Calculating the Ballistic CoEfficient of your pellets

[villaman 9,983]

Hi

What Is the best range to calculate BC, if your zero was 30 yards what would you do it out to 40 50 60 yards ?

[zini 1,939]

Hi

What Is the best range to calculate BC, if your zero was 30 yards what would you do it out to 40 50 60 yards ?

 

The best range is the furtherest range that you can confidently shoot your rifle at mate.

[milegajo 595]

Ahh there you have it. My response would have been I don't know the best range but either 25-40 or zero plus 10/15 yards as these would map the drop of a .177 past the zenith of the pellets flight.

[zini 1,939]

This is due to gravity making your parabolic trajectory more curved as the pellet slows down in flight and gravity having more of a impact on the drop at greater distances over the horizontal plane.

[milegajo 595]

Hmm more tests required. My homebrews wouldve conked out before 60 yards.40 according to chairgun.

[zini 1,939]

A copy and paste from a good site i sometimes use.

 

There is a physical ballistic problem encountered when shooting on angles that causes the bullets point of impact to hit high. Shooting on angles is what every hunter experiences while hunting in mountainous terrain. Sheep hunters and deer hunters alike know all to well, that if their target is up or down on an angle, that they must aim low because the bullet will impact high. The reason for this has to do with gravity and the adjusted site height above the bore of the barrel.

 

When we zero in our rifle at 100 yards, we are shooting on a flat plane with the full force of gravity pushing down on the bullet. In order to zero properly and get the bullet to strike the bulls-eye, we need to adjust the sight height above the bore of the barrel for this particular condition, (shooting on a flat plane) so that when the bullet leaves the bore of the barrel it arcs up into the full force of gravity, and then drops down onto the bulls-eye.

 

However, when we shoot on an incline or decline (up or down on an angle) the force and effect of gravity is less on the bullet; but the sight height above the bore of the barrel remains the same, or adjusted for shooting on a flat plane.

 

Because of this, the bullet will have a flatter trajectory and strike the target higher than where our intended point of aim was. It is imperative that when we are shooting up or down on an angle that we eliminate the guesswork, and correct the straight line distance to the target or “sloped distance,” to the, corrected for gravity, distance to target.

 

http://www.longrangehunting.com/articles/angle-shooting.php

Edited August 15, 2012 by zini

[stealthy1 3,964]

I use WD40 too and i have never seen ignition mate.

 

Just be sparing with it.

 

This is almost 3 years old now.

 

Sorry for the poor quality editing but i was only learning editing then.

 

http://www.youtube.com/watch?v=jyTA3x1YV9A

 

Si.

 

 

So what was the gun pushing at 580.8

[pianoman 3,587]

Work through weighing the whole tin first and seperate the consistent from the odd mongrel that crops up. With H&N FTT it's always a case of a few either a bit loose or a few a bit too stiff in the breech. Use the odds for warming the rifle up and zero and hunt/shoot with the consistent ammo.

 

Simon

[zini 1,939]

I use WD40 too and i have never seen ignition mate.

 

Just be sparing with it.

 

This is almost 3 years old now.

 

Sorry for the poor quality editing but i was only learning editing then.

 

http://www.youtube.com/watch?v=jyTA3x1YV9A

 

Si.

 

 

So what was the gun pushing at 580.8

 

Ummm if you mean the FX 15.9 grain pellets (actual weight) with the highest MV of 582.3 it was 11.97 foot pounds so very close to the legal limit when lubed. A little too close for comfort if tested by the police though mate.

 

My HW97KT was doing over 14 foot pounds though until a few weeks ago without shooting lubed pellets.

 

It happens, but I'm glad its all sorted now.

 

Si.

Edited August 15, 2012 by zini

[milegajo 595]

Tah Simon. May need some marked resealable bags. With my junkie scales im gunna look like a proper addict/dealer.

[paulus 26]

feck all that just buy a 17hmr `to infinity and beyond` but the 22lr is better

[stealthy1 3,964]

I use WD40 too and i have never seen ignition mate.

 

Just be sparing with it.

 

This is almost 3 years old now.

 

Sorry for the poor quality editing but i was only learning editing then.

 

http://www.youtube.com/watch?v=jyTA3x1YV9A

 

Si.

 

 

So what was the gun pushing at 580.8

 

Ummm if you actually mean the FX 15.9 grain pellets (actual weight) with the highest MV of 582.3 it was 11.97 foot pounds so very close to the legal limit when lubed .

 

A little too close for comfort if tested by the police.

 

My HW97KT was doing over 14 foot pounds though until a few weeks ago without shooting lubed pellets.

 

It happens.

 

Si.

 

Now that is a fine line mate, thought it would be close

[zini 1,939]

Yeah tell me about it pal .

 

Not too wise having a rifle doing that power.

 

Si.

[MCMURPHY 4]

Might try a roll as describe with veg oil.