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Gaspipeshooter
7 December 2014, 10:33
Saw the "American .30 Cal. Black Hole Weaponry" cartridge and barrels on their Facebook page. Anyone else seen/heard anything about it?

BoilerUp
7 December 2014, 15:03
http://i1259.photobucket.com/albums/ii552/glshooter2/comparisona-30ad-3_zps95efa511.jpg (http://s1259.photobucket.com/user/glshooter2/media/comparisona-30ad-3_zps95efa511.jpg.html)

From their forum:


As many of you know BHW has been working on the American 30 for about a year. following a few months of concept discussion We decided to use 30 Herrett dies and hold them off from the shell holder cartridge allowing for a large case capacity.

Once the original reamer was ordered and a few barrels were made up the testing started. Originally it was a full length case but while we could make it run the extra length limited heavy bullet choices somewhat. A new reamer was ordered with a shorter OAL case with the shoulder moved back somewhat. It seemed to run OK but as the shoulder was so high we found fire forming was needed. Not a good deal for many reloaders and cost prohibitive. Calculated cost to get a fully formed case was somewhere in excess of $1.50 plus the wear and tear on the platfiorm. Once again the shoulder was bumped back and the case was allowed to stay as long as was practical. On the third reamer now things were looking up. Case capaicity exceeds the 7.62X39 so we knew that the performance would be there.

Following the final design change a few barrels were made up to allow for pressure testing and actual range performance. Ritch is working the pressures and doing some load work ups for velocity as there are other projects in the works for this one. So far velocity numbers are excellent. He is getting up to 2800 with the 130's, 2850 on the 125's, 2950 on the 110's and found that 2500+ on the 150's is easy but we haven't settled on that one yet.

I shot the rifle last weekend for a quick shakedown loading a load that I knew was safe but wanted to get my feet wet ASAP. I decided to try two different powder charges on the 125's using small, FC, and large, REM, primed cases for a velocity comparison. As expected the Remingtons ere a tad faster with the same powder charge.

Read more: http://blackholeweaponry.proboards.com/thread/1760/american-30-range-testing-report#ixzz3LFvxBJLz

Kopis
8 December 2014, 06:29
30 cal AR market is getting crowded. What does it offer over the 300AAC?

caporider
8 December 2014, 06:38
Eh... It's a 6.8SPC-based wildcat so you have to use 6.8 mags and bolt. I'd be more interested in BHW's 6.5mm 6.8-based wildcats.

GaSwamper
8 December 2014, 09:25
Eh... It's a 6.8SPC-based wildcat so you have to use 6.8 mags and bolt. I'd be more interested in BHW's 6.5mm 6.8-based wildcats.

Just curious, why wouldn't you want to use 6.8 bolts or mags?

din
8 December 2014, 18:13
I think I'd go 6.5 Grendel before I built one of these. Looks interesting but would rather have better long range performance.

GaSwamper
8 December 2014, 19:58
270 AR or 7mm Valkyrie. 130gr. at 2800 plus would be my choice.

caporider
9 December 2014, 08:30
Just curious, why wouldn't you want to use 6.8 bolts or mags?

The primary appeal of 300BO is the ability to use AR15 5.56-standard bolts and mags. If you're going to jump to 6.8SPC bolts and mags I'd much rather use 6.5mm projectiles than .308 ones. That's just me, of course.