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Where does Rifle cant begin to matter?
- Thread starter jevyod
- Start date
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Is a scope level absolutely necessary? Not necessarily, but I put one on every rifle for reference. Do I use it at the range off a bench, not really. Do I use it in the mountainous terrain I hunt while setting up on side hills, shooting over sage brush, etc, etc.... Every Single Time!
basinman
Well-Known Member
Tagging in to see all the comments.
Dave Gustin, a former NRA record holder and Palma team member always shot his rifle canted. But anytime you asked him about it his response was always, "I shoot this way because I learned to shoot this way. But DO NOT CANT YOUR RIFLE." It throws off all your windage adjustments.
He had probably close to a million rounds or more under his belt, and used to burn out barrels in a single day. yes, that's THOUSANDS of rounds in a single day. (Back when the US Government was paying him to shoot and changing his barrels.)
He had probably close to a million rounds or more under his belt, and used to burn out barrels in a single day. yes, that's THOUSANDS of rounds in a single day. (Back when the US Government was paying him to shoot and changing his barrels.)
Joefrazell
Well-Known Member
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- Apr 29, 2017
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In hunting terrain it's very important as it's so easy to get your can't way off. I've had a hit be about 20" back at 630 due to cant.
Nice! So unless you know exactly how much cant you hold, you could be off by 5" vertical at 300 yards,
Don't cant!
That should absolutely not be the takeaway. Vertical is effected far less compared to horizontal, and you aren't going to be off by 5" vertically at 300 yards because of cant. The examples are always a 308 shooting 1,000+ yards and 5 or 10 or more degrees of cant. That is not reality. If you don't know you have 10 degrees of cant, you might want to see a neurologist.
Some food for thought: we all have levels built into our bodies, and you should be able to tell plumb to within about a 1-degree. If you cannot tell the difference, you should work on it. Also, the bubble levels are not always correct, rails are not always horizontal, tube mounted bubbles can get loose and move, etc. Something like a Sendit level would be better, but most guys aren't using those.
JustMe2
Well-Known Member
Here's a calculator for cant. http://www.mil-rad.com/scope_cant_calculator
I dont use an angle finder on my rifles.
When they are straight, the cant error doesnt exist. Why introduce another variable that you don't need to ?
and the 5" error is from the 300 yd chart in your attachment.
But hey, if you want to guess the cant angle, then guess the correction factor, be my guest. I'd rather just pull trigger.
When they are straight, the cant error doesnt exist. Why introduce another variable that you don't need to ?
and the 5" error is from the 300 yd chart in your attachment.
But hey, if you want to guess the cant angle, then guess the correction factor, be my guest. I'd rather just pull trigger.
charlesasmith
Active Member
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- Feb 6, 2009
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- 43
Euler: Thanks for posting the picture demonstrating differences in bubble level position of the same manufacturer's anti-cant device. I just recently discovered this issue earlier this year. Your picture clearly verifies this problem. Now I have to figure out what to do about it -Is it the base or the anti-cant device (or both)!
It is linear.
The chart shows -0.43-inches of vertical error at 300-yards with a 10-degree cant using a 308 (168 SMK with MV of 2700 fps, 2-inch sight height, & zero'd at 100 yards). The horizontal error is 4.95-inches.
Again, you'd have to have something serious going on to be 10-degrees off, see below for reference
@trhall , the error is non-linear. The error is dependent on time-of-flight.
