A friend has a nice Brno 7x57 for which he is beginning reloading - jacketed for now.
His load so far is Speer 160 gn HotCor with 39.5 gns Reloder 17. Speer lists 44 max with WInchester brass.
My friend's brass is nny (PPU). I suspect that the nny brass will be of lesser volume than Winchester, revealed in the first instance by case weight.
The basis of my suspicion on nny is the variation I find in .30-30 brass - less than 130 gns unprimed for Remington, about 140 gns for PPU & Starline, and in between for PMC, Winchester and Federal in that order. With my cast bullet loads I found a velocity difference of 50-100 fps between the extremes.
My request is simple - can someone with some Winchester 7x57 brass please weigh a few (unprimed) and post the numbers. I have asked my friend to send me the weight on the nny, so can compare in a future post.
Yes, I know - just use the chronograph, load to approach the velocity as per the data with all the same components (except brass), and case weight be damned. Unfortunately my friend is 500 miles away and does not have his own chronograph.
Sorry for the non CB topic, but too good an opportunity to tap into information.
Thanks Admiral - that establishes the relativity of Remington and Winchester cases.