My Rock Island is from 1911 and I have no qualms about shooting service loads in it, let alone Trail Boss loads. As an aside, I believe the Army studied that issue long ago, including testing some low number rifles to destruction. The first one didn't let go until they fired a FIFTY PERCENT overload. They found the problem was substandard quality contracted wartime ammunition. Once they got rid of that, the problem went away. The Army only pulled the low number rifles out of service if they were sent back to the arsenal for repair. The Marine Corps never pulled them for any reason. It's up to you, but basically it was much ado about nothing.