I really want to make this my next project now, but I'm not set up for reloading-nor do I know anything about it. Are there any places that I could buy reloaded ammo off a vendor?
Yes theres a few trusted outfits that have 300blk reloads. Ozark ordnance is the first that comes to mind.
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Fun. And ammo has not always been so available.
To answer the OP's question..the difference between Winmag and Blackout is about 1800fps with 220gr bullets.
You can make a pistol gas barrel run subs without a can, I run a standard carbine buffer and it will run subs wothout the can on my 16" pistol gas noveske. I dont really see thepoint Iin doing that but it does work.
If youre not going to shoot subs then carbine is perfectly fine. Pistol gas really helps subsonic performance.