Hello shinjin:
I too have had problems getting short ctgs. to feed up on mauser actions. If you have the Gunsmith Kinks books by B Brownell, he has some suggestions. I use a spacer to shorten the mag box, from the rear. It seems to me that the short, small calibers are more difficult than the ones that are 30 cal.+.
The last one that I built was a .260 rem for my grandson, it fed pretty good with the long 140 gr. RN hornadys. Also the box mag can be shortened and welded up, some shorten the follower also.
I have a friend that has a old Herter built 22-250 that is a tack driver, it has a bull bbl. and a 12 pwr. scope, so don't give it up too soon because they have potential.
I hope this helps, I enjoy your posts, keep um coming.
Gibson Guitar Lover,
HM