re: Top a Springfield xdm 9mm for home pistol

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I think smaller caliber than 45 would be better to teach her w

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Although every action has an equal and opposite reaction, there is more to it than just a heavier bullet having more perceived recoil.

45 ACP is a very LOW pressure round. It was invented around 1911 when the pistol was designed and most things back then would not be able to withstand the pressures generated by 40 S&W.

40 S&W is a high pressure round. They simply took the 10mm Auto and chopped it down. They wanted to retain some of its ballistic characteristics so they continued to load it hot. This high pressure nature increases the slide speed and causes more "flip" from the slide. 357 Sig and 45 GAP are also high pressure rounds and will give the same perceived recoil.

Watch my video to see me get a little more in depth.

Caliber and Felt Recoil

EDIT: While all this is true, I still don't mind the round. My HD gun is my Beretta 96. Then again, I think the best 40 on the market is the M&P40 because it was built around the cartridge.