1x7 twist AR

[poncaguy]

Was shooting mine the other day, 55 grain and 60 grain were lousy almost two inch groups.Then shot some Hornady 75 grain Match.........dime size group, the, for the heck of it, shot some 40 grain Fiocchi V Max........dime size groups......(all groups were 3 rounds)...... Very pleased.........

[dogsoldier0513]

My first AR was a Colt Gov't Carbine, ca. 1989.  It had a 1/7" twist and would group its best handload (R-P match-prepped cases, W748, CCI Benchrest primers and a Hornady 62 gr. HP) into 1/4-inches @ 100 yards all day.  The rifle had an ARMS mount, Tasco target scope, Harris bipod and was fired from a bench with sandbags supporting the buttstock..

[teddy12b]

Sounds like you found the ammo it likes!

[Lloyd Smale]

my 1in7 colt custom will shoot 60 grain vmaxs pushed with 748 into a 1/2 in at a 100. Thats with a standard weight 16 inch stainless barrel.

[454Puma]

The lightest I've shot out of my Colt is the 50 gr SEI. Took awhile to get the load right but it shoots them very well. I don't see the need to go any lighter.  Sure you might get the speed but SD drop off so you don't get down range energy except for small varmits.   I use my 22LR on them.