In the UK many 6.5x54's became obsolete when the Deer acts put a min muzzle velocity of 2450 fps for rifles used on deer Scotland. Suddenly many Mannlicher's became obsolete overnight if they continued to use the 160gn bullet. Incidentally, the same applied to many 303 Lee Speeds and other fine rifles.

However perfectly possible to load 140 gn bullets at 2650 fps plus. Indeed Kynoch Ammo make a load at 2,700fps. Legally no longer obsolete. The Kynoch load does look like the bullet is not seated deeply in the case - http://www.kynochammunition.co.uk/6-5MS.html

Also there are plenty of Mannlicher Schoeneurs in 270, 7x57, 243 etc made in the 1950's and 60's and all feed fine with Spitzer bullets.