For those following this link who might be interested, the article by Dave Wolfe was in Rifle issue #13 in 1971. The publishers should still be able to supply by email. Some good and still relevant data there. Jeff Munnell published in The Accurate Rifle Magazine, probably around the 2002 era. I don't have the exact date of his 5,6x61 SEvH article as I only have his manuscript. Also he published articles on 8x72R, 8x68S, 9,3x62, the various 8mm cartridges (such as 8x57R/360), 9,3x72R, 9,3x74R, 9.5x57 Mannlicher-Schoenauer and even one on the .30-06.
Jeff made 5,6x61 SE vH brass using 9,3x62 parent brass and sized the neck down in 5 separate passes, using a .350 Rem. Mag sizer die, 7.5x55 Swiss full-length sizer, .284 Win. full length sizer, 6.5 Rem, Mag. full length sizer and finally a 5,6x61 SEvH full length sizer. The full instructions are in his article. The 9,3x62 Norma parent brass has a .473" head diameter when actually measured. His 5,6x61 SEvH brass was .476", so it was a much better fit than .30-06 or 8x57mm, for instance which were both 8-10 thou smaller.
It's getting harder to import firearms related material from the USA or EU, so this may help someone in need.
