Quick thoughts;
The main problem is we’re likely to have is an endless winter (assuming a nuclear armageddon).
This means crops and animals that rely on crops will be unavailable after the first 6 months, and you have to survive probably 2 years before the air clears enough.
So the answer is to have a 22 singleshot rifle and a shotgun. The 22 is for small game and the shotgun is to encourage any preppers you come across to have community spirit and give all their goodies to you.
Rather than hunt game you can rely on a steady stream of soft southerners coming up to the Highlands – just eat the Tories and help the rest, although that may be too rich a diet.
Basic tools like a catapult are useful at short ranges and don’t require the time investment of building an archery arsenal. Ammunition is lying on the ground.
Other tools an axe, machete, wearable knife, a good spade and pick , and you’re set for building your own shelter out of the urban areas.
Transport. Singlespeed bike – probably a Surly Big Dummy fully set up would be ideal.
Alternatively become a Mormon now.