I have used both Devcon and ProBed. They both work well, so don't feel bad using the ProBed.
Tips -
I put blue masking tape on the sides of the rifle stock up to the edge so that I keep the paint clean. You can remove it once everything is clean.
I use studs (cut off bolts) in the action screw holes, and wrap them with blue tape to help center them in the action screw holes. It also helps keep the action straight.
Bedding material is usually stiff enough that you can flip the rifle over and clean inside the magazine well, etc while the material is still pliable. It makes later cleanup easier.
Eventually you will find out what needs clay in the holes, and what really doesn't. You used plenty.