In your experience if it shoots good at

[Catfish]

I have had the problem you mentioned with .30-06 ammo years ago. I was haveing the problem with very lite bullets, 90 to 125 gn. I could shoot very good groups at 50 and 75 yrds but at 100 they were up to 3in. and at 150 you could not keep them on an 8 1/2 x 11 in. sheet of paper. I fired this ammo is several different gun and it was the same in all of them. I figured it was because I was over spinning the bullet, but with a 165 gn. bullet that would not be the problem. There is no good reason that your gun should not hold good groups with this bullet unless the gun just doesn`t like them.