Given that you would be just starting out in IPSC, I don't think you need to worry about being too competative overall, you'll be learning a lot at first. What you need is a gun which will feel good while you shoot it, and by that I mean both the size/shape and the way the recoil/etc feels. If you like your .45, shoot .45; if you like your .40, shoot .40. If you like both equally well, then chose the cheaper/easier to find one (which, I guess, is .40 - I only shoot 9mm, so I can't offer any specific .40 vs .45 advice).
People who win matches win matches because they move fast, shoot well, are excellent at target acquisition, stage strategy, etc. The fact that .40 might cycle faster than a .45 MIGHT be ONE of the TINY factors, but I don't believe that it makes any real difference. They might simply 'like' the .40 recoil/etc better, and that would make a difference. For now, go with what works for you, and if you ever get into a situation where 0.5% of the score makes a difference, that's when you can start thinking about the gun's cycling time.
People who win matches win matches because they move fast, shoot well, are excellent at target acquisition, stage strategy, etc. The fact that .40 might cycle faster than a .45 MIGHT be ONE of the TINY factors, but I don't believe that it makes any real difference. They might simply 'like' the .40 recoil/etc better, and that would make a difference. For now, go with what works for you, and if you ever get into a situation where 0.5% of the score makes a difference, that's when you can start thinking about the gun's cycling time.
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