I shoot a Savage model 12fv chambered in .22-250, and I am in the process of finding a recipie that this rifle likes for hunting prairie dogs. I have reloaded now for about two years, using several rifles chambered in a variety of calibers so I am pretty familiar with the whole process. My old man and me were talking the other day and he said that it might be better test to shoot groups with these different loads at 200 Yds. instead of the traditional 100 Yds. Is their anything to this thought process, or is 100 Yds just fine or even more preferable than 200 Yds.?