dongun The 454 was invented due to the 45LC was and is a good load but can only operate at lower pressure's due to case thickness 32,000, So Casull in the 1950's wanted to increase the power of the 45LC in tern made the cartridge 5,000 longer and increased the casewalls as well, this greatly increased the pressures to 52,000 and could really put out much more power, The 44 mag for the longest time was the king of Mag's , until the massive power of the Casull was introduced. This round has been around for many years, a sleeper as I call it
Using a 300gr XTP
at 31.4 WW296 using the SuperRedHawk 454 Casull 7 1/2 1680 fps using the Puma 454 Casull 20 inch barrel 1920 fps this cart eats the 44 mag up and spits it out for over all power,even when the 44 mag is using a 240 gr XTP. For a shot stout round shoot relatively flat for a good distance 100-150 yards a short to mid range brushgun, The hot loads for the 454 Casull handgun seem to be a little to much to control, using the more moderate loads are much more controllable and still chewup the 44 mag at its max loads. (I really like this cartridge over all. WW296/H110 are interchangeable and seem to shoot the best, of course there are other powders you can use, this is just my observations reloading this cartridge. The 454 Casull uses a SM rifle primers and a good crimp is important also, due to being either a revolver or tubed fed bye the Puma 454 Casull. Don when using the 454 Casull revolver shooting 45LC be sure to clean it well before using 454's, there is a buildup from the 45LC's and the 454 are longer and may get stuck or have a hard time extracting, note: I have noticed using Hornady 300 gr XTP's in a SuperRedHawk the shells are very hard extracting and sometime will not extract at all you need to push them out one bye one,not good
This could be a soft brass problem not sure and hornady said they did not have this problem, but notice even my Puma draged also, these are the hottest factory loads out there, Using Winchester Partiongolds 250 gr worked great and shot very well and still had plenty of poop to boot, and they are cookin 2180 fps out of the Puma and 1880 out of the SuperRedHawk. Note:When reloading and buying bullets be sure to as for .452 Mag if it don't say Mag on the box its a 45LC and the profile is shorter than the 454 Casull's, some have double catalures just a heads up
im not a expert but have done some reloading and testing of this round and these are my findings, hope this helps. Aim small hit small. RAMbo.