Hey mate,
Its not that they are hard to get, just that rifle bullets (particularly 243) are rather expensive projectiles, normally around 60 dollars for 100.
Since I work 12 hour days when I get home casting seems like a fun and economical pass time. I would be lying if I didn't love the scientific process of testing and maybe coming up with a good alloy. 223 projectiles are dirt cheap and not worth the hassle. I plan to shoot a lot of pistol and 308 so I will want to find an economical alloy for that too. One issue is there is in some places over 1000 roos per acre, which makes centerfire hunting prohibitively expensive on mass culls. The 17hmr or even 22lr has been knocking down roos with well placed shots for a century, however for 17hmr at $17 dollars per 50 even that adds up. If I can cast cheap enough I can be hunting without getting the wife mad.
I got on the lathe and turned up a fitting i can weld into a lee press to turn 22lr rounds into brass jackets and make my own die for hollow point 243 rounds, but I want to see how powdercoating plain cast bullets goes first, I saw an excellent video of a guy on youtube taking the brass jackets and simply filling them with cast lead in a mold designed to achieve the right point. Fantastic idea i'm reserving for now.
Right now I want to see if I can hit 3000fps with an accurate bullet, and i'm hoping with the right WW + babbit alloy and a powdercoat we can get there.