I will pop a bit in here. I have been playing with the 30-30 for the better part of two years trying to find good cast plinking loads. Also some lower powder jacketed loads.
For full power jacketed I use I 3031, H4895, BLC-2 and H335 Other than not really liking BLC-2 I havent done enough to find one really any better than the others. SO I load what I have on hand.
Cast is different story. I have loaded about 1500 different combos of those in two years.
Store purchased cast I use lazer cast 170 gr sized at .309 and .310.
Gas check and not. These bullets are very hard cast some thing like 23Bn.
These do not seem to react to well to pistol powder loads. Cant even get them to print in 8 inches at 100 yards.
With the noted exception of Trail Boss Powder. 9 grains of trail Boss will clover leaf these at 50 yards all day long. Must have to do with the higher pressure this powder is working at.
This bullet also works well with H4895 gas checked. You need to have the pressure on to get these to fly.
The main reason I added that about the store purchased cast is because if your not casting your own. You are buying them. if your buying them your getting hard cast. Hard cast in my opinion and experience is not the right mix for low velocity plinking. Too bad too because I have about 1500 of them.
Casting my own using a softer melt maybe 13 Bn to 17Bn. And thats good because petty much any lead you find will work good.
Using the LEE 150 gr and a NOE 170 gr bullet.
I get pretty good results with Unique and also with Universal.
8.5 gr Unique seems to be the sweet spot No gas checked is fine.
But the best of the best is 16 gr of 2400 behind the LEE 150 gr sized to .309 gas checked. Kicks them out of both my M336 and a Savage 340 at about 1800 fps and hits where you aim them every time.
Load some up and see for your self.
170gr NOE plain base and GC base.
This is what you can get with the 2400 load at 100 yards.
Another plinking load I have been playing with some. Is to take a 115gr 32-20 pistol bullet and size them down to .310
These make a pretty light, cheap, Low recoil load.
Again using hard cast bullets, the results pretty much sucked. Except with Trail Boss.
Soft cast again does a fantastic job. Ahead of 8 gr Unique.
There now... Go have fun.