The problem is not only the removal of the berdan primer; there are numerous primer sizes for berdan primers. There is no standard for them like there is for boxer primers (small pistol, small rifle, large pistol, large rifle) -- in most cases you will find that a standard size boxer primer will either be too large or too small for the berdan primer pocket .. I have seen people use boxer primers and then coat them with fingernail polish to hold them into the case -- way, way too much trouble for the gain!!!