Again, accurate loads and higher velocities are not difficult to achieve. I believe the newer Norma 204 is somewhat faster and the current equivalent in burning rate is RL-19 or the discontinued Winchester WXR (I bought 10# on closeout for $10/pound so I use it a lot).
With a healthy load of my older N204, 150 grainers clock 2800 to 2850 fps. With a healthy load of H414, my deep throated 22" Winchester Model 70 Lightweight 7x57 shoots 140 grainers at 2900 to 2960 fps and is very accurate. Loaded to pressures which are standard today, the 7x57 treads right on the heels of the.
In a new, very strong rifle with modern steel such as yours, I see no reason to limit your loads to the anemic pressures and velocities of 120 years ago. I only shot Speer 145gr match bullets in this rifle so far.ĥ shot 0.25" group. Load that shot well in the Interarms Mark X Group would have been around 0.50" 2 shots were touching but I yanked the third to the right which opened it up to 1.3" GRRR Here are some of the loads that shot well in the CZ (wasn't able to chrono loads as it was raining): I haven't had much of an opportunity to shoot the 7x57's (I have too many toys and want to play with them all). I have four 7x57's (CZ 550FS, Win Model 70 Featherweight, Ruger MKII, and Interarms Mark X).
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