The pressures aren't a problem for the barrel as the original barrel blanks for the 22 were also opened for the 32 and the 357mag. They did the same for the Lg/Supermag barrels, the 357Max, 44, and 445 all used the same size barrel blanks. Because of that the 357SM actually weighed slightly more than the 445 and Monson offered a IHSMA barrel that had a reduced diameter to make wt. for competition. My #%&SM came with one of those barrels and a standard size for the spare. The factory only had to order 2 sizes of barrel stock.