.308 barrel length and twist rates?
I''m new at this long range stuff, so to start, I am going the cheap route and getting a factory rifle in .308 to be used at 600 to 800 yards max. I'm leaning toward the Savage 10's but have researched other rifles and have a few questions. The Savage model 10's come with 20, 24 and 26 inch barrels with 1:10 twist rates. I have noticed that other varmint/tactical .308's come with a 1:12 twist and various lengths. My questions are, 1. What twist rate is better for accuracy at longer ranges? 2. Does the 1:12 twist allow for higher velocity than the 1:10? and 3. Does the .308 gain any performance with the longer barrel lengths? Basically, I'm looking for input on the best barrel length/twist combination, I need all the help I can get!! Thanks.