Cast Bullet and Trail Boss loads in my .458 Win Mag

here is the recommended method for determining your reduced load using Trail Boss
 

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I didn't see it listed on the link but I recall reading somewhere that trailboss is NOT to be compressed. It can be loaded up to 100% capacity, but no more than that.
 
Graeme Wright found out the compressing Trail Boss was not to be done
 
Have you tried Alliant Unique? It works well in straight walled cases. My old Lyman 45th edition has cast bullet data for the 45-70 and 458 winnie. I generally load 16 grains behind the Lee 405 grain in the 45-70 and 21 grains behind the Lee 500 grain in the 458. I haven't chono'd these loads but both should be going 1300-1400 fps. The 458 is a Ruger no1 - obviously no feeding problems. But I sometimes load the Lee 500 grainer in a 45-70 Winchester 86. Again no issues, flows like water through the rifle.
These are not compressed loads in either cartridge. Also, Unique doesn't require a wad to hold the powder charge in place as some powders do.
 
Terry Wieland in his book "Dangerous Game Rifles" is a big fan of 5744 for reduced loads. You find the load the same way as with TrailBoss except with 5744 the multiplier is .40
 

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