ALL of them!
The first cartridge that got me into it was .45 ACP. But I reload for everything I own, except shotguns. Care and feeding of a Ruger .357 was next. I also have a Ruger Redhawk in .45 Colt that I load to the "quite hot" level, which will do everything the vaunted .44 Mag will do. I also have an M1 Garand that won't shoot just any factory .30-06 round on the store shelf, so THAT'S been something of an adventure. Learning to make 8x57 Mauser brass from .30-06 has been my latest challenge. I'll need a sturdier press to go much further.
BTW, if anyone has "pet loads" that they'd like to share for any of the above, I would welcome their input. Just because I get satisfactory results (usually) with what I've put together doesn't mean I'm averse to their being improved upon.
The first cartridge that got me into it was .45 ACP. But I reload for everything I own, except shotguns. Care and feeding of a Ruger .357 was next. I also have a Ruger Redhawk in .45 Colt that I load to the "quite hot" level, which will do everything the vaunted .44 Mag will do. I also have an M1 Garand that won't shoot just any factory .30-06 round on the store shelf, so THAT'S been something of an adventure. Learning to make 8x57 Mauser brass from .30-06 has been my latest challenge. I'll need a sturdier press to go much further.
BTW, if anyone has "pet loads" that they'd like to share for any of the above, I would welcome their input. Just because I get satisfactory results (usually) with what I've put together doesn't mean I'm averse to their being improved upon.