Found this on Google..................
Use at your own risk!!
The 5.6x52R can be reloaded, and the Hornady Handbook, Third Edition has data for reloaders. Data for European shooters is available in European reloading manuals. IMR 3031 is recommended as a good powder for the .22 High-Power. Hornady makes a 70 grain Spire-Point .227" bullet (BC .288, SD .194) specifically for the 5.6x52R, which they describe as a "varmint and small game round." Hornady's test rifle for developing the following loads was bolt action Mauser 66 and they advise that for old lever action rifles their maximum loads should be reduced by at least 10%.
Hornady data shows that their 70 grain Spire Point can be driven to a MV of 3100 fps with 28.3 grains of N203 powder, 27.4 grains of IMR 3031 powder, or 27.6 grains of N201 powder. The trajectory of that load looks like this: +1.6" at 100 yards, 0 at 200 yards, and -7.5" at 300 yards. These loads used RWS cases and Federal 210 primers.