Thread: Pressure Signs in the 6.5x47

Originally Posted by Puffin

I'm not recommending that shooters disregard actual signs of deformation in their fired cases in favour of theoretically calculated pressure. I am however interested in whether the calculated peak pressures for certain signs of strain that they do see are widely spread or clustered. As I said in my initial post, having assessed my own cases in the past - mainly for case head expansion measurements - I was surprised at how similar the figures were across a variety of cases. Admittedly I had control of a number of variables that could otherwise have caused wider variation. Your figure of error of 10,000PSI may well be correct when these variables are not controlled.

This thread is going to be of interest and read by very few on here anyway. The pool of 6.5x47 shooters here is small. Fewer still have ways of assessing pressure other than with the conventional indications used by reloaders. So far I have a data set of only one.
If you really think that I am confusing people in a way that is dangerous I can take this topic off-line and PM the shooters of this round that I know of directly.

I think this topic may be of much wider interest than you realise as the availability of Lapua brass for the 6.5 Creedmoor makes this discussion of direct relevance as far as I can tell.

In my 9 months worth of experimentation with the Creedmoor I haven't seen any really obvious signs of pressure in my brass. Then I tried Re26... After a lot of research I decided to try up to a max of 48 grains behind the 143 ELD-X in Lapua brass/CCI450 primer. The top load had some extrusion of the primer in to the firing pin hole. This powder also shot poorly from my rifle so I gave it up totally. So my limited results backs @gimp's experience.

Anyone who has converted Palma brass to 7mm08, 260 or 243 might also want to chime in as well.