I've made one Mauser conversion to .300 H&H using the Zastava action for .375 H&H. This took a lot of finishing to feed properly but the end result was good. Anyway, I prefer the old Sako in many ways and build my next one on one of these. I took Sako AV in .375 H&H and rebarreled it to .300 H&H and it was ready to rock after that. Still my favorite rifle and the one I use the most.

For a project, I'd choose any old Sako. If you look at the left side of the receiver, you´ll see the model marking of the receiver. I prefer L61R and AIII in my projects but AV is also nice. Anyway L61R and AIII have better parts, in my opinion. Still, I'd have any of these in a magnum chambering, so I wouldn't have to work with the bolt face and the magazine box/feed lips. If you have any of these rifles in any magnum caliber and you decide to rebarrel it to .300 H&H, you'll get an easy job. More than likely the end result will feed the sleek .300 better than it did the original cartridge.