Those fillers, like epoxy, will work OK as long as there is no real strain, but they strip pretty easily if the screw has to be torqued down or if it has to hold against pressure. Scope mount screws take a lot of strain when the rifle is fired and the recoil tries to jerk the rifle out from under the scope. On some high recoil rifles, it is common for gunsmiths to drill and re-tap for 8x40 screws on brand new rifles just to keep the customer from having broken off screws later on. (The worst case is a light rifle in a big caliber and a large scope; that combination is brutal on scope mounts and screws, as well as on the scope itself - not to mention the shooter.)
Jim
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