Seriously, Ian2005, 3"-6" at 200 yds? I supppose if I could shoot like that I would question the ability of so many people to hit a 1" target at 300 yds.
ParaLTC, you probably will have to work up a load if you want to be consistent. Only way to tell is to try some of that SA surplus and see if it will hold 1/4" at 100 yds. Having shot thousands of ground squirrels, I can tell you it's a blast. Addictive. Did I mention fun?
You also will get very good at reloading or go broke. My buddy and I used to shoot 200-300 rounds/weekend, then spend the next weekend reloading, then go out the next weekend and shoot, then . . . you get the idea. It was very time consuming before I bought a progressive press. If you try that with factory ammo, it will cost you $150-200/weekend. With handloads, it's more like $35-40/weekend. Makes the $200 for the progressive press seem pretty insignificant.