Confirm Action

Are you sure you wish to do this?

Confirm Cancel
User Panel

Page AR-15 » Ammunition
AR Sponsor: bravocompany
Posted: 12/29/2002 12:30:02 PM EDT
I was trying to calculate some trajectories of Win USA 55 grain Q3131A through my rifle and went to Winchester's website to get the info. It showed a  ballistic coefficient of .267 and muzzle velocity of 3270 f.p.s. Does any one know how much speed to deduct for a 16 inch barrel? I was assuming 60 f.p.s. per inch, but I didn't know what length barrel Winchester used in the testing.
Link Posted: 12/29/2002 1:01:14 PM EDT
Go to the ammo faq section. All will be answered there.
Link Posted: 12/30/2002 8:12:46 PM EDT
3270 FPS is typically the velocity of Q3131A from a 20" barrel.

This is an assumption based upon seeing a lot of ballistic test data, but I can't guarantee it.
Link Posted: 12/31/2002 9:30:11 PM EDT
3270fpseven out of a 20" barrel--- I wish.  I have cron'ed this for for six months, and  lot no. SC12 is a very consistant 3050FPS.  But on the plus side, SA battlepack ammo ( 1986) is a consistant 3250, and so is Fed. XM193.
  Happy New Year from NW IN.

"we need the ammo"
Link Posted: 1/1/2003 12:19:45 PM EDT
Expect around 3050-3120 from 16" with q3131a depending on conditions.
Page AR-15 » Ammunition
AR Sponsor: bravocompany
Close Join Our Mail List to Stay Up To Date! Win a FREE Membership!

Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!

You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.

By signing up you agree to our User Agreement. *Must have a registered ARFCOM account to win.
Top Top