Starline is the best. I've also bought Winchester when it was available and cheaper, and it's good too.
You can probably shoot .44 Magnum handloads loaded down to .44 Special or .44-40 or .45 Colt levels. My club has the same rules about shooting indoors or on the pistol range (you can shoot whatever handguns you want on the rifle range) and they allow downloaded ammo -- especially if you use lead bullets.
"The only way to stop a bad guy with a gun is with a good guy with a gun"