The Firing Line Forums - View Single Post - Cartridge Resizing .223 to 300 Blackout/300 Whisper

velillen · April 9, 2013, 11:57 AM

My process for going from 223 to 300blk goes like this

1) cut case at neck of 223 (leaving next to no neck left) using a mini chop saw from harbor freight (30 bucks)

2) lube and size/deprime bases

3) trim to size using trimmer of choice (I use rcbs one)

After that its just normal prime, Bell mouth, seat bullet, crimp of desired.

I haven't annealed myself but know people who do. I do my processing in batches so do all cutting one night, then sizing the next, ect.

April 9, 2013, 11:57 AM	#3
velillen Member Join Date: October 20, 2012 Posts: 93	Re: Cartridge Resizing .223 to 300 Blackout/300 Whisper My process for going from 223 to 300blk goes like this 1) cut case at neck of 223 (leaving next to no neck left) using a mini chop saw from harbor freight (30 bucks) 2) lube and size/deprime bases 3) trim to size using trimmer of choice (I use rcbs one) After that its just normal prime, Bell mouth, seat bullet, crimp of desired. I haven't annealed myself but know people who do. I do my processing in batches so do all cutting one night, then sizing the next, ect.