Is it worth the effort to maybe bore these rifles out to a new caliber then neck sizing with a forming die . Say bore these to 8mm and then have a new rifle all together.. 8x54r I would think these rifles are not worth the effort. Paying less than a hundred dollars for a rifle and then spending 2 or 3 hundred to have it bored out to a bigger caliber might be a waste of time but it would certainly improve the accuracy. I know that this practice was done quite a bit back in the days when the flint locks were still being used.. Shoot till it won't shoot then have it bored to a bigger caliber and keep on shooting. MIL