My grandfather recently gave me an old Mossberg .22LR semi-auto and an old Springfield/Savage .410 shotgun (bolt action with 3 round mag). In addition, he also a couple boxes of old ammo for them. Here's the problems: The old ammo in the Mossberg tends to jam every couple of rounds. I bought some new ammo and there doesn't seem to be any problem with them, so I'm assuming the problem is with the older rounds. I've been told that applying a little bit of oil to the old rounds will help clear up the jamming issue. Is that true? Are there any other tricks anyone would recommend for the older rounds? On the .410, I think I know what the problem is, but I am hoping for a second opinion. After firing a shell, the spent casing is not ejecting from the chamber, so I have to manually pull out the casing before I can load the next shell. It didn't occur to me the other day while I was shooting to check on the size of the shells I was given. But sure enough they're 2.5 inch shells and the shotgun is a 3 inch barrel. What I'm wondering is whether or not the wrong size shell would account for the casing not ejecting or if maybe I'm looking at a problem with the bolt assembly. Anyone have any thoughts? Thanks.