As I uderstand it, the Blackout is better for the 220 and 240gr sub loads, were as the Whisper's shorter throat is better suited for 125 gr. super sonics...

So since Im currently building an AR with one of Tp555'S .300/.221 barrels, I was thinking about building a bolt gun for subs later this year.

My question is, can I get away with using the Blackout dies for both? Or will there be issues with the throat length and the crimping? Im asking cause I have yet to buy my dies and will be needing to start some loads up here in a few weeks hopefully.

The BLACKOUT throat is why it can have higher velocity with 125 grain bullets.

Likewise, that is why 6.8 SPC-II can be faster than 6.8 and 5.56mm can be faster than 223 - even with short/light bullets.

rsilvers - Just wondering why 220's and not 240's, or etc..?

One of our good customers wanted 220 so that is what we did first.

I don't know for sure what is better, 220s or 240s. I know 240s cost a lot more.

How confident are people that 240s work in 1:8 twist?

Ammo
 

rsilvers
I saw Midway had 300BLK ammo backordered. Any idea when it will be easy to find?

I dont care for the 240s. Waaaay more expensive and finicky when it comes to good loads.

I have put over 600-700 240s through my bolt gun and auto, both 8 twist Lilja barrels, with no stability problems. But I am at 5,000-7,500 feet. If they were marginal, they might not work at sea level.

After I burn up the last of my 240s I will just shoot the 220s and 175s from now on.

Have been shooting some 240's from Clearwater Custom with no problems. But they are not near as long. Some like them for tumbling effect, I prefer a nice fat nose after impact for a good blood trail. Has anybody here used a 26" or 28" barrel, and how did it sound?