Yes the 45Colts and "long Colt" are the same .

The 454 can be loaded in 45 Colts dies just as 357s can be loaded with 38 Special dies . The 460 is about a1/2 inch longer and requires at leastits own seatingdie .

All 3 in modern arms shoot 451-452jacketed bullets and 452-454 cast .

I would recomend the new Lyman manual . It is very complete and covers many bullets and many manufactures .

I shoot a 45 Colts Ruger Blackhawk 7.5" with 9.5 Unique and as cast 255gr LEE rnfp (it weighs 260) it get just shy of 1000 fps .