Extreme Blackout, What are the limits and how do we explore them safely. update 7/1/18

[JBMauser]

dellet, your holy black load is interesting but I will pass now as I only have an AR in 300. Holy Black would not be very kind to that silly skinny tube that makes the AR go Bang!.. I am looking at the Ruger bolt gun in 300 AAC and I would break out the Goex for that but for now not so much.

[rebel]

I have an old box of Hornady 130's that I've messed with. Spire point, good profile. If you want I can send you some, didn't know how much you wanted to clean

I'm going down the LT-30 road right now, got to help with that if I can.

[dellet]

I have an old box of Hornady 130's that I've messed with. Spire point, good profile. If you want I can send you some, didn't know how much you wanted to clean

I'm going down the LT-30 road right now, got to help with that if I can.

I don't have much on that powder yet, I keep getting sidetracked. There is some info posted on the forum for heavy bullets that came from Accurate. 11.5-12.5 grains.

I found that 11 grains cycled everything I had on the shelf, everything above 150 grains stayed subsonic. 125's cycled, but I know velocity was high, about 1180 I think.

I seated everything as deep as I could, on the 125's I cut the brass to 1.350, and seated he bullet with the ogive about .010 above the neck. Just enough to hold a crimp.

Keep in mind this was a 18" barrel with a carbine length gas, non suppressed. It is probably the most forgiving powder I have worked with for subs, but it did seemed dirty and loud. I have not revisited with a pistol gas.

It will be good to get some solid data on it.

[rebel]

1680 with a bit of fill at 9 grains did not do squat. This was done at night, just farting around. I'll try to send some over a chrono soon to get some data. This was with a 130 COD bullet. Fill won't increase gas volume, just getting consistant ignition.

[dellet]

1680 with a bit of fill at 9 grains did not do squat. This was done at night, just farting around. I'll try to send some over a chrono soon to get some data. This was with a 130 COD bullet. Fill won't increase gas volume, just getting consistant ignition.

Was that the carbine or the sbr?

I'll see if I can get the 125's to lock back with a suppressor. If that works, maybe I could pull a couple of 120's and try, that would be a better comparison for 130 cast.

[rebel]

sbr unsupressed, as said just farting around.

[N2130N]

The blackpowder load was interesting! Any sub data?

The funnest thing I've done is load pulled M1 carbine tracers (M27) over 5 grains of trailboss. Its like a roman candle on steriods ! Out of my Micro 7 all you hear is the firing pin click & then you can actually hear the bullet "sizzle" as it flies away. Too much fun! I need to find more.

[kroeker]

I'm also trying to test the limits on the blackout. Once I get I get a chronograph I'm going to try a load for long range. Flat line bullets claim they're 155 gr palma bullet will run 125 gr speeds and has a BC of .533 so if my figuring is right that supersonic to 1000 yrds.

Lil gun or 1680 looks like a winner for speed and lapua now making brass means should be able to get good es numbers. Will be an expensive round at $1.25 a bullet but if I could keep sub moa out to 800 yrds it could be worth it.

[Dolomite_Supafly]

The single most important thing I do to brass for consistency sake is uniform, chamfer and deburr the flash holes of cases. I now consider it part of the process of making brass. It was responsible for helping my break into the .2" CTC groups sizes in a 223 bolt gun. Before I started doing this the best that rifle could muster was over twice that at 100 yards.

Having an accurate rifle is not just the rifle but what you feed it.

I spent years chasing groups. I finally quit when I realized I was spending way more time and money getting ready to shoot rather than actually shooting.

A long range 300 Blackout has been on my mind for some time now. I have 400-500 matched prepped cases waiting to be loaded.

[Dr.Phil]

The single most important thing I do to brass for consistency sake is uniform, chamfer and deburr the flash holes of cases. I now consider it part of the process of making brass.

I second this...
Through years of load develpment, I have discovered that this is the single best ROI when it comes to brass prep.