by pitted bore » Fri Aug 01, 2014 8:55 pm
Colohunter-
I haven't tried Leverevolution in any cartridge. However, it appears to have an approximate burning rate similar to medium-slow powders. (It's ranked between BL-C(2) and H380 in Hodgdon's list. So, it probably won't burn properly in the 450B case. It might produce a weak "bang", and perhaps get the bullet out of the barrel. It might also not ignite, possibly leaving the bullet stuck in the barrel, with lots of messy powder granules to clean out of the action.
If you try it, let us know what happens.
You might try contacting Hornady or Hodgdon to obtain their opinion. If they respond, could you share their reply with us?
--Bob