I have a model Winchester model 70 with the magazine that has a ssping loaded cartridge cradle and clips into the a base plate that is hinged to the rifle stock. If you open the base plate with bullets in side of it they are free to fall out. This is a fairly old rifle that I still hunt with and would like to change out the cartridge holder to one that would actually house the cartidges in a clip in type case. My question is, does anyone have an idea of how I do this and where do I find?