Same here, also with jsb 18 grain at 860. One hole groups at 50m.Weird. I can easily put the JSB Monst. Red. hole in hole from 880 fps to 970 fps @50y. Tell me more.
Slugs, Zan 23g 218, h&n 27g 218, and knockout 217 are showing promise, not tested beyond 65m. Winter and weather.
For now I'm sticking with pellets, it's super accurate. Slugs can wait.
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