Originally Posted by LouBoyd
I'm here to discuss and learn. Please post the correct math.
I thought you were suggesting a 133" correction for a 1 second TOF and a 10 degree cant.
I went back and re read you post and discovered I had miss read your table.
I wasn't trying to be a jerk...Sometimes it just happens.
FWIW several years ago I was one of the shooters over at Snipershide asking Brian Litz for a correction table/factor for rifle cant that actually matched our field data. During that time I spent months with an angle finder taped to my stock and though math isn't my thing I do understand the end values for a canted rifle. Brian solved the problem like it was nothing.
That said this is Long Range Hunting and though I draw no fixed line I try to stay inside 600 yards. Once I cross 600 yards I know things start to get complicated in a big hurry. At 1000 yards the variables (for me) are outside of my personal envelope of a sure kill. Out here your 10 degree cant value of 6 inches is noteworthy, however a 10mph wind has 10 times that value. Also four MPH wind error has 4 times the consequence of a 10 degree cant. To put it further into perspective a ten degree rifle cant has the same value at 1000 yards as does spin drift.....Clearly you understand all of this, and have already said as much, but if a guy is asking if he needs a level to hunt with....I don't believe he does.
Mikecr's Pennsylvania post got me thinking that I should also point out that I am not a prairie shooter and that I shoot in a heavily treed stands of Douglas Fir (tall straight and level and the crooked ones stand out). So I am surrounded by level points that (for me) are plenty accurate out beyond 1000 yards.
If going by what Mike says and I went deer hunting in Pennsylvania and I could actually cant my rifle 20 degrees...then at my self prescribed 600-700 yards I have a significant error of 8 inches or so.
In that environment I concede you may need a level.