Hi Twraska,i was shooting for sure over 15-20com Brow bar. Everyone was ok. there were also different lengths of pipes. The most common cals were 3006, 9.3x62 and 300wm. As far as I remember, the most accurate of them is the 3006. I remembered that, it was always the most accurate. Maybe he once packed certain grains in 1moa. Since the carbines that I was shooting were not mine, but at the customer's shooting range, I could not test the accuracy with different grains. I know they are very reliable and you can expect them not to jam bullets. That happened to me too, but very rarely. If you allow me to recommend a caliber, I think the 3006 and 9.3 are better choices. Mag 300 is not a good choice. With these two mentioned calibers and with a thermal sight, you will have an excellent night carbine, and when you remove the optics, you can hunt nicely in the forest during the day. I also believe that you know that it is not a weapon for long distances, so I would choose a shorter barrel, so that I would have a more dexterous rifle. I did not notice differences in accuracy in series (older-newer).