How to figure higher front sight?

[Scooter22]

My son put a Skinner rear peep sight on his Marlin 336A 20" 30-30. It now shoots 9" high at 50yds with rear sight bottomed out. Whats the best way to determine the front sight height he needs? Thanks

 

[Fine Figure of a Man]

This might help.
https://dawsonprecision.com/sight-calculator/

 

[Varminterror]

Dawson and Brownells both have sight height calculators on their websites. Both work. Pretty simple geometry, but the online calculators are faster and easier.

 

[troy fairweather]

I have used modeling clay to add on to the sight just to shore to get the right one. And some black marker to help see it better

 

[Infidel]

Or you could use the idea of similar triangles to determine that he needs a front sight that is about 1/8" higher than the one he has now.

 

[LoonWulf]

wow....my glue a tooth pick to the sight and cut till its right and measure that, seems really.....bubba now.....

 

[Art Eatman]

This sort of front sight; install and file as necessary:

https://www.brownells.com/rifle-par...el-black-sku078050000-341-1608.aspx?rrec=true