistriction and you may very well get tighter patterns with a modified or full choke. (if you deform the shot by "squezzing" it too hard you'll patterns will go to poo-poo)


DISCLAIMER!!!!!! If its a buffered buckshot load I wouldn't try it. Your pressures go way up when you add buffer to the shot column. I'd pattern it with a mod. and see if it gives satisfactory results, no need to overdo it. One shot should tell you if it'll work and that takes what, 10 minutes to setup and shoot?