300 Blackout in Bolt Action or AR Plateform

[BadgerShooter]

I have an AAC Single Shot with a 1/7" twist. It shoots anything 150 and heavier great but anything less, it shoots about 3-4". I swage a 250 boattail that will shoot an inch or a bit better at 100 out of the little thing. Another interesting load is Speer 150 Hot Cores with a top load of Shooters World Socom. Shoots about an inch at 2100 fps. No joy with cast bullets of any weight.

I experimented with all sorts of things to get the 250's to expand at subsonic speeds including pre-fragmented cores, hollow points, etc. They have a huge lead tip. No significant expansion with anything I did. The Hornady 190 grain factory ammo expands a bit and shoots pretty well.

[FergusonTO35]

Thanks folks, I 'spose I can cross the .300 off my list. Don't need another jacketed only rifle to feed!

[BadgerShooter]

It would probably be an interesting cast bullet cartridge with a slower twist. 1-10 - 1-12 or so

[Texas by God]

It would probably be an interesting cast bullet cartridge with a slower twist. 1-10 - 1-12 or so

Exactly what I thought. A ten twist 300 BO would be lots of fun.
My 7.62x39 and 6.8 SPC AR15 rifles both have 1-10” twist and shot cast well from the very first load.


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[Plate plinker]

If you want to get a bolt action, a .308 can do everything the .300 BO can do and a heck of a lot more.

But if you like cute little cases....it does not scratch that itch.

Except smaller magazine capacity if that matters to the user.

[TXCOONDOG]

Exactly what I thought. A ten twist 300 BO would be lots of fun.
My 7.62x39 and 6.8 SPC AR15 rifles both have 1-10” twist and shot cast well from the very first load.


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I have a 6.8 SPC II with a 11 T, but casts out of it doesn't appeal to me. However, I have a Wild Cat (30 Saber Cat) with 11.25 T and uses a necked up Dasher case that I may try with casts. Both are light weight (under 7 lbs with optic, loaded and suppressor).

Afterthought question: I have an adjustable gas block on my AR, but it's a mid-length system and wondering if that might cause a cycling issue with subs?

[Outer Rondacker]

I have a 6.8 SPC II with a 11 T, but casts out of it doesn't appeal to me. However, I have a Wild Cat (30 Saber Cat) with 11.25 T and uses a necked up Dasher case that I may try with casts. Both are light weight (under 7 lbs with optic, loaded and suppressor).

Afterthought question: I have an adjustable gas block on my AR, but it's a mid-length system and wondering if that might cause a cycling issue with subs?

Yes. Most have to go with a pistol length gas system to get subs to run. You can always run a reduced spring and lighten the buffer but not really the way to go.

[Ajohns]

The bolt I built a couple years ago, I did with a 1-12 twist. Shoots awesome cast or jacketed.
Remington action, McGowen barrel.
But I do have both this and an upper for AR, they have their place, but for a one gun n done, bolt hands down.
Way more versatile.

[TXCOONDOG]

I went to the LGS today to see what they had and end up buying a 46 cal can that's rated for all the big bores (45cal and less) and you can remove the baffle stacks. It also comes with a 30 cal adaptor and piston system for pistols.

I need to start looking for a threaded 45-70 or is there something else I should be looking at for casts?

[buckwheatpaul]

I have a Savage Model 12 in 223 I can covert to Blackout or buy a dedicated 300 BA. However, I've been leaning towards an AR.

My biggest draw back on the AR is that it may not feed FN bullets reliably. I will be shooting them super and subsonic with a suppressor.

Give me your thoughts between bolt action or AR feeding?

I have a Ruger American in 300 and had a Diamondback in 300. I love the bolt and got rid of the AR....I have never liked them. The Diamondback was great and had a good trigger and was plenty accurate but I just hate the AR platform...had over 5 over the years and just plain dont like them. The Ruger is a tack driver and with the can on it is super quiet. Hope this helps.

[Fitz]

I f you want to shoot cast try the 300 HAM'R with the 1-15 twist ,I am shooting 185 gr. into 1 inch groups running around 1700 fps out of a ar-15

[Gtek]

Both and just see, been there done that, duplicate! Then figure out that you will probably keep both and just get on with it.

[Bigslug]

Given that you can get something approximating big bullet performance out of a 5.56 by using the likes of bonded core or Barnes expanding coppers, I don't see much sense in converting an AR into anything else.

If you're interested in having a truly effective suppressor, anything with a reciprocating action and a sproingy buffer spring kinda burns that notion to the ground.

And then yes, there's big meplat cast bullets.

BOLT GUN!