fps

[Guest opossumeater]

whats the fps minimum to hunt rabbits

[mole catcher 1]

there isnt a legal requierment regarding power to humanely kill a rabbit but it has been said, that a pellet with a muzle energy of 4ft lbs at the target, not at the moment of leaving the barrel is enough to humanely kill a rabbit. What this is in fps i couldnt tell you.

[mole trapper 1,693]

Could be totally wrong here, certainly would not be the first time, but working on what MC has just said, if a .22 pellet is travelling at around 510 fps when it leaves the muzzle it is producing roughly 12 ft lbs energy, so if when it reaches its intended target it needs to have retained 4 ft lbs energy then it needs to be travelling at a minimum of 170 fps. .

Where are all the mathematicians when you need them.

[Born Hunter 17,782]

Could be totally wrong here, certainly would not be the first time, but working on what MC has just said, if a .22 pellet is travelling at around 510 fps when it leaves the muzzle it is producing roughly 12 ft lbs energy, so if when it reaches its intended target it needs to have retained 4 ft lbs energy then it needs to be travelling at a minimum of 170 fps. .

Where are all the mathematicians when you need them.

 

I cant really be arsed to start with equations and all that shit but im pretty sure its not a simple case of just dividing the volicity for 12 ft.lbs by 3 to get the velocity at 4 ft.lbs. Kinetic Energy = 1/2 x Mass x (Velocity squared), so the energy of the pellet is proportional to the square of the velocity. Therefore to find the velocity at 4 ft.lbs you square the volicity at 12 ft.lbs, divide by 3 and then take the square root, giving you the answer.

 

so for an air rifle in .22 (mass of pellet = 16gr), the average muzzle velocity will be approx 560 ft/s.

so velocity at 4 ft.lbs = 560 squared, divided by 3, then take the square rooot = 323 ft/s

 

if you want to do it the easy way, http://www.theoben.co.uk/customer/pages.php?pageid=5

[mole trapper 1,693]

yes thats exactly what i was trying to say born hunter, :whistle: .

[Born Hunter 17,782]

yes thats exactly what i was trying to say born hunter, :whistle: .

 

at least this bluddy physics degree course is good for somthing

 

Now then..................Special theory of relativity anyone?

Edited June 15, 2007 by Born Hunter

[mole trapper 1,693]

yes thats exactly what i was trying to say born hunter, :whistle: .

 

at least this bluddy physics degree course is good for somthing

 

Now then..................Special theory of relativity anyone?

 

Hmm you wouldnt perchance be the same brainy person that is putting some very interesting articles into an up and coming shooting glossy are you.

[Born Hunter 17,782]

yes thats exactly what i was trying to say born hunter, :whistle: .

 

at least this bluddy physics degree course is good for somthing

 

Now then..................Special theory of relativity anyone?

 

Hmm you wouldnt perchance be the same brainy person that is putting some very interesting articles into an up and coming shooting glossy are you.

 

very much doubt it, lol. im only 19 and just finished my first year of uni, today infact, so i wouldnt consider myself quite knowledgeable enough to have the honour of doing somthing like that quite yet.

 

maybe in the future though, ill just have to see where my life takes me, career wise.

[mole trapper 1,693]

was just a hunch, congrats anyway on completing the first year, all the best.

[Born Hunter 17,782]

was just a hunch, congrats anyway on completing the first year, all the best.

 

thanks

[Guest opossumeater]

i got a 1000fps pellet rifle .177 will that get the job done?

[mole catcher 1]

1000fps i would say that will do the job but you may find it adviserble to find a pellet that slows down very quickly on impact, something with a hollow head or even a flat head.

 

The reson behind this is you dont want all the kenetic energy passing clean through the target, you want it to stay inside the target causing shock trauma. The play off in using pellets of this shape is thay can become unstable in flight after about 30- 35yrds. But the good thing about having this much speed in your pellet is the trajectory will be so flat you should be able to get pin point accuracy at most distance within target range, thus allowing you to get a clean head shot each time.

 

just out of point of question, what make and model rifle are you using?

[Guest opossumeater]

I think its a Gamo 440 I believe i got it for plinking and shooting squirrels but i thought maybe if i shot a rabbit it would just run off and suffer somewhere. Wheres the shot placement with an air rifle same as a regular one, the lungs right?

[mole catcher 1]

some shooters favour a head shot, some favour a hart and lung shot. In my experiance both will stop a rabbit in its tracks but a solid head shot is what i favour

[Guest opossumeater]

is it possible/legal to make a silencer for a pellet rifle ?

Edited June 17, 2007 by opossumeater