Hello K. Nek,
you’re right, probably we did not discuss deeply during our last meeting.
T171-01 is basically similar in hardness to OTTCM (you’re currently using) and OTTGR (you have used it before). The main difference should be seen in terms of surface quality because brass T171-01 formula has been enriched with grain refiners to make the final metal structure more compact. No differences in terms of hardness as cast can be reported.
X-Brass01 instead is a special formulation offering highest hardness as cast, therefore it is almost used for this purpose.
Could you pls check if T171-01 brass gave you any better quality surface when compared to the brass OTTCM you normally use?
Thanks a lot and have a nice week-end
Roberto