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Front Sight Blade Basics (Read 999 times)
Oct 23rd, 2009 at 8:42am

Century2   Offline
KCA Forum Member
Krag Collector!

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I originally posted this back in May however it was lost in the forum restoration.  Cry Here's the abbreviated version:

For your viewing pleasure I have attached my drawing of the “perfect” Krag front sight. While this “perfect” sight may be beautiful on a museum specimen, it’s not a lot of good with modern ammo at the range. The front blade height of 0.410” was designed for the 220-grain USGI bullet at 2000fps. Unless you can handload perfect USGI loads or have “pet loads” that somehow get a similar trajectory, a sight adjustment will probably be necessary if you would like to hit a much smaller than man-size paper target. I inherited a case of factory Remington ammo - here’s what I found when you use standard hunting ammo in a 100-year old battle rifle and play marksman: With my 1901 sight in the down (lowest) position, it strikes the target about 3.5” high at 100-yards. To move the strike 1” at 100 yards, the Krag front sight needs to change height by .0068” (correlation solved graphically). I fabricated a front blade at .4340” [0.410” + (3.5 times 0.0068”)] and am grouping nicely on the target. I tested the same 1901 sight on three different rifles manufactured in 1898, 1901 and 1902 with different front sights and the correlation checked out. A few of you may find the following facts interesting: Brophy’s book added 0.003 to the front sight height (0.413” in lieu of 0.410 in Poyer) – this would lower the strike about 1” at 200 yards. The 1902 rear sight is 1.75” closer to your eye than the 1901 sight and .121” lower in full down position. Studied graphically, the 1902 front sight should strike about 16.5 inches low with a 0.410” front blade. To correct this, a lower (say 0.289”) front blade may be required.
 

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Reply #1 - Oct 23rd, 2009 at 12:13pm

Dick Hosmer   Offline
KCA Official Member
Collector of Springfield
Arms, 1865-1915
Northern California

Gender: male
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Great to have that drawing back!  I wonder if anyone else has archive copies of significant posts?

I wonder if KCA has set up a backup routine so that such data loss does not occur again? I hope so!  Smiley

In the early days of computing, with nothing but floppy disks, backup was a TERRIBLE, time-consuming, and convoluted, chore. Now, with inexpensive menu-driven mass storage devices, it should be NO problem.
 
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Reply #2 - Oct 23rd, 2009 at 2:13pm

krag1894   Offline
KCA Forum Member
Krag Enthusiast!
mount airy ga.30563

Gender: male
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Thank you for the info on the comparison with the 1902 rear sight my blade from the center pin that holds the blade in is 262 and it shoots very well at 100 yards I'm new to the forum and am thankfull for all the information posted I have a 1894 given to me from a uncle who got ot from his brother don't know where I could get  a 3/4 inch scope to fit a 1939 T-1 weaver side mount Krag 1894
 
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Reply #3 - Nov 21st, 2009 at 11:21am

msw   Offline
KCA Forum Member
Krag Enthusiast!

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greetings from southern vermont... i got a Krag from my dad before he died a few yeares ago with an old side mount badly drilled and tapped into the receiver and a weaver model 298 (?) scope atached to it.  the scope was so far to the rear that it interfered with the safety, so i took it off.  i would guess that it's a 3/4 inch (nominal; it mices to .753).

send me your 'snail mail' address if you want it- you can have it for free- i hate to see something not go to use.

drop me a note at williams@cheshire.net
 
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