I have reloaded for Winchester, Marlins and Savage models since the '70s.
Many old rifles have excessive headspace causing primers to back out to various degrees. Even full length sized rounds will sometimes give a tiny resistance to final bolt closing, especially with brass fired in other rifles. A different die brand may help you or not, there is lots of flexing/movement in levers. Savage 99 actions are not as "springy" as the others so seem not to present these issue "as much", but still might. I believe that newer Win 25/35 was loaded with 28gr of 748 with 117gr flatpoint bullet. I duplicated this load and got exact velocities etc in my 1937 94 carbine, it was very accurate. 3031 powder is an excellent substitute. Use a heavy crimp to keep bullets from setting back while in the magazine. The levers have very limited extraction power compared to a bolt action so a person can easily stick a case in the chamber with an errant load. I have always loaded slightly below max for my levers, and the more worn they are the lower my charge will be. Enjoy!
