I recently purchased a Carl Gustaf stamped 1907 in 6.5x55. I am new to mausers but the gun was so beautiful I just couldn’t resist. It has been customized by the previous owner to have a mannlicher stock. I have read and heard that you have to be careful what factory ammunition to load into these old guns. So I guess my question is: what ammo is safe to load into this rifle? I have bought federal fusion 140gr and S&B 131gr. I really don’t want to have to reload this rifle but I will if I have to

Thanks for any help!