On the 45ACP case the "normal" web thickness is 0.175" for 45 ACP, 0.182" for 45 ACP+P and 0.198 for 45ACP Super. That is a significant difference in strength IMHO. Unless you have a ramped barrel in your 1911, I'd recommend the +P and/or Super cases when you decide you want to "experiment" with over the top loads along with the use of heavier springs.
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