[vindicareassassin]

I'd expect about 550 fps, with a quite heavy trigger pull, depending on what your used to.

With a good clean of the barrel and a stock TM hop rubber and arm I guess about 12" groups at 70 metres with the occasional flier.

None of this is conclusive though, as it really depends on how well you nail it together and then set it up

 

[vindicareassassin]

I've got a pair of strong grasps so I don't actually think pulling the trigger will be that much of an issue

You'd be suprised, my 500 fps CA M24 had a 90 degree trigger (similar to a zero-trig) and that used to give me cramp through the palm of my hand, and I passed the fire brigade grip test by over 300% because of my job swinging a hammer around all day :-/

The VSR on the other hand still has a 45 degree trigger and at 500 fps its still reasonably easy to pull without pulling the shot off kilter

Best bet is wait and see, like the lads said if its to heavy, knock a couple of coils off, you wont realy notice the loss of 50 or so fps, as 500 is fine for what we do even with a .4, as thats what most of the lads over here are using in their rifles at that power