Sorry for the late come back. I just noticed your post.
I have not done any more shooting with bullets in the Simson to date. Honestly, the 1350 fps loads pounded me pretty well and I have no intention of shooting the 1500 fps loads (even though they are at the same pressure spec). I agree that slower (around 1100fps) would seem appropriate and as the summer shows up I will screw with the gun again.
I just purchased a chronograph and one of those kick reducing rifle rests so hopefully those items will help clarify what the gun needs to shoot before deer blasting season this year.
I still have to get some bullets and that will be my next item to procure.
