Thread: What are you using for pressure estimation in your handloads.

Originally Posted by rupert

A method that I have found to be useful for rear locking actions is to measure. the length of the case over a series of firings of an individual case with a chosen load. If the case stretches (and it is totally obvious with calipers) then the amount of powder in the load needs to be reduced to the point where the case does not measurably increase in length. My 'series of firings' is usually 20 shots of the same load. An example is a miniature martini rechambered to 17 Ackley Hornet with a 25gr Hornady HP bullet. The chosen load of IMR4064 gives a velocity of 3,400ft/sec and the case lasts at least 20 firings. By which time the neck is very hard which affects velocities but the case integrity is still secure.

Greetings @rupert and all,
Thanks for your post. I use a variation of this in my Martini and Lee Enfield rifles. I don't measure case lengths but do set loads so pressure is low enough to prevent stretching. Often the primers are backed out a little (a good sign) and the cases rechamber with ease. Only neck sizing is needed. Similar light loads were used in my .308 for short range target shooting with much the same results. Good training loads for the younger ones as well.
Regards Grandpamac.