In reference to the SA barrel use on late HRA:
I had never fired old 157 until recently, took it out to the range and fired 5 clips. The old girl will shoot, LC69 grouped very well and my match load of 168SMK even better, much better. The old timers here will remember this from the old forum, thought it was worth bringing up again since we were on the subject.
An interesting side note, look at the bolt, somebody nervous stamped the drawing number, look closely.
Bob Seijasdid the data sheet for the article, I took the pics.