OK First welcome to the board. Please feel free to jump over to the Introduction section
and tell us a little about your self.
Now my good man There is a HUGE difference in shooting at 100 yards to shooting at 600 yards. That difference gets even bigger at 1k. 1k yards is over 1/2 Mile you get this right?
I do believe that both the 20" and 26" barrels have the same controur I might be mistaken on this.
Now accuracy is not the only thing determined by barrel length. Muzzle velocity is also drastically changed with a barrel 6" shorter. In the 308 your going to lose about 20 FPS for every inch you lose off the barrel so you are already being the 8 ball losing 120 fps by going from a 26" to 20" barrel. As far as not packing a 26" barrel around a field if that was not to happen then where are there sling swivel studs on my Remington VLS? I packed that thing all over god creation ground hog hunting. I rig total is 13+# that is VLS Nikon Monarch scope sling and 13-27" bipod 6 rounds of 223 in the mag and chamber and 6 more on the but. But I digress.... The 308 while capable at targets at 1000 yards is not the be all end all 1000 yard shooting cartridge
. There are tons of different calibers out there that are much better suited to shooting long distance. The big thing in shooting 1000 yards is to make sure your bullet stays super sonic all the way to the target. A 308 has a very hard time doing that even with a 175 gr bullet. You should have a 10" twist barrel on a 308 for shooting 1k this is to allow for shooting 175 gr and up bullets to help keep it going super sonic out to 1k. What are you talking about keeping it super sonic. When a bullet exits the barrel it is going faster than the speed of sound. As it travels to the target it slows down. When we get to 1140 fps (Roughly the speed of sound at sea level). It transitions to sub sonic and can be come unstable from that.
Shooting a 308 at 1k requires many things. Good rifle, great scope, and a great shooter. How long have you been shooting? How far do you shoot? Do you have access to 1000 yard range? Not many people do.....
If your stuck on a Remington get a 700P with 5r rifling. If you are not then get the better rifle in the savage LRPV or F-class rifles.
Now if we can stop acting like a bunch of kids fighting over the last cupcake I think we can still salvage this thread.
PS I have a buddy that is shooting a 6mm dasher and hitting a 18" steel at 1 mile.