I am in awe of you! You have done what I have been wanting to do only I only wanted to re-bore shot out 303 barrels to 357. I was thinking of using the feed to drive the rifling cutter at a different speed to the chuck so as to achieve the rifling twist desired. Anyway, I didn't get that far. But you have inspired me and given me some ideas.
Regarding the question of whether your barrel would be safe with factory loads, I would say absolutely.
Are you planning on shooting only naked cast bullets or do you have paper patching in mind? There are folks shooting paper patched 45-70's with stunning accuracy at ridiculous ranges. Think 800 yds with all ten shots in the centre of the gong. The centre is a bit bigger than a tennis ball but still. I'm guessing about a meter diameter, maybe smaller.
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