I picked up a winchester 71 last year and ended up getting some hornady ftx bullets off of gun broker. I haven't had a chance to load any up yet, but while I was looking at Hammer bullets i saw that they make a .348 157gr bullet. Here is the link.

https://hammerbullets.com/product/348-cal-162g-shock-hammer/

I haven't used any hammer bullets before but they seem to be fairly popular. Just thought I was pass the link along incase someone is in need of bullets.