Been lurking for a while trying to pick up as much info as I can without asking a silly question... but can't seem to find out so here goes
I'm trying to work out reamer specs to make a .300/221 Rimmed out of .357 Max brass for use in a Martini Cadet rifle.
Now, I know that the .357 Max case has a head diameter of 0.379" vs the .221 Fireball's 0.376" so I want the larger head diameter to taper down to the .221 FB shoulder diameter of 0.361" and a shoulder angle of 23 deg.
Hopefully I can then use standard Redding .300/221 dies to create the brass out of trimmed .357 Max cases.
The PT&G reamer print I have been given is supposedly for a .300/221 Rimmed but differs in several (I think) important ways:
Shoulder dia is 0.3676"
Shoulder angle is 21 deg
Neck length 0.282"
Overall length from where rim meets body to end of neck is 1.340" (rim should be 0.60")
Leade (freebore) is 0.60"
I don't think this reamer has enough body taper for the Martini Cadet, which often has problems extracting fairly straight cases... even the .222 Rimmed in a Martini can stick with stout loads.
I'd like to specify the case tapers from 0.3776" to 0.361" with at least 0.10" freebore. I'd like to change the shoulder angle to 23 deg so the neck length will increase a bit to support heavy bullets.
Really appreciate any comments members may have on suitable reamer specs for a .300/221 Rimmed based on the .357 Max case... thanks
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