PDA

View Full Version : Frontal wind, veritical poi change



Pages : 1 2 [3]

thermaler
09-04-2014, 08:18 PM
...

There is a common misconception among shooters that a wind “blows” a bullet off its course as it travels downrange. It is very important to realize that a wind does not “blow” a spin-stabilized bullet off its course. Rather, because of its spin stabilization a bullet turns to follow the wind if the wind direction is perpendicular to the line of sight between the firing point and the target. This will be described in greater detail in Section 4. In the case of a headwind or tailwind, the moving air simply changes the drag on a bullet, because drag depends on the speed of the bullet relative to the air and not the ground. A headwind will increase the drag a small amount, in turn increasing the time of flight and causing the bullet to shoot low. A tailwind will decrease the drag a small amount, in turn decreasing the time of flight and causing the bullet to shoot high.This is pretty much what I've been saying--though maybe stated a little more succinctly. : )--Oh I do draw exception to the notion that a bullet "turns"-- I think "drifts" is a better description. Turn in an aeronautical sense involves yaw and/or roll

But today I couldn't even shoot straight at 100 yds--it was gusty from every direction! LOL (crappy scope actually : ) )

rjtfroggy
09-05-2014, 06:29 AM
But today I couldn't even shoot straight at 100 yds--it was gusty from every direction! LOL (crappy scope actually : ) )[/QUOTE]

" It is a piss poor mechanic that blames his tools".

FW Conch
09-05-2014, 08:45 AM
You guys haven't considered "spin drift" & "earths rotation" into the equation yet?

Just Sayin.........:-))

thermaler
09-05-2014, 09:01 AM
But today I couldn't even shoot straight at 100 yds--it was gusty from every direction! LOL (crappy scope actually : ) )

" It is a piss poor mechanic that blames his tools".True (and I am not an especially good mechanic--or shooter, for that matter)--but in this case--the eye objective on my Bushnell package scope is so loose it rattles around--there was no way to keep it from shaking around and the lock ring only torqued it to the side. Ya get what ya pays for.

foxx
09-05-2014, 09:12 AM
You guys haven't considered "spin drift" & "earths rotation" into the equation yet?

Just Sayin.........:-))

I was thinking about that yesterday, but was afraid to bring it up, Conch. :)

I like the rotation of the earth deal. Imagine that... your target is so far away that by the time the bullet arrives, the target has actually moved to the right due to the rotation of the earth!
Or did it move down?
East?
Left ?
Ah, Crap! :)

foxx
09-05-2014, 09:19 AM
True (and I am not an especially good mechanic--or shooter, for that matter)--but in this case--the eye objective on my Bushnell package scope is so loose it rattles around--there was no way to keep it from shaking around and the lock ring only torqued it to the side. Ya get what ya pays for.

Okay, Therm, but WHY was it rattling? Was the wind blowing it? :)

Cat 64
09-05-2014, 09:24 AM
Okay, Therm, but WHY was it rattling? Was the wind blowing it? :)

...from what direction and what intensity....should we brake it down in three components and analyze it?....lol. Or perhaps the rotation of the earth came into play and span that darn objective...just having fun after some very deep thinking guys...

thermaler
09-05-2014, 09:40 AM
I just bought a Ruger American--my first non-Savage bolt gun--and simply grabbed the first scope I could find in my box of "package junko scopes" and unfortunately grabbed one of the worst. I gotta tell you that Ruger is very well designed for a budget plasti-stock job. I thought about doing a comparison thread on the Axis list but don't know if it would get "banished" to the "other" lists.

foxx
09-05-2014, 09:45 AM
I think it's almost amazing how much better low-cost rifles can shoot these day. It's kinda good, kinda bad. I wonder if high quality rifles will soon become a thing of the past. (like a fine Swiss pocket watch that can't keep better time than a $5 drug store digital)

rjtfroggy
09-05-2014, 09:46 AM
Therm I had a guy at the range last year with a bush. and after the second shot the cross hairs actually disappeared, gone nothing left in there. This was on a 30/06 package deal. He ended up with a BSA (not my favorite) and absolutely loves it.Cost around $150.
Me I like the fixed power SWFA'S and the Mueller variables decent scopes for the money. I have a 6-25 Mueller that I like more than my Weaver T36, to my eye it is just as clear for half the price.

Cat 64
09-05-2014, 10:12 AM
I think it's almost amazing how much better low-cost rifles can shoot these day. It's kinda good, kinda bad. I wonder if high quality rifles will soon become a thing of the past. (like a fine Swiss pocket watch that can't keep better time than a $5 drug store digital)

Look at the cars...the KIA's and Hyundai’s of the world are so versatile and well made this days. Once upon a time only “well known manufacturers” were producing good/long lasting vehicles…not any more. Same with the rifles…

thermaler
09-05-2014, 11:46 AM
Therm I had a guy at the range last year with a bush. and after the second shot the cross hairs actually disappeared, gone nothing left in there. This was on a 30/06 package deal. He ended up with a BSA (not my favorite) and absolutely loves it.Cost around $150.
Me I like the fixed power SWFA'S and the Mueller variables decent scopes for the money. I have a 6-25 Mueller that I like more than my Weaver T36, to my eye it is just as clear for half the price.Preaching to the choir my friend--I have several fixed mag SWFAs--my favorite scope at almost any price. : )

thermaler
09-05-2014, 12:07 PM
OK--untill the thread police bust me--here is a quick list of my impressions about the American:

1. It has an honest-to-God stiff plastic stock--so far I don't see any need to reinforce or bed it.
2. It features a very nifty steel v "power bedding" which performs the function of pillar bedding and eliminates the need for a lug at the same time. Mating of top receiver to stock is very positive and achieves the same position without "bolt tightening voodoo."
3. The bolt has a small-angle throw for cocking--meaning the handle will easily clear the lowest-lieing scope objective.
4. Cold-hammer forged barrel secured with barrel nut-- like a Savage.

Things that I don't like so much, but minor quips:

1. Many reviews compare the trigger to being as good or better than an accutrigger. My opinion--not even close to an accutrigger; both functionally and adjustable-wise--though is "passable" for a marginally adjustable triggerpull. The trigger has no travel at all--it's simply a wall you push and then it breaks. This might change a bit as the trigger wears in.

2. I like to hand-feed my cartridges directly into the chamber--there appears to be a ledge or lip prior to the chamber that hangs the bullet making a hand-feed a bit of a chore--unlike a savage which generally slides right on in.

3. Magazine tends to rattle a bit--I have worries of one of them loaded deciding to part company with the rifle while out bashing around in the woods.

4. I can't say for sure--but the rifle feels a bit heavier than an axis; and doesn't have quite the same "handiness" or ability to come quickly to bear as I have with my axis rifles--but this may be just a question of getting used to.

eddiesindian
09-05-2014, 11:34 PM
Therm I had a guy at the range last year with a bush. and after the second shot the cross hairs actually disappeared, gone nothing left in there. This was on a 30/06 package deal. He ended up with a BSA (not my favorite) and absolutely loves it.Cost around $150.
Me I like the fixed power SWFA'S and the Mueller variables decent scopes for the money. I have a 6-25 Mueller that I like more than my Weaver T36, to my eye it is just as clear for half the price.

Ill step up to the plate on this one.
I own 3 BSA Tactical 6x24x44 and love them as well...Have never failed me. Lifetime warranty. Cant beat it. Im keeping pace with shooters who sport Leos/Swav/Nikons/NF and alike. I paid 149.99 each at that time. I believe there on sale at 129.99 now at Midway (exclusively)
I recently looked thru the glass on a Mueller and liked what i saw......
if I had deeper pockets?.....Id defently get a bad a$$ scope, but the fact of the matter is?....all the components I buy to feed all my children take a toll.

thermaler
09-06-2014, 06:58 AM
Ill step up to the plate on this one.
I own 3 BSA Tactical 6x24x44 and love them as well...Have never failed me. Lifetime warranty. Cant beat it. Im keeping pace with shooters who sport Leos/Swav/Nikons/NF and alike. I paid 149.99 each at that time. I believe there on sale at 129.99 now at Midway (exclusively)
I recently looked thru the glass on a Mueller and liked what i saw......
if I had deeper pockets?.....Id defently get a bad a$$ scope, but the fact of the matter is?....all the components I buy to feed all my children take a toll.I've never bought a scope that was made in China that I didn't regret spending the money on--though I have considered the BSA milrad model that comes with side focus and first-focal plane at around $250. Been burned once too many times.

eddiesindian
09-07-2014, 02:08 PM
I've never bought a scope that was made in China that I didn't regret spending the money on--though I have considered the BSA milrad model that comes with side focus and first-focal plane at around $250. Been burned once too many times.

roger that...been burned as well.
The main reason I went with BSA,s Tactical model was because of the positive write ups on Midways site.
I was pleasently suprised how well the BSA Tactical has done for me.
Curious as to how the glass looks thru the Milrad model....