Sight height question

[tek4260]

I have a bit of a problem with the 480 Vaquero. It shoots high with my load... about 15 inches. The load is 22gr of H110 with a 400gr cast, probably running in the neighborhood of 1100fps. How much would I have to add to the front sight to get it regulated? I tried an online sight height caluclator and I figure I will need to add about .120. Does this sound right?

I called Huntington and he will replace the front for free under warranty, but I want to take a deer with it this season. So I ordered a new allan foundry sight from Brownells that is 15mm high that I will rough shape and install until I send it in. Of course since I am going to be without it while he works on it, it needs more than a replacement sight:) I want 4 5/8, and he is leaning towards 4" and S&W style adjustable rear. I'll post some pics when it is finished.

Here is the 2 shots after I moved the target lower on the box. Gonna be a shooter!

http://i292.photobucket.com/albums/mm35/tk3945/101_2556.jpg

[tek4260]

http://www.brownells.com/.aspx/pid=55/Product/OVERSIZE_DOVETAIL_FRONT_SIGHT

Here is the front sight that will be in today. Just trying to see how much to initially shorten it when I install it.

[Hickory]

You can try a lighter boolit at a higher velocity. If possible.

[Tatume]

You need the distance between the front and rear sights, the distance to the target, and the amount of vertical change required (15"). Everything must be in the same units; I'll use inches (25 yards = 900 inches). Let's say the distance between the sights is 8 inches. The additional height of the front sight required to move point of impact 15 inches is (8*15)/900 = 0.133 inch.