Well, I loaded a bunch of them several years ago. Out of two Winchester 94s, a 1959 20" and a 1977 Trapper Commemorative, I got better groups out of my open-choked shotgun. And these are guns that shoot just fine with jacketed bullets. I do not remember what my powder was. I'm a Berry's fan for pistol stuff.
I use a Lee Factory Crimp die. I’m just getting started with loading 30-30 but no issues thus far. I can measure the amount of crimp when I load some more. I know I started at .379 once the bullet was seated but never wrote down what I crimped to.
I don't have any experience with plated bullets in a rifle, but have loaded and shot 10s of thousands in pistols with great results. Mostly Xtream heavy plate..... I know that's not what you asked, but my computer's been on the blink, and I just wanted to participate
Well, this just got interesting....Sounds more like a neck tension issue than a crimping issue. Years ago, I had an issue like that with 9MM pistol ammo, seemed the more I crimped the looser they got. I discovered that I was bulging the case slightly. I’m not sure you can do that with a bottle neck cartridge, but I know you can’t bulge the neck with a Lee factory crimp die.
Have you checked the diameter of the bullets? Have you had any issues with jacketed bullets? How about the diameter of the expander ball?
Do these particular bullets have a crimping groove (cannelure)? If so, you can crimp on one edge to prevent bullet “pull” like you would for magnum revolvers, and the other edge to prevent bullet set back, like you would do for tube feed magazines.
Interesting, it shows a diameter of .309, which sounds like they are sized the same as you would expect cast lead bullets to be. These should be plenty tight in the necks of properly sized .30-30 brass, one would think....
No just loaded 10 test round 5 with 4064 and 5 with Unique . Trimed all brass to 2.029 and col was 2.520.Used lee fdl die . Loaded in rifle and cycled them starting was 2.520 after about 2.517 to 2.513