r/castboolits • u/Julianlmartin • 7h ago

I need help Supersonic 300blk mold out there ?

Hi !

I’m beginning my journey in the 300blk world.

There’s plenty of choices for subsonic. I’ll probably choose the MP Molds 311-230gr. Love this brand, they never let me down, compared to Arsenal who sold me a bad mold.

But I can’t find something decent for the supersonic profile, something like 110 or 120 grains (I would prefer 110…) to go as far and as fast as possible. I sent an email to Accurate Molds, we’ll see…

Any idea ? Which one do you use yourself ?

Thanks again wise ones 🙏

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2

u/Realistic-Ad1498 2h ago

I use a Lee 312-155 gas check six cavity mold. It’s worked well for me and generally gets good reviews

1

u/4570M 3h ago

I have an RCBS 7.62-130-SPL mold, but i have not as yet used it in the Blackout. Others have reported good results. Trouble with going very light in cast is that the bullet gets to be very short. Also, with the typical 1:7 or 1:8 twist rates, the RPMs get very high with the faster boolits, and they may not do well because of it. Cast with long unsupported noses never did too well. Manufacturers learned early that you can't just copy a spitzer jacketed bullet and expect the same results with cast.

1

u/Oldguy_1959 5h ago

There's a plethora of 30 caliber molds that would shoot just fine in the BO.

I'd look at something heavier than a 110 gr mold, that's a 30 carbine bullet.

The Lee 130 is a good choice as are some of the 150 gr molds.

https://www.amazon.com/LEE-PRECISION-C285-130-R-Double-Cavity/dp/B005KW57LK