A question about the relic. Are there any possible combinations of ammo type boosts that cannot drop? For example - for my build the most convenient would either be only shotgun ammo (which to my knowledge rewards a higher bonus when you have a stockpile boosting only one ammo type) or shotgun and grenade count, neither of which have I seen drop. I know a blood boosting only one ammo type can at least be obtained through gibbed, but I have never seen a blood boosting grenade count nor managed to create one with gibbed.
So. Is a grenade count blood even a thing? And is it possible to obtain those variants without the use of third-party programs?