G D is a little more bulky than Unique, however it is a faster powder so less is used. Bottom line - the amount of powder I use of both GDot and Unique with the 250 gr RNFP fills the case to approximately the same level (1/3 of the way to base of bullet). I have not had good results with 38 spl, only large capacity cases with heavy cast bullets (220 gr in 41 mag).What sort of bulk does Green Dot ( or the present incarnation of it ) have?For example, in Standard Pressure, Standard Loading .45 Colt, is it just a little dab in the bottom of the Cartridge? Or, does it come up half way? Or..?Is it any Good for .38 Special? ( I notice so far, the only 'low pressure' Cartridge mentioned, is .45 Colt ).