If stuck with factory loads, you may be stuck! I would suggest trying 180gr. or 190gr. bullets in an attempt to get the regulation sorted out. The heavier bullets might make the barrels tend to diverge, rather than cross.

In that rifle, you should easily be able to make the 180's and 190's do the factory's 2,200fps. of the 170's- maybe a bit more.

Too - if you can get .375 Winchester brass, being stronger brass in the head and web area, making 30-30's from them will allow higher pressure than the .30-30 brass can take. Since the rifle was an '06, slightly higher pressures than the .30/30's 34,000CUP should be possible - if you are a knowledgeable handloader.

If not, please disregard this post.