"I tend to shoot a hundred or more rounds at a time per pistol when I'm out playing."
If you can do that with factory loads, in a 45-70, your a better man than most
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I have had one for a few years now. I have shot everything in it from a 250 grain wadcutter to 500 grain spt type. The 500 is not recommended in the contender. I found some load data trapdoor loads for a 500 and loaded a few just to try. It is not supposed to shoo them very well. I had a pleasant suprise, they would stay in a nice 3" cluster at 100M, for 5 shots.
I played with it quite a bit one summer and ran across some good loads. It was shooting well enough that I decided to shoot a round of IHMSA with it. I ran 350's for the first 30 and the 500's just for the novelty of it on the rams. The rams didn't fall over they jumped off of the rail. I had a pretty good crowd watching the rams as the splash was about from the middle of the back to the bottom, like a big white line.
That was about as many as I have ever shot at one sitting. BTW I encourage you to shoot it as the last gun of the day rather than the first, it can and will take its toll on you no matter how big a fellow you are.
This was all with cast bullets by the way. I have not shot nor do I ever plan to shot a jacketed bullet in it.
14" SS hunter barrel.
I ran a load ramp that samme summer, there were about 40 rounds to go through. The last 10 I had to have my shooting buddy run them as I had all Iwanted.
I found for the most part that a mid range load or less to shoot as good as a top end in most average weights witha cast bullet. You don't need speed here as this thing has more energy left at 100 than a lot of calibers do at the muzzle.
Jeff