Rear sight height question

[Eric Krewson]

I finished my precarve from hell rifle and gave it a go on my range. The first shots were a foot low so I started filing on the front sight, I got the group up to 4.5" low and had the front sight as filed own as far I want to go with it.

I need to make or buy a new rear sight that is taller but I don't know how much it will take to raise the impact point up where I need it. my current sight is the standard Lancaster that Track sells with a base .585 long and the blade height of .220.

As near as I can tell there are no other sights listed with this length base so I would have to buy one with a longer base and cut it down.

It looks like the next step up is a sight with a .300 blade height, then a sight that is .425 tall.

I know some of you guys are extra talented in calculating the projected sight height, I have always been a shoot and file kind of guy.

How much more height would put me in the ball park for a group that is 4.5" low. I know that barrel bending is an option but have never done it.

This is my 50 yard group, .54 shooting a .530 ball, .018 ticking patch and 80gr of 2F. Not too bad right out of the box and the first load I tried, this is a Bobby Hoyt rebore that I had changed from a .50 to a .54.

I have 74 year old eyes that don't see sights well, no telling what someone with good eyes could get out of the gun.

Forgot to mention; I filed the sight for the last time between the low shot and the next two.

 

[French Colonial]

Distance from the rear to front sight?

 

[Eric Krewson]

28", The rifle is an Issac Haines with a 38" barrel.

 

[French Colonial]

28X4.5/1800= .070

you need a rear sight .070 higher

 

[French Colonial]

That’s at 50 yards

 

[Phil Coffins]

That’s a lot better then file and fire. Saves powder, time and gets it right on any gun. Works for windage as well.

 

[Eric Krewson]

Thanks a bunch, I just ordered a new sight that will do the job.

Here is the just finished rifle.

 

[French Colonial]

Very nice, I like it!

 

[White Oak]

Beautiful rifle! Good luck with the sight.
I need to keep that formula.

 

[Larry (Omaha)]

[QUOTE

Here is the just finished rifle.
View attachment 103376
[/QUOTE]
Very nice rifle, and flint to boot!!
I shoot .535 with .018 pillow ticking. If ya feel like it, try a box of .535s to compare. You already have a new sight, but for future reference........ Sight Correction Calculator
Click on the link and you will get the calculator below only it will be active.
Larry

[/QUOTE]

 

[Scota@4570]

I have found that if the bore is straight the front sight should end up about 0.10" lower than the rear relative to the bore centerline for a 50 yard zero.

 

[Eric Krewson]

My rifle won't start a .535 and an .018 patch, I tried with a very hard smack of my ball starter, it was no go.