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22 CAL Knock outs

. . . following this one. I've an S510 also and frankly it just doesn't have the horsepower to push anything much bigger than a 17.5 nsa. Beautiful gun - wish they were tuneable / tweakable though. I've pretty much bagged any slug aspirations for it - it's strictly a pellet shooter - and a damned fine one at that. ( jsb 15.89 and 18.1's in particular ) Slugs? Not so much . . .
 
jdanvers,

have you tried Griffin slugs?

He makes them down to 15 grain, and several slug models at such low weights (.22).

I haven't found THE elusive slug just yet, but I do need to do more testing & tweaking before I can accept a verdict as crushing as "unsuitable for off-the-shelf slugs" for my Skyhawk.

Matthias