SHTF = "NO RULES DAYS" (NRD) in my book. Living in the hurricane box, its not unusual to lose power for 3-14 days. I've never seen "no rules days" here.
But if NRD do descend upon you, put the notion in the back of your mind that when rules are once again restored/imposed, you will be held accountable for your actions. So remain the sheepdog and do not transition into a wolf.
Pretty lengthy list of blasters in most posts...
As my Gunny used to say, "you pack it, you hump it". Every round, every ounce, adds up when you're on your feet carrying a load.
So, if SHTF consider your loadout very carefully.
IMO, there are 3 different basic scenarios to consider and my weapons/loadout are different for each one.
1. Hunkered down
2. Mobile-on foot
3. Mobile-by vehicle
Each has it's own load-out parameters/plan.
SHTF, you need a good plan IN PLACE that should include like-minded neighbors; going at it alone is not a good plan. Of course a plan is just a plan, once *hit starts rolling down hill, most plans fly out the window and in need of adjustment (Murphy always gets a say in your plan). As is often said, "most folks don't plan to fail, they just fail to plan".
In my book, you need just 2 blasters, a handgun and a rifle. Both of which you are very proficient and have plenty of ammo.
And don't forget that stout edged weapon!