Thread: 6.5x55 Barrel Length

I'm about to chuck down money on a GunWorks suppressor they have going for $517.50. I'm thinking of having my barrel length shorted so the suppressor is 5mm from the end of the stock.

Two things:
This would make my barrel 18" long With a 5" over hang so about 2" further forward then the standard barrel.

I don't have my chrony any more as I stopped using it and thus sold it. But what fps loss should I expect?

IIRC I was getting 2730 fps with 140gn Amax's

Note: I would like to be able to kill red deer to 300m, 400m would be nice.