Sorry if this has been asked over and over, but I'm getting ready to buy a rifle in 308 Narrowed down to 700ltr 700 5r, and the 700xcr long range tactical, or compact. I'll be shooting 500 meters, my range can be a little windy at times. What are your opinions. Will 20" work, or should I go all the way to 24 or 26 inch. and does anyone have an opinion, on the 700 pss dm.