Anyone had any luck shooting slugs in .177cal springer?

Just curious since ZAN and JSB have come out with their 10 grain versions.
Thanks in advance for any info.
My 177 bone collector loves nsa 12.5 and nsa 15g is ok, my rws diana 34 also loves nsa 12.5 and lastly is gamo big cat in 22 cal really likes apolo 21g, the idea that you need high spead for slugs is totally untrue.