Lee 309-150 F in 300blk

[rtyler8140]

I'm trying to do some testing with the Lee 309-150 F in my 300blk AR. 16" barrel, pistol length gas 1:7. I'm running H110. Boolits are gc & powder coated. Trying to determine what I should be using for COL. Any input would be appreciated.

[SwissShooter]

It has to fit in the magazine and chamber. Trial and error as throats are different.

[Texas by God]

This way runs great and shoots so-so at 40 yards for me. The C309113F has less shank in the boiler room but doesn't shoot any better IME with my 7" twist Anderson barrel. YMMV.https://uploads.tapatalk-cdn.com/20200410/889d42d780697dbf2e5dcae7df077c36.jpg

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[rtyler8140]

This way runs great and shoots so-so at 40 yards for me. The C309113F has less shank in the boiler room but doesn't shoot any better IME with my 7" twist Anderson barrel. YMMV.https://uploads.tapatalk-cdn.com/20200410/889d42d780697dbf2e5dcae7df077c36.jpg

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Out of curiosity, what are you running for powder & how many grains?

[Texas by God]

Rtyler8140, I have tried these three loads only- before I moved on to other projects. Frankly I wasn't getting the accuracy I wanted with cast. Jacketed of all weights shoot great. Cest la vie.
15.5 grs of H110/W296
19 grs of Acc1680
14.5 grs of Lil Gun
PC'd or TL C309150F sized .309"

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[rtyler8140]

Rtyler8140, I have tried these three loads only- before I moved on to other projects. Frankly I wasn't getting the accuracy I wanted with cast. Jacketed of all weights shoot great. Cest la vie.
15.5 grs of H110/W296
19 grs of Acc1680
14.5 grs of Lil Gun
PC'd or TL C309150F sized .309"

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Thanks for the info. I have a few different loads of H110 to try, but was concerned with pressure. Seeing your COL and h110 charge put my mind at ease.

[Texas by God]

These loads are mid range for jacketed 150 gr bullets from Hornady’s manual. I’m loading BO’s this weekend and I just may try one more time.....
Edit: I tried slowing them down and it didn't help. This is from bags at 25 yards. The targdot is 1". The full velocity loads shoot about the same. If I ever build another .300 Blackout it will be with a 10" twist.https://uploads.tapatalk-cdn.com/20200414/554c88c2eba94748c6adf6cce9ef37c9.jpg

[rtyler8140]

These loads are mid range for jacketed 150 gr bullets from Hornady’s manual. I’m loading BO’s this weekend and I just may try one more time.....

I ended up doing 15.0g-15.8g in increments of .2g @ 1.920. Hopefully I can test them out soon.