In IDPA a 45 can be used in CDP and a 40 in ESP
In USPSA a 45 and 40 can be used in either Limited or Limited 10. If the 45 is a singlestack then you will end up shooting L-10. In general a 5" gun will give less resoil and will be easier to shoot. If you get a 5" 40 with a bushing barrell then it can be used in USPSA and IDPA.
I would go with the 40 since it is more versatile for both shooting sports. Dont get stuck in some mentality from the internet about one or the other sports. Try them and decide for yourself.
Remember that anything with a timer and scoresheet is a game.
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Gun control theory - A woman raped and strangled is morally superior to a woman with a smoking gun and a dead rapist at her feet.
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