Gawdzilla Sama
TImeToSweepTheLeg
We wouldn't consider firing those, however. I hope.We had a few problem with live ammo from WW1 and WW2 in the region, thankfully in my parents garden it was only bullets, no bombs or large caliber.
The "live" ones are the ones where the powder hasn't been degraded by water or such. If you avoid banging them around you can deal with them without any serious drama. TNT, on the other hand...Our neighbor neutralized the WW2 bullet rounds we found in our garden/ground/wall also for safety before disposal. He did not tell us how he did it though, only that despite the decades in the soil some rare one were still "live".
The family housing area of the base I was on in Sicily was built over a German ammo dump that some SAS berk had blown up in preparation for Operation Husky. We were finding shells up to 40mm as late of 1975, don't know about dates after that, but it seems likely they'll still be turning up now and then.