300BlkTalk

I picked a bad time to finish my 300 AR build just a few months ago. In a panic, I ordered 500 cases formed from mixed brass. Since I already had a batch of LC that I started my handloading with, I just now got around to prepping them, and, whoa, case lengths run the gamut from 1.348 to 1.364. Shoul...

Here's the link directly to the PDF.

https://reloading-data.speer-ammo.com/d ... ut_150.pdf

Anyone tried Speer's data for 150-grain bullets?

Their starting charge is 18.2 grains of LilGun, which is max in most other sources I've looked at. Their max is 20-grains compressed.

Sounds awfully hot to me.

Yep, Optics Planet has been great in my experience, but they don't make it very obvious when they're out of stock on something.

I installed the H2 buffer.

Now with the Remington 110 factory ammo, I get BHO.

Handloads of 14.5 grains IMR 4227 with a Speer 150 aren't even picking up the next round from the magazine.
That's a starting load, but, damn!

Update: When the Lee seat die started seating the Speer Hot-Cores crooked, I ordered an RCBS set with the small-base sizer. Now neck tension alone holds the bullet in place. The only downside has been a marked propensity for sticking in the size die. I had been using Hornady 1-shot and teflon powder...

So a 4.8 oz buffer would probably do the trick?

This buffer kit:

https://www.righttobear.com/Mil-Spec-Pi ... pistol.htm

Howdy. Just built my second AR, a 300 BO pistol, Faxon 7.5" Gunner profile barrel, Strike Industries Enhanced Low-Profile gas block. I'm not getting a lock on the last round. I've tried three different magazine types. The only ammo (as it's very hard to find) has been Remington 110 super and so...