front sight blade hieghts

[AggiePharmD]

Alright educate me. Shooting a 1917 with a load of 18 gr 2400 and the 311299 at 200 gr. Utilizing the folded battle sight what will a taller front sight do to the poi?

[Mk42gunner]

Lower it.

With iron sights remember the acronym FORS, Front Opposite, Rear Same when adjusting sights, i.e. moving the front sight up (or installing a taller one) will lower the point of impact.

Robert

[Scharfschuetze]

To add to what Mk42 said, you can estimate the amount of zero change needed by these formulae:

Sight radius in inches X 2 X 3.14 / 360 / 60 = 1 MOA in thousandths.

or

Sight radius in inches / range to target in inches X error on target in inches = sight change in thousandths of an inch

I just generally use .008" per 1 MOA for most service rifles with an aperture sight on the bridge like your US Model 1917, 1903A3, the M1 GArand or the M14/M1A.

So if you need to raise or lower your impact 10 MOA (roughly 10") at 100 yards, just multiply 10 X .008" for 8/10ths or .08" adjustment. This will work for any range if you distill your error on target into an MOA correction.

the two formulae will differ slightly in their result, but any error between them will be well within your rifles grouping ability. They are also applicable to deflection corrections as well.

[leebuilder]

Good info in the replys,
You must lower to gain elevation. Most service rifles front sight were .015" apart roughy two inches at a hundred m.
i use rear sight is your buddy, front sight is not and must be moved opposite to what you need.
I usually raise the rear to 600m/y position at a hundred m, almost always hit a sheet of paper when shooting cast.
be safe

[Scharfschuetze]

I usually raise the rear to 600m/y position at a hundred m, almost always hit a sheet of paper when shooting cast.
be safe

As I like to leave my rifles in "as issued" condition, I just use the ladder sight for most of my shooting with the US 1917 and the British Pattern 14 rifles. My zeros are similar to Lee Builder's zeros when shooting cast boolits. That battle sight is set to achieve maximum grazing fire range against a standing man, so it really is zeroed at something close to 350 or 400 yards with ball ammo. Depending on the load that I'm shooting, it is sometimes fairly close when using cast boolits.