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1/25/2018 7:38:29 AM
Posted: 12/17/2002 7:28:13 AM EST
i looked through Oracle pages and searched here but can't find any info on whether or not the fast twist rate of 1x7 will slow down a bullet when compared to 1x9 or 1x12.

i was not real pleased to see my Q3131A ammo come out of my Colt M4 1x7 barrel at 2915 fps(low) and 2970fps(hi).

any thoughts?
Link Posted: 12/17/2002 7:36:42 AM EST
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.
Link Posted: 12/17/2002 7:42:02 AM EST
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.
Link Posted: 12/17/2002 5:13:14 PM EST
Link Posted: 12/18/2002 2:30:30 AM EST
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
Link Posted: 12/18/2002 5:24:01 AM EST
Seems I posted Chucks [b]complete[/b] results, with his permission, over @ .223 Ammo Review.
Link Posted: 12/18/2002 5:28:22 AM EST
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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