Went to the range today and tried No Excuses bullets sizing pack. Shot the .500. It started with thumb pressure and was fairly easy to push down. I bounced the rifle, muzzle down, a couple of times to see if the bullet would come off the powder. Took a pretty good whack, in excess of anything I've accidentally done in the field, to get the bullet off the powder 1/4" or so. Light bounces and the bullet stayed seated. The second .500 (I ordered two sizing packs) went down the dirty barrel tighter, but still only had to use the rod, no starter. So a followup shot with a .500 is not going to require a spit patch first.

Cleaned the rifle Then moved up to .501. Started it in and came to a hard stop at the lands. Tried to push in into the lands with my thumbs with great force, couldn't and pulled out the starter and push it in about half way. I knew I was going to have a helluva time getting it down the pipe. So I used my bullet puller to get it out.

Never dreamed .001" would make that much difference.

So .500 it will be. I ordered two boxes of .500 460 grain.

Here's the .501 I had to extract with the puller.

[Linked Image from i.imgur.com]