Nice grouping I admit!

I've got a 6-shot 617 with a 6" barrel. I've recently added a Weigand weaver-rail and a red-dot sight instead of the rear right.

I'd really like to ask whether you actually clean the bore everytime you go shooting. I've noticed that accuracy drops slightly when the bore is mirror-clean - it actually prefers a "dirty" barrel. It takes a few cylinders to "restore" the accuracy. Just my observation.