Comments on: Barrel Length and Velocity in a .223 Rem — Barrel Cut-Down Test

By: Tim

Tim — Wed, 01 Jun 2016 00:31:17 +0000

…If I were that accurate with my 243, I could shoot elk in the head at 700 yards. Don’t think I’d ever take that shot though.

By: Tim

Tim — Wed, 01 Jun 2016 00:29:30 +0000

Shooting squirrels at 500 yards with a semi auto 223 is pretty amazing. I shoot 1″ groups at 300 with a 243 85gr or 100gr, out of a sporter barreled bolt action, and I thought that was good. But that’s nowhere near hitting squirrels all day at 500. I didn’t think a 55gr leaving at 2900 could be that stable and predictable.

By: Bruce

Bruce — Mon, 30 May 2016 03:31:51 +0000

M-193 Ball (55gn FMJ) appears to have been optimised for the 20″ barrel of the AR-15 / M-16.

Back when Australia still had a sense of humour, I had several AR-15 rigs. One had a 24″ barrel with 1:8″ twist rifling. Very nice with 68gn HPBTs.

With Ball or equivalent loads, there was little improvement in MV over the standard 20″ job, leading me to suspect the “optimisation” of that ammo for rifles with a 20″ tube.

My “pet” bullet was the Hornady 60gn HP, which was (and still is) a superb performer.

Slightly compressed loads (25.5gn)of ADI/Mulwex AR2206, (similar to 3031, almost the same as BLC2 or 4895) would consistently print under 3/4″ at 100 from a stock-standard SP-1. (2-7x Leupold clamped on top; I’m not THAT good with iron sights). The Hornady bullet is short enough to:

1. Stabilize in a 1:12″ twist barrel at “warm” but realistic velocities from the Colt original chromed rifling.

2. Not take up a lot of “powder space” when seated to feed from a magazine, thus enabling use of said powder space.

Even more interesting was that lighter charges of the same powder produced noticeable pressure signs, like primer “cratering”, whereas the 25.5 left a very slightly “flattened” primer, (Federal), but NO cratering around the striker impact.

By: Bruce D'Ag

Bruce D'Ag — Sun, 29 May 2016 19:51:46 +0000

This year as well as last Lear I went Sage RT hunting in Oregon with three of my buddies.
I shoot my AR-15 with a 24″ Stainless bull barrel and Privi-Partisan 68 grain Match ammo. My friends shoot 22s and HMR17s at 10 to 250 Yds.
I shoot 250-500 Yds. I was amaxed that I only had to raise 1-1/2 Mil dots to vaporize hundreds of these Chipmonk to Grey sqyirisize Varmints at 500 Yards. What a fun time helping the farmers get rid of these destructive pests by the hundreds in a day.