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Double Rifles, Single Shots & Combinations >> Double Rifles

Marrakai
.416 member

Reged: 09/01/03
Posts: 3491
Loc: Darwin, Top End of Australia

Re: Target for zeroing with open sights
09/12/07 01:45 PM

IMHO a lot of nonsense has been written about this 'wandering POI' supposedly caused by a round bead fore-sight, and I believe the furphy was probably started by paper-punchers rather than hunters. The Brits made virtually all their double rifles with a gold or platinum bead during the 'hey-day', and for very good reason. Because it is round, it will almost always catch light from some angle, except directly in front where the silhouette profile is relied upon.

Look, do the math. A typical large gold or platinum front bead is around 80 thou in diameter (many are smaller). If the side-light is reflecting off one half of the bead, leaving the other half in shadow, the center of the bead may appear to be 20 thou to one side of its actual position. Given a 20-inch sight radius, which would be typical of a DR, the bullet will strike 1.8 inches to one side of the POI at 50 yds. Negligible! This is still only 3.6 inches off-line at 100 yds. Even the best shot in the world will not hold his group to significantly less than 3.6 inches at 100 yds with open express sights under field conditions. Any animal shot at with a large bead-sighted DR at 100 yds is going to have a 12 to 20 inch boiler-room, so what's the problem?

Most of my DRs have gold bead fore-sights, and I love 'em. Wouldn't alter them if you paid me!

(...with apologies to Gerald Burrard, who is the first author I can find to advocate the flat-face bead, although like JPK above, he specified that it be sloping forward to catch sky-light, and undercut to throw the stem into shadow.)

--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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Subject	Posted by	Posted on
Target for zeroing with open sights	93mouse	06/12/07 11:04 PM
Re: Target for zeroing with open sights	hoppdoc	07/12/07 12:29 AM
Re: Target for zeroing with open sights	Marrakai	07/12/07 03:29 PM
Re: Target for zeroing with open sights	DarylS	08/12/07 03:46 AM
Re: Target for zeroing with open sights	9.3x57	09/12/07 01:19 AM
Re: Target for zeroing with open sights	JPK	09/12/07 01:36 AM
Re: Target for zeroing with open sights	9.3x57	09/12/07 02:09 AM
Re: Target for zeroing with open sights	Bill_Cooley	09/12/07 01:57 PM
Re: Target for zeroing with open sights	JPK	10/12/07 02:03 PM
Re: Target for zeroing with open sights	9.3x57	09/12/07 02:22 PM
Re: Target for zeroing with open sights	Marrakai	09/12/07 04:50 PM
Re: Target for zeroing with open sights	9.3x57	10/12/07 01:19 AM
Re: Target for zeroing with open sights	peter	10/12/07 04:06 AM
Re: Target for zeroing with open sights	9.3x57	10/12/07 09:18 AM
Re: Target for zeroing with open sights	DarylS	10/12/07 09:47 AM
Re: Target for zeroing with open sights	Marrakai	09/12/07 01:45 PM
Re: Target for zeroing with open sights	400NitroExpress	10/12/07 11:11 AM
Re: Target for zeroing with open sights	DarylS	10/12/07 11:48 AM
Re: Target for zeroing with open sights	400NitroExpress	11/12/07 02:59 AM
Re: Target for zeroing with open sights	9.3x57	11/12/07 03:45 AM
Re: Target for zeroing with open sights	DarylS	11/12/07 11:40 AM
Re: Target for zeroing with open sights	Rustyzipper	11/12/07 10:03 AM
Re: Target for zeroing with open sights	9.3x57	10/12/07 12:26 PM
Re: Target for zeroing with open sights	JPK	10/12/07 01:38 PM
Re: Target for zeroing with open sights	9.3x57	10/12/07 02:00 PM
Re: Target for zeroing with open sights	Ripp	10/12/07 02:24 PM
Re: Target for zeroing with open sights	JPK	10/12/07 02:28 PM
Re: Target for zeroing with open sights	9.3x57	10/12/07 02:37 PM
Re: Target for zeroing with open sights	JPK	10/12/07 03:00 PM
Re: Target for zeroing with open sights	9.3x57	10/12/07 03:22 PM
Re: Target for zeroing with open sights	JPK	10/12/07 02:17 PM
Re: Target for zeroing with open sights	JPK	10/12/07 01:51 PM

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