7.62x39 Questions

[Leatherneck556]

So I understand that Wolf Military Classic JHP will fragment at closer ranges. Does this diminish the 7.62x39's primary terminal strength: intermediate barrier penetration? Or does the round still effectively penetrate barriers/loaded mags/etc and attain necessary penetration in tissue/ballistic gel to be terminally effective?

Also, what are some of the brand names of the cheaper lead-core FMJ rounds that yaw and tumble early like 5.45x39 rounds? I've heard that Golden Tiger is one of them; is this true?

Lastly, what is a good source for some of the other "premium" 7.62x39 loads. I can't find a place to buy the Lapua 125gr round anywhere. What about the Winchester load and DPX?

Thanks