Re: anti cant device questions
I think the fundamental issue is with the shooter... I find that I can be off by as much as 3 degrees, which is significant. Others have naturally good inclinometers between their ears.
At 100 yards, it makes no difference. At 1,000 with a 308, cant makes a pretty big difference. I don't know that many people are off by 5 degrees, but if someone is likely to be off by that much, they should definitely use one.
I use the Level Grouse. It has two diodes, one red, one green. I can't tell you which color is which side, but it comes to me so naturally now that when I see one color, I naturally shift the rifle until no lights are on.
The disadvantage of the Level Grouse is it is battery operated. Have I had it go out at matches? All the time. I usually keep an extra pair of batteries in my stock pack. Even switching batteries is a pain and if I don't discover until I start shooting, I will finish the match without.
That is the biggest advantage of the bubble level. USO makes a good bubble level style ACD.
BTW, if you do buy a Level Grouse, I would consider buying it from Phoenix Tactical. Alamo Four Star has had a number of service issues. While I have ordered direct from them in the past with good luck, I know others here on the Hide have not had such great luck with them.