raze has a voiceline where she mentions she has 78 grenades left, if you use a grenade, get 2 kills, use grenade, get 2 kills etc can you use all 78 grenades?

I understand this is personal preference but im wondering if one would benefit me more then another.. I use 20cm/360 universal sens im stuck between using a cross or a dot on such a high sens which is better for flicking which is better fo...