...or related cartridge. There are lots of cartridges that are related to the .223 that use the same sized bolt head. These range from the .17's (Rem, Mach IV, Fireball) to the .20's (Tactical, practical) the .22's (.222, .222 Mag, .221 Fireball), 6mm's (6x45, 6x47, 6mmTCU, 6 Whisper) 6.5mm's (6.5PCC (wildcat), 6.5TCU, 6.5 Whisper), 7mm's (7 TCU, 7 Ingram, 7 Whisper) .30's (Whisper/221/Fireball, AAC Blackout) and even .338 (.338-223 Straight).Originally Posted by Jamie
Several of those are fairly well established wildcats and load data and dies are pretty common.
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