Today I took the but plate off all my long guns and drilled holes big enough to add extra rounds. My drill bit would only go far enough to add 6 rounds of 22LR. I had to drill 2 holes. I was suprised to see that my H & R single shot 20 guage, was already drilled big enough for 3 rounds. That's how the stock was installed to the frame. I did put foam earplugs between the rounds to keep them apart and to keep them from making noise. Be sure that if you do this to your H & R, use foam before you put the first round in and drop the first round with the primer facing you as a safty percaution. The stock mounting screw could hit the primer during recoil of rough handling.