Well, it sounds as if you want to get it right the first time, so let me recommend this combo: 4x5x7 Nitros and a Jelly Head .660 choke. Sure, you'll pay $130 for 25 shells but you'll be set for a few years and the Jelly Head will run $40 tops. If you shoot 7 of the Nitros per year they'll last you 3 years. That's $40'ish per year if you break it down. I'll guarantee you that you'll spend more than that if you buy 2 or 3 boxes of ammo per year trying to find that load that'll shoot just a little better than before. I'll also guarantee you that you won't find another shell that'll shoot any better either. You'll go broke trying to beat it.