H&N Slugs through my .22 Hatsan Flash

Shot some slugs through my Hatsan Flash .22 tonight to see how they'd do. These are H&N .218 slugs from the sampler pack. I shot 21 gr, 23 gr, 25 gr, 27 gr, and 30 gr slugs, at about 15 yards. They all shoot to the right, as well at the .217 Neilson slugs I tried a few days ago. I've attached a pic of the 3-shot groups, and where they landed. FWIW, I have JSB 18gr pellets shooting hole-in-hole at this distance.

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I also ran the 27 gr and 30 gr slugs through the chrony, using the single-shot tray and the magazine. I've attached those results as well. Maybe I'm not pushing them fast enough?

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I guess I was hoping more for hole-in-hole accuracy, even if the POI wasn't the same as it is for pellets. I bought 2 different colors of turret stickers for my scope, so I can adjust on the fly. 

I don't have a longer range easily accessible to me, but I hope to get out to a longer range soon and do some more testing. I have done some 50-yard plinking with the Nielson slugs, and there's really no discernible drop. Pellets drop a few mil dots at that distance, for me.