300 Blackout Finished

[MED]

My 300 BLK pistol is my favorite thing ever. Accurate 5744 with 150 grain @ 2000 fps is my load.

Have you used this load with the surplus M80 147s? ...which projectile do you use?

I am still trying to figure out what I want in terms of loads. I am going to try the Lucky13 polymer coated 123gr with 16.8 of IMR4227 (should keep the velocity down). If this load works, it keeps my cost down to $3.25 a box. I have five hundred Speer 125gr TNTs to try as well along with three pounds of H110. I haven't picked up any heavy bullets yet for subsonics, but I have four pounds of AA1680.

I have another 300 rifle build in process with the Mag Tactical lower and 16" barrel.

[Artema]

Have you used this load with the surplus M80 147s? ...which projectile do you use?

I am still trying to figure out what I want in terms of loads. I am going to try the Lucky13 polymer coated 123gr with 16.8 of IMR4227 (should keep the velocity down). If this load works, it keeps my cost down to $3.25 a box. I have five hundred Speer 125gr TNTs to try as well along with three pounds of H110. I haven't picked up any heavy bullets yet for subsonics, but I have four pounds of AA1680.

I haven't done 147, but I'd be confident doing the load in that. I'm still burning through my batch of 150 grain M80, but have Hornady of the same style being loaded next. I don't anticipate much flight difference between the two.

Why is everyone in this thread running supersonic rounds? Where this round shines (and what it was designed for) is in a short barrel, subsonic suppressed setup. If it wasn't for that use I doubt I would even have a 300BLK caliber setup.

I shoot supersonic rounds because I wanted something bigger than my 10mm 1911 with more power without being as big as a carbine. 5.56 is a crappy round for any purpose I wanted (powder burns fully in a 20" barrel), and I don't really shoot past 400-500 yards. I also have old standard capacity magazines for 5.56, which wont load 6.8, 6.5, etc. 300 Blackout in supersonic is an obvious choice.