You know reading some of these posts led me to this one
Ruger 10/22, never in my life have I had so much fun as to shoot the ever living snot out of one of these rifles. Seriously. 1 brick is 550 rounds and cheap as heck. So its up to you...1 brick today?...2?.......3
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After that little guy I would suggest:
Winchester 94 - Amazing handeling, very rugged, pure American. Cranking the lever on that rifle will bring a smile to just about anybodys face!
8mm Mauser - Any (SAFE) one you can get your hands on! Just dont sell the rifle short, go ahead reach for 800 meters you will like the results.
Bushmaster XM-15 - This rifle is a M16A2 lookalike, minus the barrel twist and 3 round burst. Its very fun to target shoot, do quick action drills and heck just plink old tin cans. In all fairness I believe its the platform that makes it so much of a joy to shoot, so any AR will do.
Arsenal SLR107 - AK by any other name, the milled reciever lends itself to greater accuracy (please hold your laughter). The rifle is decently accurate up to 300 meters and if barreled in .223 you can step up that range to 400.
Springfield M1A - King of my list; rock solid handeling, wicked accuracy, intimidating firepower AND a 20 round magazine. Whats not to love?