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It does seem a bit low, although the Hodgdon printout I downloaded shows an 85 grain Speer with 25.5 grains of H335 at 2818 f/s from a 24 inch test barrel. Thats 4 more inches than I am running. I don't see any visible signs of pressure on the cases. This has just been a mystery to me.
One thing I failed to mention...I was so happy with the way it was grouping with the 75 grain vmax. I couldn't help myself, I ordered another same spec barrel and put together a second upper, as fate would have it, this one too preforms (as far as I can tell) identically.
What I really find perplexing is how well it shoots the 80 grain GMX. The GMX is longer than any of these 85, 87 or 90 grain lead core bullets. And it doesn't seen to have any problem stabilizing the GMX at 2400 f/s. They are so long it really cuts into case volume.
I think it would be worth the effort, costs and weight to order a 24 inch barrel and see how it handles the heavier bullets. If nothing else it should render a little more velocity.
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Well I went ahead and ordered a 24" barrel from BlackHole. I wish more manufacturers offered this chambering (6mm-45). I think it probably one of the best/optimal chamberings offered in the ar platform (IMHO).
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Blackhole says it should ship by August 17th. I hope it is worth the wait! In the meantime I bought another receiver group and parts to put together another gun.....it must be a sickness.
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I'm not getting the consistant accuracy out of my BHW 18" 10-twist 6x45 I was hoping for, although I have shot some decent groups. Only have tried AA2015 & Benchmark for load work-ups.
This 5-shot 0.389" group @ 100yds was using 70gr Nosler B-tips over 24.5gr AA2015 right at 2798fps.
http://i124.photobucket.com/albums/p31/eneranch/13.jpg
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Nice... I hope my Blackhole barrel shoots as well, I just hate the wait.
I have been playing with the notion of ordering another 24inch barrel from DTECH and making a comparison.
Have you tried any of the 87 or heavier bullets?
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75gr is the heaviest I've gone; this rifle is my coyote calling rig so no need for more weight.
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my 20" bhw really likes 75gr vmax behind 8208 and cci primers
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8208 is one powder I have yet to try....I will have to pick some up.
Mine too posts nice groups with the 75 and 80 grain bullets, where I seem to have problems is in the 85 and greater realm. I may be expecting too much, it is just hard to accept a 2 inch or greater group when all the lighter bullets well inside 1 moa.
I have wondered if it might be the chamber on my barrel, with regard to the throat. I am limited by the magazine as to the COL and the ogive of the heavier bullets may be increasing the distance of the lands.
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I wish that black hole barrel would get here!
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Gave Varget a try the other day; red dot is 3/4"
It's only 3 shots, but I LIKE !! [Wow2]
I'm heading back out tomorrow to see if I can duplicate this result; and a new battery in chrono to get FPS
http://i124.photobucket.com/albums/p...scan0001-1.jpg
