Would probably be useful if Chems werent all of the following:
1) Weightless
2) Everywhere
3) Cheap
Turbo is certainly not plentiful and its REALLY short. Perk to double duration on bullet time? it makes the list of top 9 perks i've named are a must. Bare in mind you can have 15 perks @ 30.
Although you can craft turbo, the ingredients to mass produce it can be a real pain. And did i mention it lasts like 8-10 seconds or something ridiculously short? Chemist gotta love it.
I do use all my guns.
The ammo weight for 12.7 and .22 is listed as 0.00 which means its really light. So these two guns & ammo take up a bare minimum.
AMR ammo however is the heaviest ammo in the game.
Its not just ammo picking/buying/stealing stuff like scrap metal & all the crafting ingredients carrying consumables such as food,water, and lead for crafting ammo. Weapons such as grenades and mines etc all are effected by pack rat whether you plan on holding on to it or bringing it to your storage stash pack rat allows you to do it at double the time/efficiency/ half the hassle. Or better yet carry double amount of ammo, or mix and match.
Sometimes i sneak shoot w. Ranger Sequoia, sometimes i use sniper rifle instead of AMR, doesn't matter which gun the situation 90% of the time is it's overkill. So yes i can only carry one gun w. 1 ammo or i choose to use multiple guns.