There shouldn' t be a difference in pressures of the 356 or 358. As far as pointed bullets go you can load one in the magazine and one in the chamber if you want to use pointed bullets, but there are several flat-nosed type 35 caliber bullets available to the handloader. The 356 Win and 307 Win are both pretty much obselete so finding ammo and brass would get harder as time passes. I don' t know if Marlin ever chambered either the 307 or 356. They chambered a few 375 Win rifles. I would like to have one of those. Had a Winchester 94 in 375 Win. Loved the cartridge but I don' t care for 94s.