I have read a few guys saying they can get one inch groups with .177 using the panthera ( on a calm day ) at 100 yds. I have seen the M3 Compact do it without modification in the .22 version. My whole reason for this gun is hunting in wooded or thick areas quietly. Trying to do that with a gun the size and length of the Panthera, would be ummmm Troublesome LOL. The size difference due the bullpup design of the M3 makes it ideal for such an endeavor the length of the Panthera is an entirely different matter.Panthera is really made for slugs and contrary to some people's opinions FX 177 barrels shoot slugs very well. My crown with "short" 500mm barrel can shoot 12.5g NSA 900+ fps. Go for it, no reason not to. Just don't try to tune for slugs with low reg pressure like 90 bars, generally speaking I leave my regs at 140-150 bars on my FX guns. Sadly the 15 grain NSA only has BC of 0.075 vs 0.07 of 12.5 grain so I didn't bother with the 15 grain NSA.
Also contrary to some people's opinions you don't need 1000fps to shoot slugs accurately. If the wind isn't bad I was plinking soda can sized steel targets at 220 yards......with a 380mm 177 barrel on my lowly crown.
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