Reloading Questions

I'm trying to find any input I can on good .358dia 200-250gr bullets to load for a Marlin 336er I recently inherited. This will primarily be a <100yd "brush gun" for me and I'd like to find out if anyone has experience with some tube mag safe bullets. I only have around 100 rds of factory Winchester ammo for it (60 250gr and 40 200gr). I'm trying to make a stock order for this cartridge for the foreseen future, as this cartridge has been obsolete for quite some time. I fear the longer I delay, the less likely I'll be able to find good bullets. I'm not fond of the idea of running hard cast projectiles.

Thanks.