Around here, its annual quailfing time and that means practice at the range. I'm a brass whore! I go and pick up brass at least twice a week. Last couple of years, I could get a five gallon bucket or two of 40S&W, plus alot of nickle pieces when the LEOs did their night and duty ammo shoots. This year, I only got two coffee cans full. Its all 9mm or 45ACP. I'm seeing alot more 45GAP than 40S&W. Seems to be the next "new" thing.
Personally, I like a 45ACP or 45GAP over the 40S&W. The 45GAP in a 9mm size frame is not a hard on the weapon as the 40S&W loads. Plus, its alot less snappier.
Another personal "enlightenment", I noticed the 40S&W loads are getting hotter. This is causing ALOT of problems in the 9mm size frames. I don't know why they have to make the loads hotter, but I noticed alot more recoil and lower scores on my quailifing and others. And I shoot my 40S&W in some "bigger" weapons, like the Glock G35 and the XD40 Tactical.
Between the 9mm, 40S&W, 45GAP, and the 45ACP, I don't think you can go wrong with any of them. I like the 9mm for cheap practice (when I don't have a 22lr conversion kit) and the 45GAP for a normal size weapon and low recoil. Its just what you wnat. If you want a normal size weapon with the highest amount of rounds, then go with a 9mm. If you want a normal size weapon with a good amount of ammo and a larger caliber, you might want a 40S&W. If you want a larger size weapon with a proven caliber, when you have a 45ACP. If you want the best of it all, then you need the 45GAP
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Its the reason there is 31 favors!
Jerry