An interesting thing about the 7x61 S&H is the depth of the extractor groove on the cases. I have some original Norma Re. cases, some older Norma 7x61 Super cases and some brand spanking new Norma 7 x 61 Super cases.
The older cases - both the Re. brass and 7 x 61 Super - have narrow-shallow groves that won't fit into a standard RCBS #4 shell-holder meant for the belted magnums and I have to use a #43 meant for the Winchester Short Magnum rounds. The new production 7 x 61 Super cases have a deeper and wider extractor groove that does fit easily into the #4 holder.
As mentioned elsewhere on the forum the Original 7 x 61 Re. brass is thicker and a lot heavier than most belted magnum cases. The old Re brass I have on hand weighs in at ~260 grains which is about 30 grains heavier than some cases re-formed from Winchester 7mm Remington cases. The 7x61 Super brass is even lighter with all the old stuff I have weighing in within half a grain of 212 grains. The current production Super brass also weighs in at 212 grains which shows Norma has maintained some pretty good consistency with production runs over 20 years apart.
My 7 x 61 has a 1 in 12 twist and does best with a 139 grain Hornady SP and Nosler 140 grain Partition bullets. The rifle also shoots the 160 grain Speer Deep Curl flat-base bullet very well but any bullet longer than that does not stabilize properly. The 160 grain Trophy Bonded Bear Claw - another flat-base bullet - has a different ogive shape making it slightly longer than the Deep Curl and it does not shoot well at all in my rifle. The best results I have had are using IMR 4350 and IMR 4831 powders.