Can anyone tell me more about this ammo.  
Does it have problems with split necks/brittle brass?
I recently came across an ammo can full.  

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Shot some of the same stuff last weekend...
- Some didn't fire at all and a fellow Mauser owner recommended to upgrade the firing pin spring to mitigate the issue
- Almost all of them hang-fired...  primer fires takes a 1/10 second and then the powder ignites
- Out of the 20 I shot I had 4 cases that have been very brittle and had cracks after firing  (they did eject like all others - no stuck bolt or anything like that)

I'm not shooting the rest of them for now and just keep them in the stash...
I have other Mauser ammo that works better / more reliable and I'll use this first.

If they were hangfiring I don't even know that the heavier spring would help that. Sounds more like the primers are gone, they are after all 81 years old. I would simply pull the bullets and dump the powder into a newly primed case, make for easy reloading since you already have a pre-measured powder charge.

Ive got a shit ton of this I havent shot but I have also heard the heavier or new spring helps as the primers are hard.

Pre-war yugo ammo I have sold to collectors in the past for $15-20/box.  I would sell it off or trade it for better stuff to shoot with.

Thanks for the replies.   I am going to try selling the ammo instead of shooting it.

Pre-war??
Headstamp says "40" = firmly puts it IN the WW2 era

Pre-war for the Kingdom of Yugoslavia.  Their war started and ended in April 1941.  The importance for people collecting Yugo/Serb militaria and other nationalities like Polish, is that it is pre-communist.  Polish collectors will buy anything Polish, but the preference and value is Pre-war > Nazi-marked > Communist