AR build

I think you're right. Also, 1:12 is standard for non-tactical .223 bolt guns. I have a Rem 700 and a Howa and they both shoot 40 and 50 gr V-Max loads quite well. Have never tried anything heavier/longer, but I would expect groups to open up when you hit 55 gr and up.

 

This website doesn't list Bushmaster in the comparison. What is the basis for your comments?

 

please keep it civil. thanks for all of your help so far!

 

These guys know a little sumpn about accuracy...
http://www.6mmbr.com/223rem.html


Twist Rates
The .223 Rem shoots a wide range of bullets very effectively, from 35gr flat-based varmint bullets, to ultra-long 90gr VLDs. However, you'll need the right twist rate for your choice of bullet. For max velocity and accuracy with the lightest bullets, a 1:14" twist may be ideal. More versatile is a 1:12" twist that will allow you to shoot the popular 60-64 grain match bullets. (However, a 1:9" twist is needed for the steel-core 62gr bullet used in the M855 military loads, because that bullet is as long as most 70-grainers.) For normal lead-core jacketed bullets, a 1:9" twist will let you shoot up to 73gr bullets. Since most .223 Rem shooters prefer bullets in the 50-73gr range, a good "do-it-all" solution is a 9-twist, unless you're a Highpower competitor.

For long-range match purposes, long, high-BC bullets are favored for their ability to buck the wind. You'll want at least a 1:8" twist to shoot the 77gr and 80gr MatchKings and 80gr Bergers. To shoot the new 90gr pills, a 1:6.5" is recommended, though a true 1:7" will work in most conditions.

Overall, what twist rate is best? For varminting we like a 12-twist. The slower twist will give you a bit more velocity, and minimize the risk of jacket failure at high rpms. For general use, an 8-twist barrel will let you shoot the excellent 77gr and 80gr Sierra MatchKings and nearly all varieties of non-tracer milsurp ammo. We'd only select a 1:7" or faster twist barrel if we had a need to shoot the 90gr VLDs.

Barrel Twist Rate 1:14" 1:12" 1:9" 1:8" 1:7" or 1:6.5"
Max Bullet Weight 55gr FB 65gr FB 73gr BT 80gr BT 90gr BT VLD

 

ill post this again. ^
http://m4carbine.net/showthread.php?t=82739

 

Good grief, not the chart...

 

lol its a "new" chart.

If JD is happy with his bushmaster then awesome! Im happy for him and that it has never let him down. I've got a buddy with a bushmaster and his always works too.

 

Not trying to bust your chops but this new chart doesn't list Bushmaster either. Instead you tell usthat not only do I find the Bushmaster to be a dependable rifle you apparently have a friend that has the same experience that I do. Do you have any actual experience with a Bushy?

The "Mil-Spec" standards for the M-16/AR-15 rifles are over 30 years old! Don't you think it just might be possible that manufacturing methods, design features and materials used might possible been improved since then?

The U.S. military seems to think so. The M-16/AR-15 was not permitted to be part of the recent competition for their new assault rifle. The FN SCAR won that competition to replace the M-16/AR-15 platform. The M-16/AR-15 is going the way of the Springfield 1903, the Garand M-1 and the Springfield M-14, to surplus.

YMMV

 

Not disagreeing with your opinion, but I think your info is outdated here - the 5.56 SCAR SOCOM project was cancelled, and I don't think the SCAR has a chance to replace the M4 as general issue. Yes, the M4 will eventually be replaced, but not in the next 2 or 3 years and not by the 5.56 SCAR.

 

look at the names that refused to participate in it: Bushmaster, Armalite, DPMS...
I personally like to make informed purchases. It seems to me like those that dont want to participate hope to keep making sales based purely on their "good" name to uniformed consumers YMMV

 

Finished!
Parts:
DPMS stripped lower
Spikes LPK
DSA Buffer spring assembly
Magpul MOE stock, grip, forearm
Magpul trigger guard
Palmetto State Armory hammer forged lightweight FN barrel, upper



waiting for magpul BUIS, using bushnell TRS 25 with UTG riser for now.

 

Looks good.
Time to go make some noise.

 

I really like the FDE parts

 

looks great OP!

time for range report

 

Waiting for my BUIS, then off to the range!