I use a Harris bipod on my rifles. It works very well. As for ammo selection, each rifle is unique. You will just have to try every kind you can find and see which one shoots best in your rifle. You should be able to get 3 to 5 shots in a 1" or less group at 100 yds on a calm day once you get it sorted out. It may take several trips to the range and even some accurizing like free foat the barrel, lighten the trigger, or rebed the action. Or it may shoot just fine as is once you find the right ammo.