300 Blackout with the NOE HTC310-225 TACO CE4

[44Blam]

OH MAN!

I recently got a moratori arms upper with an 1:8" twist and a pistol gas system. I also have an SLR linear comp and am using a yellow springco spring.

I powder coated the TACO boolits and sized to .309 and it is my normal alloy that tends to be in the 15-16 BHN range. (Barrel slugs at .308 and I had issues feeding at .310.)

I did a quick ladder test with Alliant 2400 and WOW! It is a super fun round to shoot!

I had 5 charges ranging from 7 to 9 grain and the gun cycled even at 7 grain. The bolt locks back at charges above 8.5 grain. It is super quiet and has zero recoil.

Since I am just picking up 223 brass at the range to convert, it ends up costing about 8 cents / round (at prices I bought my stuff for).

One thing to note is that it is quiet enough that the Lab Radar had a hard time picking up shots, so I got between 3 and 5 readings / 5 rounds. But it chrono'd almost exactly where Quick Load indicated it would.

[BJK]

You can set the LabRadar to not trigger from sound. I haven't tried it myself but it's there in the manual.

Sounds good. I'm waiting on warm weather so that I can start to cast for my Blackout.

[44Blam]

One interesting thing, I had some feed issues with my Magpul 5.56 magazines. The little ribs that guide the smaller bullet were causing the tips of the boolits to cross each other.
So, I switched to my 350 legend mags and it fed with no issues. I have some metal 5.56 mags that do not have the little ribs - will have to see if those work.

[Iron369]

I’ve never had any issues feeding my taco rounds with p-mags. I use 20rounders for 300 blk and 30 for 223/556 to simplify my life. Message taco. He’s a good guy. Friendly. Always willing to talk about different loads. He might even make a video with your suggestions