Thinking of using a cdi bottom metal on my 116 it is a newer one originally a 300 Wm changing it to a .260 but noticed on the new 116 they only offer 300 Wm mags and 338 lapua they offer bottom metal and mags for the older 116 offer a 308 mag does anyone know if the older style will fit or will the 338 mags fit the 260?