I’ve indeed been warming to keeping .375 in the mix, as I do plan another African stint for work and play. But I don’t varmint hunt, and there’s really no application in my purposes for .223 unfortunately as I prefer target shooting with .308.
Perhaps the 308Win and the 300WM are too similar to one another to bother with owning both...?
In the world of cartridges, the only thing similar between .308Win and .300 Win Mag is the bore size.
I’ve done just this over the last few years.
My entire gun safe is now
.22
12G
5.56
.308
45-70
That covers every single base in North America and then some.
At one time I had 11 different calibers. What’s the point? Why spread yourself thin, get good with what you have IMO! Spend the money on range time and practice with what you have rather than chasing a new caliber or loading all the time. Unless you have endless money, then own it all.
I follow the same line of thinking as you but with the addition of:
-an extra cartridge that is useful at longer ranges where the 308 falls short
-all the pistol chamberings
Now that I am retired, I'd like to do an extreme make-over, but I get the shakes just thinking about letting some of my favorites go. I do have them all ranked in order of priority, so when I get a new one in, I sell one from the bottom of the list... that will have to do for now. What I don't want to do is leave a mess of gear for my family to deal with when the final curtain drops.