As long as you keep the velocity down, proper sized cast bullets shoots real well without any lead fouling problems, but push em too fast and you're gonna want gas checks. I've shot a ton of gas checked smokeless loads in my .45-120 BC with no problems, I did shoot some T7 with 500gr cast bullets, they leaded the barrel real bad.
I would recommend you slug the bore to see what size bullets you need, most use .459" or .460", but slugging wiill save you some time and money, I've seen a couple barrels reported here that had inconsistent bore diameters that were too open at the muzzle and didn't shoot well, but most shoot excellent. Bernie(Dodd3) shoots cast bullets in his BC to 800yds, and dang well!!
Recoil from the bench will be a non-issue with a little pre-emptive planning, some weight in the stock bolt hole and a Limbsaver small grind-to-fit or slip on pad and you're good to go.
Tim
http://www.castbullet.com/shooting/1871.htm