Hi, There's a good description of SU tactics in Sharp's "Soviet Order of Battle Series, Vol. 12 'Red Hammers'". Essentially he says that, unlike German StuGs, SU's were always used as self-propelled artillery and weren't designed for an assault role or as a tank substitute. Apparently, they were most often used in over-watch postions to provide flanking fire for tank and infantry outfits.
He also points out that none of them carried co-axial machine guns. I'd add that their traverse and depression were limited compared to German SP guns. This volume of his series, incidently, is dedicated to Soviet self-propelled artillery and lend-lease armor. I hope this helps. Best Regards, JP
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