Custom Howa Stock
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Thank you everyone for positive comments. Some of you have asked how it shoots. If you remember from previous posts, the receiver is fully bedded. It is however not pillar bedded. At this point I don't think I need it pillar bedded.
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This is a five shot group from 100 yards off the tailgate of my truck. The load is 27.7 grains of aa2520 behind a 120g Sierra Pro-hunter.
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Glamour shot for giggle sake. I took it out coyote hunting, didn't call anything in.
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That looks classic.
Your load is about 3 full grains short of max in an AR15 BTW.NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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Originally posted by BjornF16 View PostBeautiful work BD...and nice Glamour shot!
What wood did you use for the fore end tip?
Originally posted by LRRPF52 View PostThat looks classic.
Your load is about 3 full grains short of max in an AR15 BTW.
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Especially under a flat-based 120gr cup and core bullet, you will be able to get way more AA2520 under it and still not exceed 50,000psi.
If you look at AA's data, the data in the Grendel Handbooks we put together, and any other 120gr cup and core bullet (most have boat tails and take up more case capacity than the Sierra Pro Hunter), you'll see max loads for the AR15 at 30.6gr, 30.7gr, and 31.0gr when looking at AA2520.
In the bolt gun, you can push a bit past that and still be comfortably away from excessive pressure.
I recommend building a simple pressure ladder in .3gr increments (1% of case capacity), firing that ladder over a chronograph, and seeing what your trend line is.
I personally would have zero reservations about loading up to at least 32.0gr with AA2520 under a Sierra Pro Hunter flat-based soft point.
Not that you need 2700fps mv, especially with that bullet, but you could easily go there if you wanted.
Sierra doesn't have any data for the 120gr Pro Hunter on top of AA2520.
Alexander Arms has AA2520 data for 120gr Norma FMJ (31.0gr max), 120gr Nosler Ballistic Tip (30.6gr max), 120gr Sierra Match King (30.6gr), 123gr Lapua Scenar (30.7gr max), 123gr Sierra Match King (30.8gr max), 129gr Hornady SST (29.4gr max), the 140gr Berger VLD (29.1gr), and 144gr Lapua FMJBT ( 29.0gr max).
Unless the powder formulation is so drastically different with your lot, I would say you have a lot of room to work with over 27.7gr of AA2520 under a 120gr flat-based soft point.
Have you chronographed your current load? I'm guessing you're in the 2350fps region if that's a 20" barrel. You could easily gain 300fps and still not exceed 50,000psi (a limitation for the AR15).
There is hardly any recoil currently, I imagine. I doubt you're much over 40,000psi.NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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