edmo01
Member
If you think you will be shooting bullets over 70 grains, get a 1-7" twist.
However, if you will be sticking to 55 grain bullets (like most of us), I suggest a 1-9" barrel. Depending on the individual barrel 1-9" twist rates can easily stabilize a bullet up to 69 grains and mine loves both 45 and 55 grain bullets.
Below are two groups at 100 yards while I was sighting in a scope. It is out of a 16" Colt heavy barrel with a 1-9" twist. The ammo is bulk Federal 55 grain FMJ.
Not bad accuracy from a barrel I bought in the mid-80s which has more than a few rounds through it. Although it isn't the latest military twist, it apparently spins them fast enough for 55 grain bullets and likes my handloads even better.
Edmo
However, if you will be sticking to 55 grain bullets (like most of us), I suggest a 1-9" barrel. Depending on the individual barrel 1-9" twist rates can easily stabilize a bullet up to 69 grains and mine loves both 45 and 55 grain bullets.
Below are two groups at 100 yards while I was sighting in a scope. It is out of a 16" Colt heavy barrel with a 1-9" twist. The ammo is bulk Federal 55 grain FMJ.
Not bad accuracy from a barrel I bought in the mid-80s which has more than a few rounds through it. Although it isn't the latest military twist, it apparently spins them fast enough for 55 grain bullets and likes my handloads even better.
Edmo