Daystate Delta Wolf .177 HP - JSB 13.43 gr pellets at 75 M - 82 Y

I never realized the amount of vibrations and noise that the gun generates when shot. And it's still accurate.
I do love mine, 99% of the time.
I think it is due to the single back side supported scope mount. I get the same vibration in the scope but you don't really feel it in the gun. The higher the power the more the vibration too.

I might have to try the 13gr RDs again as I had no luck with them past 50 yards in my 177 23" AW. Was pushing much closer to 900-920 though, but my barrel just didn't seem like a fan.

Now pushing the 16gr pellets at around 900-940fps they shoot just that tight at 50 yards. I believe they will extend out further better, but have't had a chance to try yet.
 
Sean - makes sense on the vibes.....

I shoot the FX 13.4 at 818 PFS - just below the field target limit of 20 ft/lbs. That seemed to get me decent groups and results.
I tried JSBs offerings, the RD did not work as well as the original design, so I went with the FX that look the same as the original JSB. They are/were easier to secure and cost less than the JSB.