here is some info about spin drift and Coriolis effect.
Far Out Shooting: Spin Drift and Coriolis Effect
does anyone have experience with these?
Far Out Shooting: Spin Drift and Coriolis Effect
does anyone have experience with these?
As a side note: if we inhabitants of the northern hemisphere were smart we'd shoot barrels with left hand twist rifling. This would pit spin drift and cori against each other and mostly cancel the two out!
Come to class!
http://www.longrangehunting.com/for...nge-shooting-class-nashville-tn-3-19-a-68987/
As a side note: if we inhabitants of the northern hemisphere were smart we'd shoot barrels with left hand twist rifling. This would pit spin drift and cori against each other and mostly cancel the two out!
no. shooting north and south east or west you always have a impact right component. however shooting east and west (and varying degrees )you also have a vertical component. shooting west you'll hit low, shooting east you'll hit high.Stupid questions:
(A) Wouldn't it depend on whether you are shooting north or south as to whether coriolis would take your bullet left or right?
(B) Why did the US military abondon their experimentation with left hand vs right hand twist?
no. shooting north and south east or west you always have a impact right component. however shooting east and west (and varying degrees )you also have a vertical component. shooting west you'll hit low, shooting east you'll hit high.Stupid questions:
(A) Wouldn't it depend on whether you are shooting north or south as to whether coriolis would take your bullet left or right?
(B) Why did the US military abondon their experimentation with left hand vs right hand twist?
Rem,
2.5" does matter @ 1000 yards. You make the same mistake/assumption everyone else does.
Let's say I'm making a 1000 yard shot at a white tail deer. I'm shooting at a 10, maybe 12 inch vital zone.
I guess the wind and break the shot.
Well, I pulled the shot to the right 1". That's a teeny pull if it only effects the 1000 yard shot an inch. But now my bullet is going to land tin the right quadrant of the 10 inch kills zone, matter of fact 1 inch right of center, but still 4 " from the right edge of the kill zone. So we're good.
I thought the crosswind was value x and would drift my bullet 8" and I compensated for 8". However the wind is actually y which is a bit more and will actually push my bullet an additional 4" that I had not anticipated.
So my 1" right pulled shot, plus my extra, unaccounted 4" of drift have now added together for 5" right error and my bullet is going to land in the very extreme right edge of the kill zone. So I got lucky, I'm still barely on the VERY edge of the kills zone.
OPPS! I forgot to add "those three little inches" of coriolis effect. Crap
1" pull error + 4" wind error, plus 3" coriolis =8" and now I've hit the animal well outside the vital zone.
I arrest my case. As I said, every "little" thing counts in long range shooting and the long range shooter needs all the help he can get as well as he needs to split every hair on the figuring & prepping end of the long range shot.
The same is said for long range competition shooting. A teeny little disregarded inch can make the difference of a 10 ring hit or a 9 ring hit and cost you the match.
Same for a tactical match shooting at steel targets. That little "insignificant 2.5 inches" can mean the difference between hitting the edge of the steel plate and winning or missing the edge by an inch and blowing the match.
The further the shot, the more heavily little things need to be scrutinized and factored in.
So was this supposed to say you add 3" right for Spin Drift and another 3" right for Coriolis? If so, I hate to tell you this but you cannot just put a number on Coriolis like you can Spin Drift because it is never gonna be constant...unless you are shooting at the same range (and I don't mean range as in distance, I mean range as in Firing Range/shooting spot).For my long range rifle Coriolis is worth 3" right at 1000 yds, a range I shoot at frequently.
Coriolis is worth "about" (too lazy to look up the exact figure right now) another 3" right.
Yes, it does depend on the direction you are shooting in conjuntion to true north/south. It will not always make your bullet drift right like spin drift from a right hand twist barrel. I believe the the poster below didn't quite catch onto your question.Stupid questions:
(A) Wouldn't it depend on whether you are shooting north or south as to whether coriolis would take your bullet left or right?
no. shooting north and south east or west you always have a impact right component. however shooting east and west (and varying degrees )you also have a vertical component. shooting west you'll hit low, shooting east you'll hit high.
at 45 degrees north lat the following will get you close
1/4 moa @1000 yrds
1/2 moa @1500 yrds
3/4 moa @1760 yrds
for varing degrees of east and west divide into full, 3/4, half, and 1/4 values. simular to the way you divide wind values.
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