147 gr. 300 Blackout load data

[comm2679]

I'm setting up to start loading 300 Blackout. I've seen a few posts and videos on using pulled 147 gr. M80 ball projectiles with about 16.5 gr. of H-110 as a supersonic loading. I was at Cabelas flipping through several reloading manuals and could not find 147 gr. load data. My Hornady 10th edition manual doesn't include it either. I was wondering if anyone here is using this projectile to load 300 Blackout with success. Any feedback is appreciated. Thanks!

 

[papa6x]

My book doesn't have any data on it either, but a good place to find some info on the 300 blk is 300blktalk.com lots to learn there.

 

[Broom_jm]

Just use data for any pointed 150gr bullet...start low and work your way up.

NOTE - Since H-110 does not like low load densities, be sure to work from published data and do not go lower than the minimum listed.

 

[cosmos556]

I used some M-80 pull downs I bought cheap and I think it was around 17 grains H110. Cycled fine as I recall. I read a bunch of threads on it online to establish a rough range, cross referenced as noted above, and single loaded to take time and inspect chrono and fired brass. I don’t remember any flattening or other signs.

YMMV. Proceed at your own risk of course.

 

[comm2679]

Thanks for the help everyone. My case trimming jig will be arriving this week. I'll load some up and report back!

 

[Sniper 79]

I loaded some 150 grn game kings over 4227

May try Sierra data

 

[comm2679]

I loaded up my first 100 rounds of 300 Blackout yesterday. I converted a pile of twice fired 5.56 cases into 300 Blk. Final case lengths were 1.362-1.363. Staying within the powder charge parameters of my Hornady manual, I loaded 10 samples each with 12.5 gn, 13 gn, 13.5 gn, 14 gn, 14.5 gn, 15 gn, and 15.5 gn. I also loaded 10 each of 16 gn, 16.5 gn and 17 gn based on several recommendations for loads in this range. I seated my M-80 pulled 147 gn bullets to a COL between 2.135 and 2.145 (to the cannalure) and lightly crimped them. The biggest headache was seating the bullets. They were very inconsistent, sometimes having .020 variation in their ogives. I was hoping to have my final COL's to +\- .002 but that was more than these projectiles allow without adjusting the die for every round.

I did not end up firing the 16.5 or 17 gn loads because the 16 gn loads showed primers beginning to flatten. All 80 rounds I fired functioned 100% in my 9" BCM pistol with H3 buffer and standard carbine spring. I shot eight 10 round groups. My best grouping was with the 14.5 gn loading. My Hornady manual indicates about 1700 fps with a similar load from a 16" barrel. I do not have a chronograph so I can't comment on my velocities. However, 14.5 gn will probably end up being my range load. According to the Hornady manual it is a mid-range loading for the 150 gn class of bullets. This should be a good balance considering cost, power, brass life and wear on the weapon.

 

[calvin1911]

The Hodgdon website has the 150 grain Hornady Interlock bullet starting at 14.6 grains and max at 17.2 grains. Pressure and C.O.L. are on the website.