Hear ya. In my mind there is no such thing as too much consumables as long as it keeps. Cache might be found but never lost unless cached by a fool. You never know who might need to be resupplied, hunkering down in a stick built house is also a short lived delusion. 600 rounds is doing good man, I know all to well what its like to pack weight through the mountains for miles on end, it gets heavy quick, even if it isn't steep just stepping over down logs all day is tougher than people think. For me 240 m855 rounds rifle and 54 pistol 9mm, move fast , hide will. Hit and run and if I live through that many rounds I will feel fortunate , find cache and refill, purify some water , check some traps and continue
Yes, it sure is. Being a target gives you the extra adrenalin.
The new load bearing vests and leg carriers are amazing today compared to the stuff of the 60's and that era. I loved the M-14, but the AMMO was heavy. That is one good thing about the 556. I am like you on the 45. only about 56 rds there. If you are down to using it you are in DS anyway.
If no one is on your azz you have all the time in the world, so load means little.