Re: making a laminate stock.
Slewfoot, the problems with trying to use plywoods is even the best grades use less than perfect quality veneers for the inner layers, plus the glues that are used will not do well in the elements. Delamination is always an issue.
If you have a source available that can order directly from Rutland Plywood (the largest supplier to the rifle stock industry) their blanks are made from solid birch veneers and epoxied together vs standard glues and under high pressure clamping system.
I sell figured and exotic hardwood lumber (I used to own Curly Woods) and have been around the industry for many years.
Stick to an established and proven product(
Rutland Plywood) if you want to try to make a stock yourself.
If you attempt to make a blank like the one that I made, you have to be extremely painstaking in your preparation of the materials, glue choices and have a lot of good quality clamps available! I used 19 Bessey K-Body clamps for my stock lamination. My wood was not plywood though, I used dimensional exotic hardwoods and planed/sanded them to the final thicknesses that were required for the look and stock pattern that I had Joel build for me.
Different glues have different "working times" so it is best to fully understand their pluses and minuses well. Some will have more "open time" that allows you to work a little slower while others have very little "open time", but have superior bonding strength and resistance to environmental changes.
As in anything research and practice before making a final decision. I wish you the best in your efforts. It can be done. Just try to master each step before leaping