Interesting find - Lapua brass

Kelly Timoffee

Kelly Timoffee

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Prince Albert, Sk
Not so long ago I figured I would try Lapua .308 brass sized to 7mm-08.

Sizing process was, FL re-size , neck size with collet sizer, anneal, fireform with cornmeal loads, then start loading and firing.

I am now hitting my 4th load, the brass after the second firing was about 2.013"-2.015"(started life at 2.005") , after two more loadings it hasn't grown beyond 2.015".Still have suitable neck tension and wall thickness.Not even close to trim length yet.

I am wondering if anybody else has seen this or if using the collet sizer is saving the brass from stretching.

I am running a moderate load at 2650 ft/sec.
 
I'm using 308 Norma brand brass sized in full lenght die to 260. I didn't form fire, just loaded and fired. I didn't check it at the start but I am still to short to trim after 3 firings. Running about 2725fps with 129gr bullet. Only full length sizing.
 
Lapua brass is exceptional. I have 260 brass made from both 243 and from 308, and I made 6mmX47 from 6.5X47. Stretching and flowing has never been a problem.
 
Al-Sway said:
Why would you fireform 7mm-08 cases? All you have done is neck the cases down?
Click to expand...

Legitimate question.... If he only neck sizes his brass (A very common high-precision preference) the brass body benefits from fire forming to his particular chamber, but ALL re-necked brass benefits from proper forming at the neck shoulder juntion. No die or expander mandred does a perfect job.
 
OK. Seems like a lot of extra effort for potentially marginal returns over shooting bullets and load development. However, each to his own.
 
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