TCall, I've been down your road with three different rimfire barrels in the last year, and looking back, I'd do it differently. All three barrels changed tastes and drastically improved accuracy on getting shot in. I shot up a lot of very expensive ammo in the process without getting results that meant much.
Since you've found cheap ammo that gives you very acceptable accuracy, I'd suggest you go with it for a while. Run a few bricks of Golden Bullet through that barrel and then do your accuracy work.
Something to look out for when you do get around to working with the standard velocity stuff is that not all lubes are compatable. The first few groups from a box may not be representative. Some real finicky folks clean between bullet changes. I clean when switching from copper clad to lubed lead, but when switching brands of lubed lead, I just don't put a lot of store in the first few groups. It often takes 15-20 rounds with a particular brand for it to start working well.
Took me a long while to realize that firing a couple of groups and going on to the next brand really wasn't telling me a lot. The targets I use have six squares and these days I shoot at least one full target before switching brands.
