after you get your perfect shot.....DON'T CLEAN THE BORE
leave it fouled. put it away for the next time.
The rub is that the only 'cleaning' is running a boresnake through it (with a small amount of hoppes9 on the brush section and a small amount of rem-oil on the snake a foot past the brush, which I only apply once every 15 or 20 groupings) - and I've been doing that after every 3 shot group, as well as when putting it away. So, I think the only difference between the first shot of the day and the fourth shot, for instance, is that the barrel is cold. Make sense?
The reason I bore-snake it between groups of 3 is that I get better groups. I had been snaking it after every 6 shots, but the 2nd 3 shot group was always more open than the first, so I changed to snaking it after each 3 shot group.
By the way, it's about 6 or 7 minutes between each 3 shot grouping. I've been walking down to the target and measuring and marking each group to give it time to cool a bit because it was getting really hot to the touch when I only gave it a minute or two.
EDITED TO ADD: Not sure that it matters, but I've been only been shooting starting manual loads through it because this handi shoots the mild loads much more accurately than loads nearer the max listed loads. I've had good success with 95gr ballistic silvertips over 39 grains of h414 with an oal of 2.79", and 55gr ballistic silvertips over 40 grains of h4895 with an oal of 2.70"
Another interesting fact is that the bullet hits the rifling at 2.85", but none of my loads at 2.825" grouped very well. In most of my other guns I just take it .02 off the rifling and tend to get best groups, but not this handi.