Gentlemen, thanks for your input and recommendations. Based on reading Sharpe's
Complete Guide to Reloading and
Propellant Profiles I decided to range test 13.0 & 13.5gr of SR4759, lot Oct 21, 1993 ... found on a dusty shelf at our local reloading supplier who sells out of a chicken coop
* Sharpe's updated 3rd Edition of the 1937 First Edition lists one powder for the 180gr 8.15x46R - 13gr SR4759
* Propellant Powder, Fifth Edition, has a nice write up on SR4759 ... single base, porous surface - greatly improves ignition in low pressure loadings. Per John Wooters, article author, -
Quote: "in my opinion, the single best propellant ever marketed for cast bullets in rifles, etc ... the result is very uniform ballistics from shot to shot, even at low velocities."
In the loading data table: 32-40WCF - 13.5gr with the 175gr Lyman 319295. The article lists load data for 23 calibers from the 218 Bee to 45-90!
The other load for the 316180 BACO (178.5gr actual) stop ring bullet is going to 'shirt tail' on J Lewis's excellent 300-MP loading results. The test charge will be 12.0 and 12.5grs. Wish me luck!