Scholarly works are lacking, but 8 - 32mm and half dollar sized (30+mm), are the sizes considered optimal. There was a paper that provided the 8-32mm number out here, but the link seems to have gone dead.
I don't think the BG will have a problem pushing these around.
The key to spawning success seems to be to provide shelter between the stones for eggs and yolk-attached fry.
4 acre pond 32 ft deep within East Texas (Livingston) timber ranch. Filled (to the top of an almost finished dam) by Hurricane Harvey 9/17. Stocked with FHM, CNBG, RES 10/17. Added 35lbs RSC 3/18. 400 N LMB fingerlings 6/18
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