What are the *official* 45 70 trap door saami pressures?
It seems that the published maximum varies between 18,000 to 28,000 psi, depending upon the company's reloading data. How did this variation in pressure come to be? Did it start at 28,000 psi and then get bumped down to 18,000 psi with the prospect of a lawsuit in this sue-crazy era? That 10,000 psi could be the difference of 200-300 fps with the same projectile.
Hogden is right around 18,000 psi and Barnes looks to be at 28,000 psi. Then there is this Terminal Ballistics Research site;
http://www.ballisticstudies.com/Know...overnment.html that states the 28,000 psi.
I'm not looking to load for an old trap door, but rather a 45 70 contender. For a hunting load, I need all the fps I can get from this little carbine without buggering the frame.