Smooth Twist X Barrel (380mm) slugs (with results)

**New test updates at bottom**

Rifle: FX Crown Mk1 380mm Smooth twist x barrel

Current set up is JSB 18s at 870-910 depending on my power setting.
I shot some of my H&N .217 21 and 23 grain slugs with good accuracy out to 75 yards. I will preface this with the reason I am looking at slugs is the increased BC due to the fact most of my shots at my permissions at 50-110 yards. (I know you can do this with pellets, as I currently do but looking to see if I can gain some added advantage.)

Has anyone else tried .217 slugs of any brand or weight and had good accuracy out to 100 yards with a 380mm smooth twist x barrel? I am only looking for information/experience with this exact barrel and length. These tied the accuracy I get with the 18g pellets which is why I started considering them in the first place. Less drop and better ability to buck wind with the same accuracy at range is a big plus...

All I need is about MOS (Minute of sparrow) to be effective here, I will likely stick with the 18's unless I find a slug that wows me, but figured I would ask the airgun nerds to see what you guys have tried!

Here are the results from my trip to the range today. I didn’t do this for ultimate group accuracy I just shot like I do whe. I’m pesting to try and mimick the scenario.
I shot at 50Y on two different power settings with each projectile and measured the group sizes from each.
Then I shot at 75Y on my high power setting.
I then shot my JSB 18s at 100yards along with both slugs at my 2” spinner. The 21gr seemed to spiral out some at that range, the JSBs did great and I landed 5/10 shots hardly missing with the others. The 23gr though did amazing and I hit it 9/10.

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