8300 PSI TOO MUCH FOR 10 GA TWIST

[J.B. Books]

I would think shooting a heavy load of buckshot would be infrequent once you find a load that patterns well. If it is one of Bell's listed loads he considered them to be within the acceptable range for their purposes of shooting composite barrels. Your gun sounds stout but you did not note the wall thickness at and just ahead of the chamber where the most pressure occurs. You asked for opinions here is mine, I would shoot an 8300 psi load through my 10ga NH but I prefer a lower pressure if possible in the 7000 range. I would also try 1 1/4 and 1 3/8 ounce loads and use whichever patterns the best.