How much FPE in .22 caliber does your gun produce for HEAVY SLUGS ?

In 22 caliber 77.6 foot pounds from a Daystate 303 thats been converted to 22 cal.

Shooting a 40 grain swage slug at 935 fps and its quiet also at 67 db .

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Is that a Ronin that brought it down to 67 db?

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Yes Sr it is a Ronin , it does a great job on keeping it quiet . 

My bullboss .22 has 43 fpe when shooting 27 grain Nielsen slugs at 850 fps. 

Now closer to the OPs original question I also cast the 5.55mm MP mold 

and shooting through another modified Wolverine 303 it's shooting the 

35.3 grain slug at 1040 now thats 84.8 foot pounds and I think the gun has

more to give but not much more , This gun has had extensive work done on 

the valve and the transfer port through the titanium block has been opened up 

it took 3 hours of machining and a couple cutting bits . 

Huben is about 80fpe .22 gun out of the box and will send any known pellet supersonic. Most people detune Huben to upper 60’s fpe to send 33g beasts at subsonic velocities of about 970fps.