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Old 08-07-2012, 01:43 PM   #11
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Originally Posted by steve4102 View Post
What is a barrel length envelope?
The distance that the round stays above the speed of sound . Yes you can hit targets further than that distance but not with any predictable accuracy. It also depends on a particular bullet's ballistic coefficent, bullet design, bullet weight, charge weight, as well as atmospheric conditions, and elevation above sea level

Thats what is meant in military manuals as a firearm's effective range, m16 is right about 650m, m60 about 800m, m9 pistol 65m etc (im not 100% sure on the exact current effective ranges just giving examples) maximum range is the range at whicha particular firearm is capable of being fired
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Old 08-07-2012, 08:44 PM   #12
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Originally Posted by steve4102 View Post
Barrel length affects a lot of things, things like velocity, muzzle lift, sight picture, etc., but accuracy is not usually one of them. A quality barrel is a quality barrel short or long and a POS barrel is a POS short or long.

Here is a little test on barrel length, Velocity and Accuracy in 223. As you can see even the shortest barrel was still very accurate. Note even cut to 10 Inches the rifle was still shooting .6 MOA.
First off,Jon did a good job of explaining things.
Now the weapon that the OP is wanting to be a "Tack Driver" is this-

re-loading - AR-15 Discussion

Not exactly the most precision made weapon in the world,and definitely not a "tack driving" quality 223.
It is very fun to shoot,and beyond the word LOUD,ear protection is a must have with these guns.
Shooting mine with a bipod on a bench with rear bag,I only have a few loads that will shoot close to 1 moa,most are in the 1.5-2 moa range off a bench.
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Old 08-09-2012, 11:26 PM   #13
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ok thanks, guess my use of the term "tack driver" was an exageration!!!! i really dont expext this gun to sub moa at 100 yerds. maybe 25 yrd though. txhillbilly, care to share your few loads that come close? i have been re-loading for a few years mostly .44 and 9mm
thanks all
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Old 08-10-2012, 12:07 AM   #14
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If I wanted a tack driver, first I'd buy a tack driver rifle, topped with a Zeiss or Schmidt & Binder scope. Then a bench rest loading set up including an in-line arbor type press and custom dies cut with the same reamers that the rifle's chamber was cut with.

Then I'd start thinking about bullets. Just my $.02
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