Finding chamber OAL

[Jackalope33B]

Anyone ever try this method? Pros? Cons?

http://bulletin.accurateshooter.com/2011/12/tool-tip-make-your-own-length-to-lands-gauge/

 

[TexIndian]

Re: Finding chamber OAL

I've been using that method since the 80's. That was the standard way of finding the lands back then, except we used a hacksaw or round coping saw blade to cut the slot. I bought the Stoney Point tool when it first came out but I've gone back to the slotted case because it let's me close the bolt to get a real reading of where the breech face is.

You may have to play around a bit to get the neck tension just right (I only make one cut that slices opposite sides of the neck). Too loose and the bullet can get moved around while extracting the dummy round, too tight and it can get stuck in the lands.

 

[gau17]

Re: Finding chamber OAL

try this:

http://www.youtube.com/watch?v=Jv-D1mEI514&feature=youtube_gdata_player

 

[MALLARD]

Re: Finding chamber OAL

that method is popular , there are variations of it. Personally i dont people should really care what is their exact number. You should determine your ideal seating depth from doing a seating depth test. This is usually done in "big" increments like .020 or .050 ( maybe 5 different lengths total) , after that you would do a finer test , like .005, around whatever COAL showed potiential. But i guess you need some sort of method to figure out where to begin. I like using a bright light and some shinny bullets , i increase the COAL until i see blemish marks and i work around that.

 

[mnchopper]

Re: Finding chamber OAL

I cut the neck of a shell so that its still snug on the bullet and drilled the primer hole out and threaded it and then threaded a piece of steel brake line and screwed it into the shell casing and have a steel rod that fits inside the steel line, I insert the shell with the bullet set deep in the shell neck I use the steel line to insert the shell into the action and use it to hold it solid and then push the bullet out with the rod till it hits the lands and then remove and measure the length I do it several times to make sure I am getting a correct reading.