450-

It's good to see you steering on to the right track.
Curl is right, roll crimps are easier than falling down - and any old antique ebay hand-tool will be enough to do the job.
The BP tool should give you good results.

On loading, won't you consider running good old fashioned Goex 2F powder?
It's very very consistent, gives excellent velocities, it's very easy to load, and it cleans up with plain cold tap water.

You owe it to yourself to give it a shot with these loads you're working on.
After all, you DO consider yourself a member of the "Whomper's Club" don't you..?

;-)

Cheers
Tinker