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And the captain of the titanic probably thought the same thing.
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That's not exactly an apt comparison. We're talking about a product that can be stress tested both virtually (with computer modeling) and physically (with proof loads) before it goes to market. Engineers can easily determine how much stress the top strap will have to endure and how much stress the materials they use can endure, and design firearms accordingly.
I wouldn't worry about it. As long as you are sticking to factory loaded or recommended loadings from published reloading manuals you should be fine. Going beyond that is asking for trouble, thin top strap or not.
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hat part of it being that thin concerns you the flame cutting or just the over all stress from heavy loads.
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Flame cutting will only occur at the front of the top strap by the forcing cone, and as such, isn't an issue.