Ooops.
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Ideally if a nose and or tail fuse is present a “rocket wrench” is used ..... Police are usually just a HDT team. Military Ordnance involved is usually a military EOD mission ...... just a SWAG (scientific wild ass guess) I did hundreds of these WWII as well as WWI and cannon balls found in Europe etc etc ....... the safest way was to BIP (blow in place) the devices after evacuating the area . Each piece of old ordnance is still deadly .
Glad no one was injured ....... Stay Safe Lurker !!!!