There are several advantage in using cheap cast bullets. One being by casting your own and reloading you can save a bunch of money while practicing handling and shooting the rifle you want to hunt with, Not always necessary but useful in that you are more familiar with the firearm you plan to use. Another reason is, it really gives you two rifles in one, Load it up with jacketed premium bullets at near max loads and you shoot flatter at greater ranges like maybe a bean field. Stuff some hard cast flat nose bullets in there and slow'em down and you have a great short range tree stand/heavy cover round where you don't need speed or BC.
These are some of the reasons why I .358 caliber in the first place, Very versatile caliber the .38 special to .357Max is a good example of this, and one of the favorite rounds on this forum. Right now I am looking to get just a little more out of a .357 barrel by rechambering to .358 X 39 or 9MM X 39 if you will, I should be able to get right at .35 rem power levels with 180 and 200 grain bullets but what I really want is to be able to shoot 250 grain bullets at sub sonic velocities. The longest shot I took last year on a whitetail was around 60 yards. those 250s going about 950 or so will just knock the snot outta dem dare deers.
One other reason I'm gonna make this rifle would be that no one around here would have even heard of it and I don't think Quick has one either so that's good enuff reason right there. Kinda the same reason I' gonna make a 7mm TCU out of a perfectly good .223 bull barrel.