A little off track here, but am curious about the gas seal mentioned. I fired a 6.5 Arisaka in a 6.5x55 chamber. Not intentionally. Think about the length difference there. It had a very short neck and had formed to the chamber. I bet it had grown in length by over .200. The case was nice and clean when it came out. So, do you think the case has time to totally expand before the bullet is completely out of the case? It was an Arisaka action and the extractor held the case against the bolt face.
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