RimfireCentral.com Forums - View Single Post - Cheap but good airgun?
View Single Post
  #54  
Old 01-05-2010, 10:22 AM
aom22's Avatar
aom22
US Air Force Disabled American Veteran Law Enforcement Officer NRA Member - Click Here To Join!

Moderator
Join Date: 
Sep 2004
Location: 
Fort Stockton, TX
Posts: 
4,680
TPC Rating: 
0% (0)
The Energy Needed for a Humane Kill, Required Velocity and Related Accuracy

Quote:
Originally Posted by T191032 View Post
... According to Dr. Beeman's "Field Use of an Airgun", it is stated 3 ft-lbs
and the velocity would be about 415-420 w/ (I'm guessing a 8-grain pellet) in .177.
With the .20 it would be 345-350 fps and .22 300-325 fps....
Quote:
Originally Posted by j.r. guerra in s. texas View Post
... The old rule of thumb for hunters was .177 for feathers, .22 for fur...,
This may help make things more clear.

Quote:
Originally Posted by aom22 View Post
The following tables excerted from Field Use of an Airgun illustrate kill zone area size.
The energy needed for a humane kill, required velocity and related accuracy.


And, the velocity and energy of pellets at given ranges.
The Air Rifle Hunter's Guide, by Tom Holzel


Quote:
As an example consider squirrel shooting.
Examination of the accompanying tables show that, depending on caliber,
you must deliver about 3 FP to a roughly one-inch lethal area

The energy/velocity and accuracy tables show that even a .177" match air rifle
delivers sufficient velocity up to perhaps 50 yards,
but that a hit in the critical 1" area is extremely unlikely beyond that distance.

Thus, potential accuracy is ultimately the limiting factor, and your ability
to get that accuracy depends on practice and good equipment

Don't minimize the importance of good equipment; no matter how well or poorly you shoot,
better sights, a more accurate gun, a better trigger, and better pellets will tighten your groupings


Also, pellet trajectories for various common calibers.

Quote:
The really key point in airgun hunting is not muzzle energy,
but how well energy is carried out to the prey.
The energy/velocity table shows dramatically how heavier, larger pellets keep their energy.
The clear winner in energy retention and ballistic efficiency is .25" caliber.
Thus, trajectory drop with the bigger, heavier pellets is far less than might be expected.
__________________
W. Edwards Deming ... Quality: It is not enough to do-your-best;
you must know what-to-do, and ... then ... do-your-best.
Ever-Onward ... Through the Fog ---- Fort Stockton TX 79735
Reply With Quote