I know this has been touched on previously in a thread some time ago.
Just wanted to let some in here know how it actually works.
I had Bill Leeper build me a 308 Norma Magnum about a year ago.
It is on a 700 Remington action, and Bill did a very fine job.
The chamber is cut to what appear to be minimum SAAMI specs.
Net result is good velocities with powder charges lower than many listed.
However, in trying to size some existing 1F 308 Norma Magnum brass I had, I found I could not chamber it, because the pressure ring just ahead of the belt was too large, even with the best sizing die I had [I have 3 sets]
Even with the die set down to "bump" over hard, the problem remained.
In measuring the resized brass, I found the pressure ring was .512"-.5125"
If I measured a 1F case from this custom rifle, it was .511"
What this meant was that I had some 180 1F cases that were useless to me in this rifle. [I have another 308 Norma Mag rifle that they fit in easily]
But I have plenty of cases for the other rifle already, and wanted to use the brass on hand rather than buy the expensive new Norma stuff.
A little research found Innovative Technologies [Larry Willis]
They make a special collet die to reduce this pressure ring to factory new specs.
So I ordered one up to try and see if I could use my stock of 1F brass.
Voila!! It works better than I could have imagined!! It reduces the pressure ring to .5095-.510", and the brass now chambers with ease.
I have since acquired small quantity of 308 Norma Mag brass that has measured as large as .514" at the pressure ring.
No problem!!
One pass through the FL sizer, and one pass through the I.T. Collet die, and I'm good to go.
So if you have a belted magnum with a min spec chamber and want to save some brass that is too large at the pressure ring, this is the tool that does the job. I consider it money well spent.
Regards, Eagleye.
Just wanted to let some in here know how it actually works.
I had Bill Leeper build me a 308 Norma Magnum about a year ago.
It is on a 700 Remington action, and Bill did a very fine job.
The chamber is cut to what appear to be minimum SAAMI specs.
Net result is good velocities with powder charges lower than many listed.
However, in trying to size some existing 1F 308 Norma Magnum brass I had, I found I could not chamber it, because the pressure ring just ahead of the belt was too large, even with the best sizing die I had [I have 3 sets]
Even with the die set down to "bump" over hard, the problem remained.
In measuring the resized brass, I found the pressure ring was .512"-.5125"
If I measured a 1F case from this custom rifle, it was .511"
What this meant was that I had some 180 1F cases that were useless to me in this rifle. [I have another 308 Norma Mag rifle that they fit in easily]
But I have plenty of cases for the other rifle already, and wanted to use the brass on hand rather than buy the expensive new Norma stuff.
A little research found Innovative Technologies [Larry Willis]
They make a special collet die to reduce this pressure ring to factory new specs.
So I ordered one up to try and see if I could use my stock of 1F brass.
Voila!! It works better than I could have imagined!! It reduces the pressure ring to .5095-.510", and the brass now chambers with ease.
I have since acquired small quantity of 308 Norma Mag brass that has measured as large as .514" at the pressure ring.
No problem!!
One pass through the FL sizer, and one pass through the I.T. Collet die, and I'm good to go.
So if you have a belted magnum with a min spec chamber and want to save some brass that is too large at the pressure ring, this is the tool that does the job. I consider it money well spent.
Regards, Eagleye.
