.22 Redwolf and other HI -powered .22 caliber guns I need info please

I have my .22 HP Redwolf tuned to "just under" the maximum velocity (while still giving a regulated shot string). It's shooting 25g pellets at 950 fps for 50 fpe. You can push the gun higher/harder than that, but the result is a declining shot string.

I tested these tiny Rat Sniper hollow point slugs (22.6g) out of my RW & initial results were very good. 

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I didn't do any chrony work, just rang a few steel targets from my porch.