Not All Weapons Are Created Equal
While playing Fallout 4, you will come across many weapons. Rifles, ray guns, revolvers, launchers, you name it and you will probably find it somewhere in the wasteland. One thing you should note, though, is that all guns behave differently.
Each weapon has its own nuances for you to grow accustomed to. If you find something that suits you well, stick to it, even if you find something stronger of a different type. For instance, if you like revolvers (strong, pretty accurate, usually slow) you may want to stick to things of that type, especially if you’ve built your play style around it. A shotgun may offer more power, but nowhere near the amount of range and accuracy.
On top of weapons handling differently, different ammo sizes offer varying amounts of power and some are more rare than others. One of the most common ammo types is 10mm, so always make sure to keep a gun capable of firing these on hand (they have decent power and are your most well-rounded option). Always keep stock of your ammo reserves, they have no weight so carry as much as you want, but take note of which ones you seem to find the least.