I have a used Savage with a shilen barrel in 6mmBR. I have a question: I have some Lapua brass the neck wall thickness is .013 if you add .013+.243+.013= .269 when I measure a fired brass it measures .270 is there some springback in the brass or is this neck to tight?
6mmBR loads
- Thread starter Shaun Miller
- Start date
Re: 6mmBR loads
The most common amount of brass spring back is .001".
Thin brass springs more.
Large diameter springs more.
Work hardened brass springs more.
I like to measure chamber necks with pin gauges.
I originally got pin gauges for lathe and mill work, but now have a set in the reloading room.
If you knew the chamber and there was .001" clearance with the measured loaded ammo necks, that would be enough clearance.
I have a 6mmBR reamer with a .272" neck.
I have a Forster 6mmBR sizer die with a .265" neck [measured with pin gauges].
I have enough clearance with RP or Lapua brass, no turning required.
The most common amount of brass spring back is .001".
Thin brass springs more.
Large diameter springs more.
Work hardened brass springs more.
I like to measure chamber necks with pin gauges.
I originally got pin gauges for lathe and mill work, but now have a set in the reloading room.
If you knew the chamber and there was .001" clearance with the measured loaded ammo necks, that would be enough clearance.
I have a 6mmBR reamer with a .272" neck.
I have a Forster 6mmBR sizer die with a .265" neck [measured with pin gauges].
I have enough clearance with RP or Lapua brass, no turning required.
Re: 6mmBR loads
If your chamber is a .272 you are perfect!! Dont worry about a thing just go shoot!! Lee
If your chamber is a .272 you are perfect!! Dont worry about a thing just go shoot!! Lee
