I like 1/7 best myself. That opens the doors to any and all ammo, without closing any. I've shot everything from the 40gr VMax up to the 90gr Sierra Matchking in the 20" 1/7 Colt barrel. They all work.
I have a three 1/7 barrels, two 1/9 barrels, and one 1/8 in the inventory.
The 1/9 stabilizes some of the 75/77gr stuff, but the 1/7 is more accurate with it.
My 1/8 is a bolt gun. It works fine with all the 75/77gr stuff.
+1
Depending on your luck and who you get it from, a 1/9 can be really hinky with 75s. Sometimes you'll get a barrel that is rifled slower than advertised. Rifling buttons sometimes slip and yield a slower twist.
I wouldn't waste my time on one unless I was absolutely sure I was never going to shoot anything more than a 69 Sierra.
