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Message: <blockquote data-quote="Cold Smoke" data-source="post: 3992646" data-attributes="member: 44374">I’m sitting here cogitating on all the responses which I appreciate immensely. I’m sweating details which really don’t matter. It reminds me of when I was building turbines years ago. When we started final alignment it was all done two hours after dark and would cease as soon as the first ray of sunlight landed on any part of the assembly. Of course all of our sag and operating thermal effects were calculated in by guys with two pocket protectors. A guy can get all wound around the tolerance axle on the front side and it all flies out the window after the first rapid fire magazine. Probably time better spent for bore uniformity and surface finish. At least try to induce some level of uniformity in the bullets shuddering from the chamber to the muzzle.It would be interesting to bore gage a barrel every 25 degrees F to see what happens. I suspect it gets tighter the hotter it gets. That and the granular structure probably expands like one of those pooping dog fireworks. <img class="smilie smilie--emoji" loading="lazy" alt="🤔" title="🤔" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" /></blockquote>