I agree that these 5 types of guns are a great starting point for a fairly complete gun locker.

12 ga -- For me, I have 2, a Mossberg 500 with a bunch of barrels, and an old Browning auto-5 2 3/4" only. I love them both for certain stuff.

.22 Again, I have 2 favorites. And even though a 10/22 is on my short list to buy, I currently hunt squirrels and other little furries with a Marlin 25 bolt with an old Bushnell 3 x 9 x 32. Works very well. And my other baby is a 1926 produced Winchester model 06. A real beauty that was my father-in-law's gun as a kid. He gifted his Savage 99 to my when I had his 06 blued, and I re-worked the stock myself. It's a great little pump, and will shot 'em all, .22 short, long, or long rifle. after he died my mother-in-law told me to take the 06 as well .. since none of his own son's wanted anything to do with guns. Too bad for them.

I have many deer rifles but my current sweetheart is an old Swede Model 94 in 6.5 X 55 with a 17 " barrel and an older Weaver 2.75 OR 5X ... either or, not a variable. I leave it on 5X and it's mounted on the old weaver pivot mounts and rings. Very versatile and accurate enough for the short range swamp hunting I do.

Predator rifle would have to be my Model 98 German in .243. Though it's a short action round in a long action rifle it will feed well if you load the magazine properly. It is my best tack driver of all my rifles.

My slug gun is the Mossberg 500, but I have 3 different smoke-poles. A traditional cap and ball rifle which is a CVA Frontier with a 24" barrel. Actually shoots pretty good with 65-75 grains of loose black powder. I also have an old in-line "Country Boy" from Navy Arms (from china) which is very heavy but shoots just ok, and then a Traditions Lightning LR in .45 that shoot VERY well with 275 gr bullets in sabots pushed with 100-120 grains of pyrodex or other equivalent powders.

But you forgot to mention a side-arm for target and/or home defense!!!! ???