I will have another wee polish when the Tinbum bits arrive. I've also ordered a new pair of piston rings so will see what fldifference those make.
I had half hour and 40 odd shots today.
Most importantly, we're running just about on 11lbs, dropping a tad below, so that's a huge relief!
I cleaned the barrel pretty ruthlessly so it will take a while to lead in, it will take a long time to get used to the recoil too.
I could do with trying a very well tuned one to compare, and I will dig out my Remington Express to compare a cheap nasty one.