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Strelok - stupid question


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Why does my 200 yard zero on my App show:-

100 yards -1.65 inch low

150 yards -1.15

200 yards 0.00

300 yards 7.48

400 yards 21.81

 

From 200 on - the figures are approximately the same as the Horndady 165gn SST figures - presumably from a 24 inch barrel.

 

I have 20ins (no smut please) and not Chrono'd the MV.

 

The minus's are confusing my little head.

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http://www.rifleshootermag.com/files/2010/09/rsballistics_0303a.jpg

 

Chuck Hawks shows it slightly different.....

 

http://www.chuckhawks.com/bullet_trajectory.htm

 

"Horizontal Shot. If the barrel is horizontal to the surface of the earth when fired, the bullet never rises above the barrel, and gravity causes an immediate descent."

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jcs is correct-the convention is that for drop no sign is given,but for a rise above a - is used ( a negative drop = rise).

 

Thus -1/ .2 means an inch high and .2 inches wind drift ; and 3.6/6.2 means 3.2 inches drop (Ie low) and 6.2 inches wind drift.These will be relative to a stated zero point (0/wind drift at that distance)

 

Tikka4Sika quotes Chuck Hawks,and is of course correct-but generally rifles have some (upward) tilt so start out on an upward trajectory ( negative dropas above) which peaks-velocity etc dependent-then begins to descend (called "Trajectory"-the familiar curve above the horizontal,until crosses and becomes 'drop' below that horizontal.

Gravity is acting all the time of flight,but s counteracted in the earlier part by velocity and upward barrel tilt.

 

There is no contradiction,and if the barrel were actually perfectly horizontal,bullet drop would begin at the mizzle (drop would never be negative-easy peasy) but simply become become larger with bullet time of flight,unti contact with ground (or a bump :-)

 

The diagrams will be different-specifically,the tilt of the barrel,unless very carelessly drawn.Scopes make the tilt far easier to judge,effectively changing 'line of sight' .......

 

or some such....perhaps someone will say it succinctly .....it's simple enough-because gravity is always a force down on the bullet,the barrel has to tilt up at first to zero (ie have the bullet descend across the horizontal-at some specified distance from the muzzle.

 

The essential trigonometric equation is blah blah blah.... even if shooting wolves in Argentina (coreolis is largely horizontal deflection in different directions N/S of equator) .......and not on a serious cosine slope hill,and.......not using a Blaser in 6.5 caliber which is an infinite range laser without trajectory...and......

 

....aaaarrrrrggggghhhhhhh ! !

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I bet you there are a whole heap of shooters out there that don,t really know what the scope actually does internally and makes you do without knowing it!!!!,,,,?

Doesn't matter though does it ?, how many genuinely know how a microprocessor works? , maybe .0001% of proficient computer users , the clever ones are the ones who have the idea and develop and build it , anyway , back to scopes heres how they work , found using a microprocessor ....

 

http://www.pyramydair.com/pages/techarticles/telescopicscopesmounts1.asp

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I bet you there are a whole heap of shooters out there that don,t really know what the scope actually does internally and makes you do without knowing it!!!!,,,,?

I agree. Sighting in a rifle with a telescopic sight and the concept of MPBR are very badly taught. Regards JCS

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I agree. Sighting in a rifle with a telescopic sight and the concept of MPBR are very badly taught. Regards JCS

So who does teach both ? those of us who been in the Armed services may have been taught otherwise most teach themselves with the help of mates and club members , there is also a huge amount thats on the net these days be it in text or youtub videos .edit some of it very useful and other stuff is crap.

 

I find Chuck Hawks puts shooting things in a clear and easy understand way http://www.chuckhawks.com/rifle_trajectory_table.htm

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So who does teach both ? those of us who been in the Armed services may have been taught otherwise most teach themselves with the help of mates and club members , there is also a huge amount thats on the net these days be it in text or youtub videos .edit some of it very useful and other stuff is crap.

 

I find Chuck Hawks puts shooting things in a clear and easy understand way http://www.chuckhawks.com/rifle_trajectory_table.htm

The training I have received to date has all been from ex-military or most recently someone who is still serving. Regards JCS

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The training I have received to date has all been from ex-military or most recently someone who is still serving. Regards JCS

There you go , not everyone can get that without coughing up a load of cash hence forums like this one can be a great help along with sifting the wheat from the chaff on other forums, of course not everyone wants to be able to shoot a gnats **ck off at 600yds and are happy with dropping a stag at 200 yds with a £400 rifle with a £100 scope.

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I bet you there are a whole heap of shooters out there that don,t really know what the scope actually does internally and makes you do without knowing it!!!!,,,,?

I kind of fit in there to a degree, if i'm honest...... :lol:

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