300 blackout load data...Lee 155

[STIHL]

Still that is getting down pretty low to stabilize that long bullet. Interesting though.

 

[fiver]

oh definitely.

the rifle is super light too, it was built to have a can put on it, and i ended up putting the heaviest muzzle brake on it i could find [yeah it's like having a brake on a 22...LOL]
but i needed the weight, i could see the trigger pull moving the gun over to the side slightly through the scope, and it's below 3 lbs.

 

[stlg67]

I have a lot of IMR 4227 and it works well in the 300BO.16 gr is where I started.
Jon

I was wondering what load did you end up with for thw best accuracy? I'm finally fixing to start loading some 160g powder coated Lee C309-160-R.

Thanks

 

[popper]

My 4227 load under 145gr GC is 15.7gr, could go some higher. Pretty much an inch @ 50. Cycled OK.

 

[stlg67]

Thanks I'll give that a try

 

[longhunter]

stlg67,
I tried loading down to 14gr of 4227 and worked up to 16 gr. It cycled the rifle and was accurate out to 200 yards. Using a 12 inch steel gong as my target. 16 gr was my end load.
Jon

 

[stlg67]

Thanks Jon for the information, I'll be trying these hopefully Tuesday and I'll let you know how they performed.

 

[stlg67]

I've loaded and tested the 160g bullet but was having some feed issues. I have OAL of 1.855 but I'm kinda of guessing. Most fed okay but had a couple jam. I was wondering what someone has had the best luck with on OAL.

 

[stlg67]

Thats that the Lee C309-160-R

 

[stlg67]

stlg67,
I tried loading down to 14gr of 4227 and worked up to 16 gr. It cycled the rifle and was accurate out to 200 yards. Using a 12 inch steel gong as my target. 16 gr was my end load.
Jon

I finally tried the bullets and with 160g, 16.2g 4227, they worked great. Using a pistol AR 300 blackout with 10.5" barrel, first shooting at 25yrds, will try maybe 50yrds next. Have two of the blackouts, these were build for home defense.