I interchange Winchester and CCI with no issues at all. I prefer CCI's, but not for any reason relative to performance, it's a seating thing.
As for magnum primers v.s. standard primers, I identify the application through comparing data sources. Most reloading sources I've ever looked at will identify these aspects in the preface, or next to the load table of a given powder. Some books will use a symbol, bold print, or some other means of identifying which type of primer to use. And also check more than one published data source. And if I can only find one source that states a magnum or standard primer was used, then I use a that primer. This is primarily due to the fact that powders requiring a magnum primer will always state such, at least in my experience.
Those bullets without a canelure can't be loaded to more than just light target loads. I've learned that revolver cartridges will indeed produce bullet jump issues, with loads from mid level and up, which means a firm roll crimp is necessary to keep that bullet in the case mouth. So you'll be just fine as long as you don't load anything that is typical of a standard .357 mag. performance level. The best way to determine if you are encountering a problem with "jump" is to load the cylinder up, and then after each round you discharge, open the cylinder and check the remaining cartridges for any bullet jump, or increase in OAL. If you experience any change in OAL, then you'll need to either change to a different powder, or reduce your charge until the problem goes away. However, make sure you don't reduce the charge to below the published minimum with that powder, or squibs may begin to become a problem.
OAL in revolvers is pretty straight forward with canelured bullets, seat to the canelure and crimp. But for those without a canelure, I would try my best to get that information from the manufacturer. If you can't locate that data, then proceed by using the OAL of another bullet with similar profile characteristics.
GS