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correct, like this...

http://www.pyrotalk.com/bulletin/attachment.php?attachmentid=5983&stc=1

In my experience, it is not the fire ball that cased the freakout (our yard is surrounded by tall pines and it was a single 4" mortar), but the amazing smoke ring that lingered for about 45 minutes...

U-line sells them (or 16 gal versions) but they are brand new prices.

https://www.uline.com/Product/Detail/S-19411/Drums/Steel-Drum-with-Lid-16-Gallon-Open-Top-Unlined

I've seen a test of a fairly large sawdust cremora back in 2018 in a large thin-walled steel tub - not quite the same as the 15-16 gal drum, the cremora went up - mostly. The tub was turned inside...