Looking For a Contender Pistol 1:8 300/221 Barrel

[Garrett]

Originally Posted by TapTheForwardAssist

Is ".300W" marked brass .221-based then? Am I going to get killed on brass prices in the long-term if I get the .221 chamber vice .223, or is it much of a muchness for quality brass?

I suspect CorBon's brass was made by Starline specifically as .300 Whisper brass (hence the headstamp). When making brass you can use either .221 or .223 brass.

Or you can buy pre-formed brass from people here or on gunbroker.