The Firing Line Forums - View Single Post - imr 4198 and 65 gr Sierra Boatail (5.56 load)

zcrenna · July 12, 2013, 03:38 PM

Never used either. Only experience close is 69gr sierras out of my AR.

Are you shooting a bolt action or AR?

This is out of my Sierra manual for .223 in an AR15

IMR-4198 under a 69 grain Sierra HPBT
18.8gr - 2500fps
19.4 - 2600fps
20.0 - 2700fps
20.3 - 2750fps

and then

IMR-4198 under a 60 grain Sierra HP
19.4 -2700
20.1 -2800
20.8 -2900
21.1-2950

I see nothing for 65 grain projectiles.

Consult another source as well and compare the numbers. 4198 is fast from what I hear. Start low and work up, checking brass for pressure signs often as you go.

July 12, 2013, 03:38 PM	#2
zcrenna Member Join Date: February 3, 2013 Location: Los Angeles, CA Posts: 60	Never used either. Only experience close is 69gr sierras out of my AR. Are you shooting a bolt action or AR? This is out of my Sierra manual for .223 in an AR15 IMR-4198 under a 69 grain Sierra HPBT 18.8gr - 2500fps 19.4 - 2600fps 20.0 - 2700fps 20.3 - 2750fps and then IMR-4198 under a 60 grain Sierra HP 19.4 -2700 20.1 -2800 20.8 -2900 21.1-2950 I see nothing for 65 grain projectiles. Consult another source as well and compare the numbers. 4198 is fast from what I hear. Start low and work up, checking brass for pressure signs often as you go.