I have a 642 that says on the barrel it is rated for +P ammo. Check your gun and the literature that came with it. If it has been rated for +P it'll say, if the literature or gun doesn't say +P then it hasn't been rated by the manufacturer for that ammo.
That being said your gun may be...
S & W 22-4 M1917 45 acp 5 1/2" BBL 250 gr RNFP cast @ 935 fps
or
Ruger Blackhawk 4 5/8" BBL 45 colt 250 gr RNFP cast @ 935 fps
Why? Have only fired revolvers for the past 50 years or so (I'll only admit to the 50 years, no more!!)
Steve
I know the OAL of the 45 AR is listed as 1.275". I want to load some 250 gr flat nose lead bullets with 6.0 gr of Unique.
I find if I use the crimping groove in the bullet the OAL of the cartridge is 1.225.
Will I be running into a pressure problem here due to the reduced volume in the...
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