Since my last post I've tested a number of 9-mm Luger loads using Bear Creek 124-gr RNL moly and Ranier 115-gr RN copper-plated bullets, using a CZ-75B and a Taurus PT-99 with stainless steel barrel, both full-sized guns. Before firing, I stripped, thoroughly cleaned and lubed both guns.
Starting with light loads of 3.4-gr #231 with both bullets, the CZ functioned perfectly, with the slide remaining open at the end of the clipload. Accuracy was best in loads of 3.6 to 3.8-gr, with a slight edge to the Ranier...which might have just been me! No leading from the Bear Creek at any power up to 4.0-gr, which was as high as I tested. Could cover the 25-yd groups with one or two pasters (the targets got rather frayed after several groups).
The Taurus results were considerably different! Lots of leading with the Bear Creek at all powers...I think that is because of the stainless steel barrel, as I've had similar results with lead bullets in other SS pistols. Frequent FTE problems below 3.6-gr, where FTE and FTF problems were about equal. At 3.7-gr, good functioning except the slide wouldn't stay open at the end of the clipload. Finally got the slide to stay open at 3.8-gr. Accuracy was best at 3.6 to 3.8-gr, about on a par with the CZ. No leading in either gun from the Ranier.
Conclusions: (1.) Think I'll sell the Taurus. (2.) Both the Ranier and Bear Creek are fine for range work. (3.) I'll standardize on 3.8-gr of #231 for 115 to 125-gr 9-mm Luger. (It's interesting that this loading worked so well for function and accuracy in both bullet weights! Certainly not expected.)