ollie said:
Devcon Plastic Steel Putty A - 10110 SEPTLS23010110 (78143101106)
Google this and it will help
Yep. Way better than acraglass and no shrinkage at all. DO NOT get the Devcon Steel "Epoxy" from midwayusa.com
It's a solid bedding compound, but it's consistency is like "slimy soup" and is very hard to keep in place in a stock because it flows too easily.
Get the Devcon Steel "Puddy" with the number "10110". Consistency is about like warm creamy peanut butter. Which is just right

And you wont get the bubbles in the dried compound like you do with Acraglass
You can get it in a 1lb. container on ebay for around $50 shipped. Don't think you can get it in smaller quantities...But even if you don't bed a lot of rifles, it's still well worth it IMO.
AND only use "KIWI Neutral shoe polish" for a release agent. Works extremely well for releasing the gun and cleaning it off the metal is a breeze. The KIWI releases the rifle from the bedding 10 times better than that crap that comes in the Acraglass kits and is also way easier to apply on the metal surfaces.