I too love the .32-20 cartridge. It kills all out of proportion to its paper ballistics. In the south, these guns were the standard "hog rifle" of yesteryear, the gun that went everywhere and did everything! Imagine shooting 350 lb razorbacks with that little 100 grain pill at 1200-1300 fps! Yep, that's what they did with them.
As mentioned, have your rifle go through a thorough checkup, then if it passes with flying colors, have fun with it! I have a load that I like that takes our 115g FN bullet to about 1700 fps out of rifles like yours... it is mean all out of proportion to what it sounds like!
Like all guns of vintage age, you will find some considerable differences in groove diameter of these fine guns. Most run about .313", but I've seen them as large as .315" as well... best to slug the bore to be sure. Fit a bullet to the gun and they usually shoot very well. Also, use just one manufacturer's brass for handloading, as the brass length is different for Remington and Winchester, either will work, but you'll not be able to interchange loads because the C.O.L. will be different for them due to crimping the bullet in the case mouth. Also, stay away from the Starline brass in this cartridge... I do like Starline's quality, but the dimensions of their brass make it quite short, and most dies won't even crimp it becuase of its excessively short length. (A lesson learned the hard way)
Enjoy that old hog rifle!
God Bless,
Marshall