If your gun is from the early 60's or before you have chokes that were regulated for roll crimp shells, that makes them even tighter that what they say if using star crimp shells. So if you 10 gauge is older and says it is Mod. and Full, using star crimps it will pattern like Imp Mod and extra full. Since you are talking of loading your own, putting "X" shaped inserts in the shot cup will open you up about 2 choke sizes. So the your older gun will shoot like a Improved Cylinder and Mod gun with star crimps. While this would be fine for upland game, That is a lot of gun, although I have seen people do SxS Sporting Clays events with shot 10's (7.5 & 8 shot). If you are hunting water fowl or on Federal lands, you must use "non-toxic" shot. Steel shot and the tungstens don't go with the old guns with tight chokes, so you will be using Bismuth. That stuff is pricey, but loads the same as lead shot. I use it in my older 12 gauges. Fluid steel barrels with Modified or more open chokes can use steel shot. I had an earl 50's SxS that an earlier owner lapped the chokes to Modified on both barrels, best medium range goose gun I've had.