I'm having a rifle rebarreled in a 6br with a 12 twist barrel.Can anyone help me with some load data? Thanks!

try 68gn flat base bullets with 29.5gns of H322 and a CCI Small Rifle primer behind it. worked real well for us at 200 yds

that's all the load data i could find, of course i do remember dad talking about going to 30 or 31gns (forgot what powder though) but this should be good enough to start you off.