War Eagle,

I have both and I can't see a hoot's worth of difference in performance between the two. In fact, I often find myself using load data for the 6.5x55 in the '57. Load data for the 6.5x57 is fairly scarce. At one time I dreamed of writing an article comparing the commercial 6.5's. Which is why I purchased the 6.5x57. I also own rifles in 6.5x54 MS and 6.5x64 Brenneke (aka: 6.5x.270 Win.)

For ease of reloading, inherent accuracy, proven performance, and brass availability, one just cannot beat the 6.5x55! IOW: Logic favors the Swede...

However, if one travels to the beat of a different drum.... Then anything goes... ! grin I rest my case...

Grasshopper

"As you walk thru life, don't be surprised that there are fewer people that you encounter seeking truth than those seeking confirmation of what they already believe!"