55gr FMJs in a 1:7 twist AR15

[sentry1]

So, I know that fast twist barrels are better suited for heavier bullets. Do lighter bullets like the 55 gr bullets suffer from the fast twist? Given a choice between 55gr and 62gr ammo for plinking (vs the 77gr SMK for... I dunno yet, I'm new to this) is one better than the other in a 1:7 twist 16" barrel?

 

[johngfoster]

Re: 55gr FMJs in a 1:7 twist AR15

55gr FMJs shoot just fine in all my 1:7 twist barrels. None are match winners, but they shoot as good as in my 1:9 twist barrel.

 

[TimK]

Re: 55gr FMJs in a 1:7 twist AR15

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: johngfoster</div><div class="ubbcode-body">55gr FMJs shoot just fine in all my 1:7 twist barrels. None are match winners, but they shoot as good as in my 1:9 twist barrel. </div></div>

Same here.

 

[KAZ]

Re: 55gr FMJs in a 1:7 twist AR15

Each barrel will shoot certain bullet weights/designs better than others, so you will have to test. For example my Krieger 7.8" twist did not like 55GN ZMAX bullets that some of my other 8 twist barrels love. So, I tried 52gn AMAX and is under 1/2". All with the same CFE 223 powder/CCI41 primer combo. Of course these 7/8 twist barrels all seem to love the 77gn.

 

[bigdog2003_99]

Re: 55gr FMJs in a 1:7 twist AR15

My noveske 1/7 10.5" barrel loves 55gr ammo. Every 1/7 I've fired had good results with 55gr. ymmv

 

[ORD]

Re: 55gr FMJs in a 1:7 twist AR15

I've never experienced any issues shooting 55gr pills from FMJ/ball stuff to BTHP match loads through 1:7 twist tubes.

 

[samnev]

Re: 55gr FMJs in a 1:7 twist AR15

I've never shoot 55 grain bullets in my 1:7 twist barrels but 52 grain SMK's shoot great groups in the 1:7 twist. May have to try the 55 grain bullets based on these post as i have over 3K of them sitting around.

 

[1Sg (ret)]

Re: 55gr FMJs in a 1:7 twist AR15

Hornady 55 fmj with 24.5 gr of H335 and a rem case. Shoot an inch or better in all my 1/7 barrels @ 100 yds.

 

[Rade1MOA]

Re: 55gr FMJs in a 1:7 twist AR15

I tried several types of 55 gr out of my Ambush / Daniel Defense 1:7 all about 1.5 -2 inches. The 77 gr Fed match shot .62

 

[ATDriver]

Re: 55gr FMJs in a 1:7 twist AR15

I have shot a lot of them through my 1:7