I will try the marine resin/carbon arrow shaft style on mine. Also the expanding foam from Loews in the butt-stock...
Forgot to mention that the low expansion foam works best and use 3-4 partial fills with enough time in between to allow the foam to expand fully.
Slightly compressed styrofoam peanuts in the hollow butt works and is less messy.
It's a good idea to relieve the barrel channel as well.
