300 Black out

[CWLONGSHOT]

Is anyone casting for the caliber?

I habent had good luck as noting really shoots great.

I’d like to try a 150-170g PLAIN BASE. Mold.

one mold that shot well is a Lyman 165 Spitzer gas check. I simply don’t need the GC at the attainable velocities esp when ya remember I PC everything.
Suggestions welcome.
CW

 

[Ben]

One of my nicest two cavity plain base .30 cal. moulds, the Accurate ( 31 - 175 BP ) , it is a clone of the SAECO # 315. A great plain base .30 cal. cast bullet.

 

[fiver]

what rifle?
the makers of the various 300 rifles don't seem to actually agree on what shape the throat should be, nor what the twist rate of the barrel should be.
what works in one of mine [pretty much anything] doesn't work in the other, mostly because it won't even chamber.

for something generic powder coated and slow I'd look for something weighing about 180-200grs. with a longer nose and some tiny lube grooves/drive bands.

 

[Brad]

Mine has a very tight throat and requires a .309 bullet at the fattest.
This is a cartridge with so many variables that it is hard to pick a one size fits all anything.

 

[CWLONGSHOT]

I have a few....

the RARR seems to work ok with all even feeding ranch dogs. (I have a 165g HP mold I have t tried) But the AR’s not so much. BUT I have t tried many. I bought the Lee 309/230 and frankly is suked. At least for me.
Bullets from 155-165 grs shot well enough to give some hope.

I just spied this one on NOE. It’s heavier but it’s profile is appealing for feeding.


a big concern is many are bore riders and adding PC makes many NO GOOD. I WANT to be able to shoot PC. I need to be sure the design dosent cause dia issues.

Another thing that’s in my head. I’m trying some Hornady 190 SUB X ammo. Approximating that if it proves agood shooter for me would be desireable.

I like the looks of that bullet Ben!!!

cw

 

[waco]

I have a RAR and the two I’ve had the best luck with is the Lee 312-155 and the NOE 250gr

 

[CWLONGSHOT]

I have read and looking at the LEE. (Is like to stay under 200) But it’s a gas check bullet. I’d really like a SB bullet. I “worry” about a GC bullet base with no GC.

cW

 

[Ben]

I’d really like a SB bullet

What is that ?
Is that the same thing as a plain base bullet ?

 

[scb]

I've had the best luck with 311365.

 

[Ian]

I have read and looking at the LEE. (Is like to stay under 200) But it’s a gas check bullet. I’d really like a SB bullet. I “worry” about a GC bullet base with no GC.

cW

And you powder coat? You haven't tried pcgc without the check?

The 300BLK has essentially a .30-'06 throat but slightly smaller. The Eagan MX3 bullet would be an excellent choice but be prepared for your rifle to prefer them sized .309" or .3095" so don't order it at .311" and powder coat it to .314"! I'd order it at .309" on the body bands if it were me.

 

[CWLONGSHOT]

I never “trusted” a gas check bullet shot with out a check
Gas gets up on the sides of the bullet. Leading accuracy problems are my worry.

 

[CWLONGSHOT]

What is that ?
Is that the same thing as a plain base bullet ?

That’s just this stupid liberal phone. Changes typed words because it thinks it’s smarter than me and did. It like P B.
Sorry I didn’t catch it before posting.
Plain base is preferred.
CW

 

[Ian]

I never “trusted” a gas check bullet shot with out a check
Gas gets up on the sides of the bullet. Leading accuracy problems are my worry.

Your mode of thinking isn't exactly how gas pressure works in the system. Try it sometime.

 

[freebullet]

Prices being low & having a growing bag of range brass for this caliber have been mulling options.

Thinking.... 7.5-10" pistol for subs only build?

 

[Ian]

10.5" is as short as I'd go. 9" is what AAC considered the minimum IIRC and I know folks who have made 8" work with suppressors but it can require considerable tweaking to make work right. The extra inch or two of barrel doesn't make all that much difference to the handling, especially if you forego the totally unnecessary flash hider and just put a thread protector on the muzzle. It will be loud, very loud even with subs, but will be louder if you run a FH or brake.

Be warned, if you build an AR pistol you will soon be wishing for a shoulder stock and a muffler......

 

[Jack Swilling]

My AR pistol uppers are all 10.5"
All of them
Have the MP 230 grain mold
Have not fired it up yet
The Hornady GMX 110 grain works well

 

[CWLONGSHOT]

Mines not that short and not a pistol.

As to a cast bullet ment to have a gas check. I have shot it before and never seen good accuracy. I blamed the base of the Bullet. With a PB if there is damage to that base that bullet gets culled. Based on that, why/how would shooting a gas check bullet with out a gas check be any different and OK??

Educate me

CW

 

[Brad]

What did you use. bullet design, alloy, lube, powder and charge, size diameter.

 

[CWLONGSHOT]

Many different selections!!

309-312 diameters

lino to 20:1

You don’t lube PC... ;(

not enough room to list powders...

designs? Well more than a couple. RN pointed flat points. But again that’s tip and mostly FEEDING not base.
I am not being difficult or a smart arse. I don’t know it all by a long shot...
But I do have over forty years loading most calibers with over fifty die sets here. and thirty ish casting with dozens of molds. BUT Only about 3years powder coating.

 

[Brad]

What did you load with 230 Lee with? I have had good results with the NOE 230, seated a bit deep, and 4227.
I had good results with the MP 30 sil using H110.
I have best results sizing to .309. With PC and the right size and a decent throat leading shouldn’t be an issue.
Obviously a pointy bullet is more likely to feed well in the AR. I would look for an AR friendly design and ask Al at NOE for a plain base version. For powder I would be looking at 4227 if you want the rifle to cycle. Could try 1680 too.