Long Range Hunting Forum

Yeah no problem. Of course you'll want to start light and work up.

81 grns Retumbo
3.55 Coal
250 CCI mag large rifle primers
ADG brass

Awesome thank you. I'm also curious if you have any rifling marks on the bullets? No matter how deep I seat my bullets it still has rifling marks on it. I bought 3 boxes of factory 160 grain nosler partition and they all have them as well. I have a 300 win mag mesa and didn't have any issues with it.

No I did not, but that is concerning. I used a modify case and a hornady oal gauge to measure my chamber/lands then backed off 5 thousandths

Yeah it is really weird and I'm going to call Christensen to talk to them about it. I used the same tools to get my lands measurement which was 2.704 CBTO without applying any pressure to the rod. I went .020 thou off lands and had marks. I seated a bullet as deep as 2.640 CBTO and still had rifling marks.

I have groups loaded at CBTO 2.775(COAL is around 3.490 if I remember right) 2.770, 2.665 and the bolt closes fine. This is where I felt like the marks started to not look as bad. I have a dummy round at 3.560 COAL from when I was measuring my mag (for feeding) and the bolt closes fine but still has marks on it. I've never dealt with this in any of my rifles so I'm a little lost.

are you getting the horizontal lines from rifling or are you possibly getting marking from other tooling? Don't mean to ask dumb questions it's just something I've never ran into