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Posted: 12/17/2002 8:36:42 AM EDT
[#1]
The velocity problem you are having is the result of a 14.5" barrel. Take that same Q3131a and chrono it out of a 16" and a 20".
That loss is the reason I won't own a 14.5" barrel...especially when I still have to have 16" total length. The velocity loss simply isn't worth it to me. |
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Posted: 12/17/2002 8:42:02 AM EDT
[#2]
If I were you, then I'd post this question in another forum on this site.
(Maybe in the AR15 "Equipment" forum?) I don't really see it as an ammmo issue either, and you may get more helpful feedback there. |
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Posted: 12/17/2002 6:13:14 PM EDT
[#3]
1:7 will lower the velocity compared to 1:9, but only a very tiny amount (10-20 fps). Not enough to matter.
-Troy |
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Posted: 12/18/2002 3:30:30 AM EDT
[#4]
What distance is your Chronograph from the muzzle? 5 yards is where M193 Ball is measured. Last lot of Q3131A I tested was 2998 at 15 feet. From a 1/9 twist M4. Was 3220 +/- 22fps from a 20" bbl. Met M193 spec just fine.
-- Chuck |
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Posted: 12/18/2002 6:24:01 AM EDT
[#5]
Seems I posted Chucks [b]complete[/b] results, with his permission, over @ .223 Ammo Review.
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Posted: 12/18/2002 6:28:22 AM EDT
[#6]
chuck,
i was about 10 feet from the chrono. i thought 14.5 inch barrels gave better than 3000 fps but upon searching i see that some guys are getting the same results from 14.5's. thanks guys. |
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