For me the 454 was a "safe" 45 Colt. The benifit of the SR primer sparking the larger charge of hard to ignite ball powder is a good one! I have long been conserns the hot colt loads with find there way I to a expensive colt model P.
I did not want top loads. My 45/70 does that and at lower pressures! Starting loads for the pistol 454 shoot great and reach my velocities I want to reach.
One bullet I will say avoid, 200g FTX at 454 velocities. Will blow up! The 225 FTX is made for the long colt BTW. I'm gonna try the 250g. This should work as its used in muzzle loaders and that's the same vel range. Also most bullets are not constructed for 454 velocities let alone rifle 454 velocities!
CW