One unknowable variable in this entire equation that no one brings up is an individual gun's history. I hasten to think that a 100 yr. old gun has likely had any number of various rounds fired through it during its lifetime, from low pressure loads to magnums. If it hasn't failed by now, I doubt that shooting a slightly longer low pressure shell is going to all of a sudden make much of a difference. It may sound like I'm answering my own original question regarding this post, and perhaps I am.

Having said all that, and having read these fifteen pages of posts, it's still probably better to be safe than sorry. Why tempt fate?

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