Try the Prvi Soft point ammo, if you're concerned that the FMJBTs won't group acceptably- But I'd try them as well before making a bulk buy. If you don't reload, then the S&B might be OK, but the last time I pulled any bullets from them, they were FMJBTs as well. No joy w/ the new Kynoch ammo?
The South African Milsurp ammo was FMJBT as well, but it shoots fine in most of my No.4s.
You're pretty much either gonna have to load your own or use a soft point ammo of some sort- which MAY decrease reliability ifn some cases.
ETA: Sorry, the Prvi SPs are boat tailed as well.