If 100 yards is your limit, then I think Ammo.crafter has hit the nail on the head. The Triple Deuce (.222 Rem) was the darling of benchrest competition for a long time before the specialized wildcats for that discipline came along. My Remington 600 in that chambering will drill cloverleaves with 50-grain bullets all day long over 18.5 to 19.5 grains of 4198. For something that has commonly available components, including brass, it is hard to beat, given your requirements, and not too expensive to shoot, as centerfire rifles go. Just be aware the 14" twist is not suitable for most bullet designs weighing over 50 grains. When I was shooting mine a lot, I found it did not do as well with the Sierra 52-grain boattail MatchKings as it did with flat base 50-grain Hornady soft points, despite their cannelures. If I were developing the loads today, I would look at the Sierra 40-grain Varminter and Blitzkings, and also at the Hornady 40-grain V-max. And, indeed, I picked up a box of 100 pieces of bulk brass not too long ago, and expect to be doing exactly that.
