Okay, let me straighten out something about .300 Whisper
I'm looking to build my first .300 here soon. I'm going to be building a midlength AR-15 in .300 whisper or fireball.
One of the things that I'm still a little confused about is forming the cases. Now, I understand you can buy a die set when essentially does forms the case. However, it seems SSK recommends to form from .221 - which for me doesn't make much sense - because the whole appeal of the cartridge is the cheapness - I can use .223 cases and .308 surplus projectiles - best of both worlds. I just want to straighten out that I CAN use .223 brass to form the .300 cases?
Also, as far as gas blocks, everyone recommends an adjustible gas block for the large and smaller projectiles and pressures. If I were to just install a basic gas block on a 16" .300 whisper barrel with a pistol gas block location, I would presume it would probably be best for subsonic rounds - would that be right? What's a reasonable but effective adjustable block you might recommend?
Thanks for everyone's time, I really appreciate it.
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