Well, I picked up a No. 49 drill the other day. Drilled a divot in the spent primers with a 5/32 drill and then drove an awl through the divot wall and pried out the primers. About a third of them popped right out and the rest required varying degrees of elbow grease. I clamped the shells in a large vise with an old synthetic shoe sole to avoid marring the brass. I'll full length resize anyway which should fix any out-of-round issues.
I drilled out the small flash holes with the No. 49 drill, which is a bit small, but the holes cleared a large decapping pin. Out of maybe 40 cases there were 3 that had large flash holes.
Mixed in with the 7mm brass were some rimmed cases labeled 40-32 WRA and some marked .43 Mauser, a brass .410 case, some brass 12 ga. cases and a case like a .50 M2 but a bit more than an inch shorter with a L C headstamp.
I've heard of the hydraulic decapping method but have never tried it. Might if I can find some Berdan primers....the find included about 100 ?Turkish 8 x 57 Berdan primed cases.