I have a 264 Win Mag and do my own reloading. I recently saw a video by ammo smith on how to make your won AOL gauge.
The method described was to insert a bullet a fraction into a case and then push the case and bullet into the chamber. The lands will then exert pressure on the bullet and push in back into the case. Extract the bullet and measure the full length to determine where your lands are and calculate accordingly your seating depth.
I did the above with a Sierra GK bullet which is quite long. The bullet did not even tough the rifling. I preceded to color in the whole bullet with a sharping to see of the bullet even touches the lands, but still nothing.
Any inputs on what is wrong will be appreciated and a remedy.
Do I need to look inot re-barreling the gun.?
First I would do a chamber cast using cerrosafe (Brownells has it). This if inexpensive and will show
the amount of throat and the wear.
Cerrosafe is a very low melting metal (Around 150o F ) and can be poured in the chamber after
plugging the bore with a patch or ear plug. (Only fill the chamber 1/2 full)
After a few minutes tap it out with a dowel or a cleaning rod with a patch on it.
J E CUSTOM