I wouldn't waste my time trying to bed a thermoplastic stock. Nothing you do to it is going to make it very stable, and the bond between any bedding product and the stock is just not going to be very strong. I just did a Howa using Score High's new Howa pillars and am really pleased with it, but it is in the wood Boyd's stock. If you really want that Howa to shoot I'd recommend buying a proper stock for it, either one of the Boyd's ones or one of the new McMillans. Something that can be properly bedded and isn't going to keep moving on you.