Here's the plan:
.30-06 cartridge as parent case, necked down to .243. Kinda like 240 Gibbs.
I have a 6mm-284 reamer I'd like to run into my 243 Win barrel about 2.500". This will create a chamber diameter of about 0.5042" at the breech face.
What will happen to the .30-06 case when I try to fireform it in this chamber, knowing the brass head diameter is a minimum of 0.4630" with a base OD of ~0.4968"? So we're talking of a diameter difference of 0.0412" at the rim and 0.0074" at the base.
Thanks for the expert advice,
jkpq45
.30-06 cartridge as parent case, necked down to .243. Kinda like 240 Gibbs.
I have a 6mm-284 reamer I'd like to run into my 243 Win barrel about 2.500". This will create a chamber diameter of about 0.5042" at the breech face.
What will happen to the .30-06 case when I try to fireform it in this chamber, knowing the brass head diameter is a minimum of 0.4630" with a base OD of ~0.4968"? So we're talking of a diameter difference of 0.0412" at the rim and 0.0074" at the base.
Thanks for the expert advice,
jkpq45