Snowpeak Slug testing with the Snowpeak M60B

Got the .217 HN sampler and .218 HN 23 gr today. Did a 24 yards test. Looks like the M60B favored .218 slugs.
Not only it picked up a little more speed with the .218 slugs it also tightened up the group. 6 shots on each dot. I also noticed the first shot is always gonna be a little off when switching slugs. And yes the slugs dirt up the barrel quickly. I clean my barrel every 200 to 300 shots.
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Got the .217 HN sampler and .218 HN 23 gr today. Did a 24 yards test. Looks like the M60B favored .218 slugs.
Not only it picked up a little more speed with the .218 slugs it also tightened up the group. 6 shots on each dot. I also noticed the first shot is always gonna be a little off when switching slugs. And yes the slugs dirt up the barrel quickly. I clean my barrel every 200 to 300 shots.
View attachment 441670
Those look like tight groups. How do you like the M60b so far?