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1/25/2018 7:38:29 AM
Posted: 3/19/2006 11:43:33 AM EST
I have read, and reread Troy's post on the best loads for .223 weapons. Outstanding I must say.
My question is in the slower twist barrels at what range does the heaver round start to loose stability; 0 to 50 yards 50 to 100 yards or beyond.
If you take a 20in 1/9 twist and try and shoot 75gr how far would you expect the round to stay stable? How much difference would loading to 5.56 rather than .223 make?
Link Posted: 3/19/2006 1:00:27 PM EST
[Last Edit: 3/19/2006 3:31:09 PM EST by TigerStripe]
As far as the barrel twist-stabilizaton ratio, all barrels are different. Some people's 1:9 barrels handle 75 or 77 grain ammo well, some don't. (If you look at a box of Hornady 75gr bullets , not ammo, you will see "for 1:9 twist" on the box) 5.56 powder loads should give you 150 to 200 fps more than .223 load generally speaking, which means longer fragmentation range.

Link Posted: 3/19/2006 2:02:03 PM EST
My Bushmaster 1:9 twist 16" Hbar shoots nice 6-8" groups at 300yards with nice clean holes with 75gr Black Hills Blue Box when I am up to the task(which is rare). Even my nasty 12-16" 10 shot groups show no signs of keyholing. I haven't shot paper past 300 yards yet, but I can get consistent hits on "man-sized "gongs at my local range out to 500 yards with the same ammo and a good scope. YMMV
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