Question about loading for 3006

[Stadoc]

I just recently picked up a cz557 3006, it has a 20 in barrel and a 1:10 twist. I bought some factory ammo in 150,165,168,170,175gr. and had terrible results. I loaded some of the brass from the factory ammo with some speer 190g and 185 Berger hunters and my groups shrunk from like 2 inches to 0.80. Seems to like heavier loads. Question is should I try a heavier bullet and if so what do you suggest. Thanks in advance, I just don't have any experience with 3006.

 

[morgaj1]

What powders are you using?

 

[Stadoc]

H4350