[ARCHIVED THREAD] - 75 gr.

Posted: 6/12/2008 10:22:42 AM EDT

can i shoot 75 grain ammo accurately in my 1/9 rra upper

Posted: 6/12/2008 10:24:31 AM EDT

[#1]

You'll have to try it in YOUR rifle and see if it stabilizes, (especially since you gave no barrel length for this 1/9 twist rifle).

mike

Posted: 6/12/2008 10:24:47 AM EDT

[#2]

the answer is "maybe"

the only way to be 100% sure is to buy a box and shoot it.

Posted: 6/12/2008 1:53:58 PM EDT

[#3]

sorry its a 16 inch chrome middy

Posted: 6/12/2008 2:20:06 PM EDT

[#4]

My 1/9 RRA 16" non chrome shoots 77gr black hills great.

Really the only way to know is to try it.

Posted: 6/12/2008 2:33:55 PM EDT

[#5]

My 14.5" 1x9 will NOT stabilize 75gr or 77gr past 100 meters.

Posted: 6/12/2008 5:22:33 PM EDT

[#6]

Here's a handy reference from ATK. I measured a 'T1C' version of the 75gr Hornady at .982". Per the chart 1:8 will marginally work and 1:7 would be better.

http://le.atk.com/pdf/223_MinimumTwistRates.pdf

My partner's 1:9 bushy won't group 75gr 5.56mm TAP very well at all. My 1:7 LE6920 put 5 shots into ~0.6" at 50meters using an ACOG.

[ARCHIVED THREAD] - 75 gr.

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[ARCHIVED THREAD] - 75 gr.

[ARCHIVED THREAD] - 75 gr.