Originally Posted by Broz
OK, so I have a rifle and want the next one I build to have a little more free-bore. I have a measurement from the case head to the O-give (where the bullet touches the lands) but no reamer specs to know what the current reamer had for free-bore. How do I get a measurement on the current rifle's free-bore so I know what to order for the next reamers free-bore?
In your case, I would make a chamber cast of your chamber using Cerrosafe because it will show
everything even the condition of the lead. Cost about $20.00 bucks.
Once you make a casting of your chamber it is easy to measure any part of the casting. Just
be sure to follow the instructions TO THE LETTER.
It is very hard to measure a reamer and you must be careful what you measure it with because
most Micrometers anvils are very hard and can damage a fine reamer.
Have you have tried the maker to see is he has the reamer print for it ?
PS: If the barrel and chamber are good you can buy a throating reamer and do what ever to the
free bore you want. In fact this is a good way to experiment with throat/free bore length using
the old barrel before you re_barrel with a new barrel
I hope this helps
J E CUSTOM