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Better sectional density, more 'power', more range of bullet choices and better mag capacity than .45 for a grip/pistol of the same size but gives up capacity to the 9mm. In short, a good compromise between 9mm and 10mm or .45 ACP. The recoil doesn't bother me at all, more controllable than a .45 ACP in similar pistols and .45 ACP while having more recoil, is still controllable for me, I just can't shoot it as fast.
I also think the .40 is better in the compact/sub-compact guns as it will remain more 'powerful' than the 9mm is in a full sized gun.
Most of my SIGs (except the 227) either have or will eventually have the capability to shoot both 9mm and .40
Anymore I buy a SIG in .40 and then get the conversion barrel for 9mm, it is cheaper and more convenient than getting them in 9mm and then having to buy the slide and barrel for .40
The one downside is that .40 is not as popular as 9mm, and with more and more LE orgs dropping .40 in favor of going back to 9mm, it is only going to get less popular. So I stock up on 9mm and if/when SHTF I will have more 9mm than .40, but depending on the situation, I would use the .40 first, then the 9mm.
I also think the .40 is better in the compact/sub-compact guns as it will remain more 'powerful' than the 9mm is in a full sized gun.
Most of my SIGs (except the 227) either have or will eventually have the capability to shoot both 9mm and .40
Anymore I buy a SIG in .40 and then get the conversion barrel for 9mm, it is cheaper and more convenient than getting them in 9mm and then having to buy the slide and barrel for .40
The one downside is that .40 is not as popular as 9mm, and with more and more LE orgs dropping .40 in favor of going back to 9mm, it is only going to get less popular. So I stock up on 9mm and if/when SHTF I will have more 9mm than .40, but depending on the situation, I would use the .40 first, then the 9mm.