If these are the high spot measurements then the bore looks okay, but remember the slug will show the tightest section of the bore. dark bores can have an effect on the accuracy of the rifle, but I've yet to see one that is 6-9" @ 25. With the bore size eliminated that leaves the crown and headspace. On these older Yugo's it nor uncommon to find crowns that were worn from the use of the steel cleaning rods they were issued with or owners that didn't know the proper method of cleaning. So as Aragorn243 said, you can counterbore the barrel or have it recrowned. You might want to have the headspace checked by a smith or if you want to invest in tooling get the GO/NOGO gauges and do it yourself.
M24's are really nice Mausers in my book and its got a strong action, I would be a shame to make it a wall hanger. You could also consider selling it and getting a rifle you like with the money.