Manufacturing unit blanks are sometimes offered but difficult to find. I don’t see blank ammo detailed in any of the nationwide catalogs that record Dwell ammo. Now after which Aged Western Scrounger has a number of although not in each and every caliber. Navy Arms sells five in one blanks https://strapweaponshop.com/product/triple-r-munitions-223-5-56-nato-blanks-100-rounds/