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From: jkh@jade.BERKELEY.EDU (Jordan K. Hubbard)
Newsgroups: mod.rec.guns
Subject: firearms
Message-ID: <2162@jade.BERKELEY.EDU>
Date: Sun, 11-Jan-87 04:01:02 EST
Article-I.D.: jade.2162
Posted: Sun Jan 11 04:01:02 1987
Date-Received: Sun, 11-Jan-87 07:46:31 EST
Organization: U.C. Berkeley
Lines: 24
Approved: jkh@ucbjade
Author: ames!harvard!ll-xn!ames!uw-beaver!sigma!woody@cad.berkeley.edu (Woody Richards)

Article: 1:16


[ Hey, Woody, what's a .47-70?? Are you sure you don't have a .45-70?
  (and if so, what do you think of it)  - jh (da moderata) ]

>The author states that for a given revolver, the point
>of impact is the same for all bullets of the same weight
>regardless of velocity.  Heavier bullets strike higher and
>lighter bullets strike lower because of muzzle rise during
>recoil.  Higher velocity requires more force but this is
>cancelled out because it acts on the bullet in the barrel
>for a shorter duration.  Higher velocity does result in
>less drop due to gravity during the bullet's travel to the
>target, but this is insignificant at handgun ranges.

>Does anyone want to comment on this, based on either theoretical
>or empirical considerations?
This sounds possible, although I haven't tested the same conditions.
I have noticed that when I shoot bullets at different velocities out my
.47-70 I will get different points of impact.  400 grain cast bullet
at 1200FPS will strike 8-10" HIGHER than a 350 grain jacketed bullet
at 2200FPS.  This, I am told, is due to barrel time.  The instant the
powder charge is ignited the barrel starts recoiling back and the
muzzle up.  It would make sense that the longer the bullet stayed
in the barrel (due to lower velocity) the more time the barrel would
have to redirect the bullet's path.