home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!haven.umd.edu!mimsy!usho21.hou281.chevron.com
- From: hhtra@usho21.hou281.chevron.com (T.M.Haddock)
- Newsgroups: rec.guns
- Subject: Recoil Formula
- Message-ID: <9211191800.AA22358@usho1d.chevron.com>
- Date: 19 Nov 92 21:07:10 GMT
- Sender: magnum@mimsy.umd.edu
- Organization: Chevron
- Lines: 68
- Approved: gun-control@cs.umd.edu
-
-
- I was flipping through my reloading manuals and books and I came across
- a short blurb about How to Figure Recoil. I remember that someone had
- asked about how much recoil certain calibers produced so I figured I'd
- post it for general interest.
-
- Source: Handbook for Shooters & Reloaders, Volume II, pg 102
- P.O. Ackley
- Plaza Publishing
- Reprinted without permission.
-
- -------------------------------------------------------------------------------
-
- FIGURING RECOIL
-
- If one wishes to figure recoil, the following method of computing recoil
- was devised by Homer S. Powley.
-
- To calculate a very close estimate of total gun recoil energy when using
- DuPont's PB, SR, or IMR powders.
-
- Add the powder charge, in grains, to the weight of the bullet (or shot
- plus wads), also in grains, multiply the sum by the powder charge, in
- grains; this product is then divided by eighty (80) times the gun
- weight in pounds to get the answer in foot pounds.
-
- The answer agrees with a recoil pendulum because it allows for the Jet
- Effect of the escaping gases. The recoil is different for other types
- of powders where the Kinetic Energy of the powder is different.
-
- -------------------------------------------------------------------------------
-
- So, using the formula:
-
- Recoil = ((Powder Wgt + Bullet Wgt) x Powder Wgt) / (80 x Gun Wgt)
-
- with reloading data from my Hornady Reloading Manual, I get the following
- recoil numbers for these popular calibers:
-
- IMR
- Gun Bullet Powder Powder Recoil
- Caliber Wgt Wgt Wgt Type Energy
- ------- --- ------ ------ ------ ------
-
- .223 7 55 25.9 4895 3.74 ft/lbs
- .243 7 87 42.3 4831 9.77
- .25-06 8 117 49.7 4831 12.95
- .270 8 130 57.2 4831 16.73
- .280 8 139 57.0 4350 17.46
- 7mm 8 154 60.1 4831 20.11
- .308 8 150 44.9 4064 13.67
- .30-06 8 150 60.3 4831 19.81
- .300 9 150 68.0 4350 20.59
- .338 9 225 70.0 4831 28.68
- .416 9 400 83.3 4350 55.92
- .458 9 500 77.3 4320 61.98
-
-
- As always, your mileage may vary. I know that the .300 Win Mag I've
- shot sure seemed to kick alot harder than 1 ft/lb more than the 30-06!
-
- TRAVIS
-
- Disclaimer: Formulas and loads are taken from reliable sources but
- are used here for example purposes only and should not
- be used for actual reloading data.
-
-
-