How many of you used this in the past and how close did it work for you?

I have a caliber that is not in any of the load books. It is a 9.5x57 M-S caliber in an M-1910 Mannlicher Schoenauer carbine. This is a REALLY nice gun. I don't want to hurt it.

I got a set of Mannlicher Collectors Assn. newsletters for the last 15 years or so and read every one. They only had ONE load for the 270gr and IMR4064 powder. It was 46.0gr supposedly giving 2,150fps which exactly matches the factory load.

I worked up from 36.0gr to 46.0gr and had absolutely NO signs of excessive pressure. Nothing on the primer, nothing on the case face, no change in the bolt lift. It seems like a mild load (other than the recoil, which is expected in a 6-1/2" gun with over 2,800foot-pounds of muzzl energy). The velocity was only 2,190fps, but I figured that the published load was taken from a 24" barrel instead of the 20" one I have.

I just ran some figures through my old Powley Computer (which shows you how old I am). The velocity came out right on. The pressure shows 40,500psi which is way under what this gun is supposed to be able to take. From the Powley, I should be able to go up to 49gr of 4064 to get 2,150fps and still not exceed the pressure limit of 45,000psi.

Sorry about the errors. I need to proofread more. The 270gr was for a jacketed bullet. The gun weighs 6-1/2 pounds, not inches. And the measured velocity was 2,090fps (below factory, not above), not 2,190fps.

I had a rifle cahmbered for 6.5-300 Wby and used my Powley calculater to figure out where to start.

I was amazed at how closely it predicted my velocities. Powley's contraption calling for 3,400 fps, I actually got @ 3,340. Closer than many loading manuals. Tedious to figure out, but darned close.

The standard cautions are:
a) It will not do ball powders reliably, since it was set up for older extruded IMR powders, don't let the similar burning rates fool you.
b) Powder burning rates have changed over the years and may vary enough to cause problems.