gamestalker
member
I recently was given a bunch of 7mm rem. mag. nickel brass. As I was working up some loads with RL22 and putting them through the chronograph, I noticed that they were producing a little higher velocity. The same load specs. I recorded with standard yellow Remington and Winchester brass, were delivering an average of 2.1% higher velocity based on 20 rounds tested. Accuracy didn't seem to vary, however, primers were noticably flatter indicating pressures were probably a little higher.
An example of what I observed was with a 120 gr. Hornady PSP. Average MV velocity with the yellow brass with 67.4 grains of RL22 OAL @ 3.335" was 3318 fps. With the nickel brass and everything exactly the same, my average MV was 3388 fps. The only variation I couldn't avoid on this first test was FL sizing. I'm not sure what difference neck sizing will make, but I would venture to guess that MV may decrease slightly, we'll see.
An example of what I observed was with a 120 gr. Hornady PSP. Average MV velocity with the yellow brass with 67.4 grains of RL22 OAL @ 3.335" was 3318 fps. With the nickel brass and everything exactly the same, my average MV was 3388 fps. The only variation I couldn't avoid on this first test was FL sizing. I'm not sure what difference neck sizing will make, but I would venture to guess that MV may decrease slightly, we'll see.