300 blackout in a single shot rifle

[andym79]

Hi guys three questions:
1. Does anyone shoot 300 blackout in a single shot and if so, with what bullet, load and twist?

2. What accuracy is the 300 blackout capable of at 100 and 200 yards with 170-250 grain bullets?

What is the minimum twist you would recommend to stabilise big bullets whilst not hampering cast accuracy?

Thanks

[curator]

The .300 AAC "black-out" is designed to shoot .30 caliber bullets in the 5.56 AR platform. It has many more uses in a single-shot rifle, and can be loaded for sub-sonic, suppressed fire or something equal to the 7.65X37 Ak round pushing a 123 grain slug to abut 2200-2300 fps. I shoot the cartridge in a AR with 1 in 8" twist and find 2" -5-shot groups at 100 yards pretty typical with 125 grain jacketed slugs and 180 grain cast lead bullets. Shooting .310/235 Cast bullets at 200 yards I have had 2 1/2 inch groups using bullets cast from my LBT .235-310 SP-GC mouild and 11.5 grains of AA1680 powder. I have a T/C Encore that is rifled 1 in 7 inches wiht a 12 inch barrel. It will shoot the same load into 3" 5-shot groups at 200 yards from a sand=bag rest.

[Mk42gunner]

This is one of the times I would recommend a lot of figuring with the Greenhill formula, and deciding just what I wanted the new rifle to do, before I ever ordered the barrel.

Robert

[andym79]

This is one of the times I would recommend a lot of figuring with the Greenhill formula, and deciding just what I wanted the new rifle to do, before I ever ordered the barrel.

Robert

couldn't agree more, with such a range of bullet size its not a simple one!

Do I want to shot big slugs slow? Yes!

Do I want to shot medium slugs at moderate speeds? Yes!

Do I want to shot small slugs at moderate speeds? Yes!

Do I want to shot small slugs fast? No!

Do I want to find a load that gets the most in terms of accuracy regardless of size or speed? You bet you, always the number one goal.

[Sensai]

Why? In a single shot the 30-30 has better ballistics, has a better neck length for cast and can use pointy bullets/boolits if you want. In my opinion the rimmed cartridge is a better choice for single shots. Of course, there's the "Oh Wow, a new cartridge to try" factor to consider.;-)

[andym79]

Why? In a single shot the 30-30 has better ballistics, has a better neck length for cast and can use pointy bullets/boolits if you want. In my opinion the rimmed cartridge is a better choice for single shots. Of course, there's the "Oh Wow, a new cartridge to try" factor to consider.;-)

All completly true, but from what I understand cases as long as the 30-30, 32-40 etc a pain to load through the breech block of a cadet unless you breech seat! And I am not sure that I can be bothered with that!

If I had a martini enfield then it would become a 32-40, 38-55 or 30-40. But I don't, so I am looking for something that gives me more than a 32-20 or 310 cadet, but fits into a cadet.

My first thought was to make what I call for a development name at least the 32-30 a case of based on the 32-40 but 25% shorter, and necked up to 33, so a concept under development tentatively the 33-30.

Its been barrel availability with regard to twist rate and a huge selection of projectiles that has been pushing me towards 30 cal.

[MT Gianni]

I have a Handi rifle in 7.62x39 that shoots well. Something else to consider, I know some have shot 180 gr loads, no reason that would not work or even a heavy like blackout loads if it was throated for them.

[Tackleberry41]

Why? In a single shot the 30-30 has better ballistics, has a better neck length for cast and can use pointy bullets/boolits if you want. In my opinion the rimmed cartridge is a better choice for single shots. Of course, there's the "Oh Wow, a new cartridge to try" factor to consider.;-)

I did look into the 300AAC when I was going to do a fast twist 30cal subsonic rifle. Yea I have brass to modify, but no dies etc. I already had everything to load 30-30. It will do everything the 300AAC will and then some. More case capacity, so using leverlution powder will get 150gr bullets going right about 2800fps. Or as little as 6gr of S1000 to get a NOE 247gr going subsonic.

The only real use I see for the 300AAC is in a semi auto and a suppressed one. Only thing going for the 300 in a bolt gun or single shot is the barrel twist. 7.62x39 the limit is about 200gr or so subsonic due to twist. But is that extra 25 or 30 gr worth all the extra effort?

[popper]

Andy - you probably need a 1:7 or 8 barrel. I can run 150 ~ 2k fps OK, 168 a tad slower, both jacketed. I have a 170 & 185 to try maybe next month. I run a 145PB @ 2100, 1 1/2 MOA. Good groups @200 - you need lots of practice. I ran some 220 factory stuff @ 100, 4-5" groups. I would prefer not to do that hunting but steel you could get it to work. Other problem is the recoil in a light SS. 3rd problem is powder space in that small case.
I keep seeing all these silly arguments about BO, x39, 30/30 & others. I'll call BS on 150@2800 from a 30/30. That's past 308MX and almost 308W. No levergun is going to take that, much less my shoulder.

[Tackleberry41]

Not BS, mistyped.

[popper]

OK, just posted to make sure nobody expected that or worse, tried to load to that..

[rockrat]

I had a SS in 300 bo. If the wind would cooperate I could hit the 500 yd small gong (7" square) all day. I used 110 vmax, 125 speer TNT and the 125 nosler, along with 147gr fmj m80 ball. didn't shoot many cast thru it. Rechambered it to 30-223. Just haven't had time to shoot cast thru it yet. Its a 1-10" twist.