I have, in over 18,000 rds of reloading 40S&W never trimmed a case. I don't even have the equipment to trim pistol cases. The low pressures make case stretch very minimal and in most incidents the case will split long before it needs trim. Rifle cases need trimmed pistol cases rarely do.
I'd say this is probably my 4th time reloading the brass I have now and I've never trimmed it. I remember when I realized that my first time reading and asked the same thing. Man was I relieved when I read you didn't really have to trip pistol brass, cause that saves a TON of time. But yeah, don't worry about it. Just load them up!
Actually there are some pistol calibers that may require periodic case trimming. If you reload a 357 sig, 9x25 Dillon or any other tapered cartridge you may need to trim the cases but usually not as often or as much as a rifle case.
I reload for 357 sig and 223 and will begin reloading the 10mm as well so that''s 2 out of 3 tapered cases. I'm also looking to pick up a 243 rifle and conversion barrels for my Glock 20 in 9X25 Dillon and if I do that will make 4 out of 5 with tapered cases.
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