As noted when you scroll down to the load you want there is a NOTE OF CAUTION WITH THE .452 JACKETED BULLET..Looks like a very high pressure load to me.
I cannot find a load in any of my books for a .452 bullet OTHER THAN LEAD... All jacketed loads are for .451 bullets..for handgun rounds...
That bullet if it is .451 may of been developed for the 45 win mag "winchester magnum"case,the LAR grizzly was the first gun IIRC to chamber that round
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