.25 Leshiy Classic and slugs?

Anyone tried shooting slugs out of their .25 calibre Leshiy Classic?

Mine is shooting the JSB Kings beautifully at ~850 fps, but I’m a little tempted to try the lighter Zans at this setting.

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I have a .22 classic and had some .217 nsa 20 0r 21g I can’t remember which and they wouldn’t even fit in the barrel only pushed in half way and got stuck and had to use a pair of pliers to pull it out
I know this is an old thread but did you manage to figure out what size slugs your leshiy liked? I tried the 217 17.5gr slugs they practically fall about a 1/4" down the barrel but they need to be pressed so they dont move around. I'm thinking of getting them in .2175 and thought about getting the 20.2gr but from your comment I'm likely to refrain from doing so.