I am hoping to sell a nearly full 8 lb'er to a guy that wants to load 7 mag. Anybody have any good load data? I know it needs LR mag primers, and heavier bullets. Got him covered on both. Any interchanges with modern powders?

Don't know that powder....

Hogdon H1000 is a very well known go to powder for 7mm Rem Mag. Another is Retumbo. Slow burning powders are the best performers here.

Andrew

Don't know anything about that powder either..Reloader 22, IMR 4831, and H4831 are my 7mag choices!!

WC 860 is a surplus ball powder, loaded in either 50 BMG or 20 mm. The surplus dealers sold it 30 tears ago for nearly nothing. I seem to have paid $20.15 for the 8 lb jug, and the odd amount probably includes shipping. I got it because you could use a case full behind a cast bullet in 45-70, gave black powder velocities. I sold the rifle, and the jug has been sitting in a cool, dark basement ever since.

Here's a chart for surplus military powders that shows loads for 7mm Mag with WC 860. Haven't tested any of these loads myself. You won't get top velocity with the slow WC 860 plus you probably won't be able to cram enough in the case to get into a high pressure situation. WC 860 and other military surplus powders do vary in burn rate and your lot of 860 could be faster or slower than the powder on this chart. Only 120 and 15o grain bullets on this chart. I would stay with commercial powder with tested data in 7MM Mag and sell the 860 to a 50 caliber loader.https://www.scribd.com/documen...&source=hp_affiliate

IT's 50BMG powder very slow, so I would google load data for wc860 or go to the Hodgdon site & use the slowest powder data for 160-175gr bullets. It will be best with heavy bullets.

Almost fifty years back I was loading 20mm into GE gatling guns in the nose of F-105's.

If You stuck a practice (blue tip) round nose first into the tie down chain holes in our ammo trailers, You could wiggle the bullet back and forth and get the powder. IIRC it only took about ten to make a pound.

Used to give it to a friend who loaded it in his .300 Wby mag.