Your 830 looks identical to mine. Only thing that band was designed, along with perfect fitting to the wood, for accurate shooting, by taking the vibrations out of the barrel on firing.
If I was you I would just load to the velocities the 30-30 was designed for, but many loading charts show lower speeds. The 30-30 with 170 grain bullets was designed for about 2220 fps, with a pressure of about 38,000, or so. I have tested some pretty old CIL loaded cartridges and they made right up around the expected speed. There are several powders out there that will make at least 2100 fps without going over the designed pressure of about 38,000. I will shoot the same loads in any 30-30 I have including my Model 1894 30 WCF, which was made in 1906, making it a 110 year old rifle! Even it was designed to shoot 2200 fps with 170 grain bullets.
It will take at least 32 grains of 30-31 to get that velocity and that is about tops.
One thing to remember is that most loading companies designed a 170 grain bullet, flat nose with lots of lead showing, that was an absolutely perfect design for killing animals. A perfect example of this was the 170 grain bullet as loaded by CIL in their Dominion ammunition and was responsible for killing so many moose during the meat hunting days of the great depression. Even Jack O'Connor used to say that the 30-30 killed game beyond what would be expected of it, going by the ballistics on it.
Thus, for a hunting load I wouldn't even dream about using Nosler Partitions, the Barnes bullets with the fancy designations, or any other "superior," bullet, but would just load up the old fashioned 170 grain model at regular speed. You can get about 150 fps faster without excessive pressure, by using the newer LVR powder. Hodgdon's show 36.3 grains of LVR for about 2330, but it took 37 grains for me to get to that speed. That would be my one and only hunting load for the 30-30.
150 grain pointed loads will still not make the 30-30 much of a whizzeroo at flat shooting. At a popular shooting contest we used to have, one division used lever action 30-30 rifles and the longest shot was 300 yards at a plywood, paper covered mountain goat, with a scoring target on him, just behind the shoulder. I had a good aperture rear and fine bead on the front, sighted in for dead on hold at 200 yards. We shot single shot, so I loaded pointed 150 grain bullets. Thus, I had to hold low at 100 and 150, dead on at 200. At 300 I held the bead resting on top of the goats shoulder, and the bullets would hit very close to the 4 inch 10 ring on the target. Therefore, the bullets dropped a over two feet at 300 yards, when dead on at 200.
