While I was out starting to parboil, I did try some of the Steve Brooks

bullets.  Some were ok, a couple blah, and then this:

Which is the tightest group I've ever fired from this rifle.  The first four are under 2", the last, which I think I pulled opened it up to a touch over 3.5".  Oh yes, I will be trying this combination again; if it gets reasonably close to the first four again, I will get up and dance by the bench.