Likely hunting with a semi 308, and only have 20 round mags for it. Any reason it would not be ok to fit a block of wood inside the mag to get it down to 5 rounds? Id rather not spend $30+ to geta 5 round mag, and apparently dowels stuffed in shotgun tubes is legal for those, to get down mag capacity. Obviously dont take any other mags with me either, but Im thinking this should be fine?