Originally Posted by sambubba
This came out in the late 70's or very early 80's and was originally packaged in gallon milk jugs. Bob Hagel said it was surplus IMR4831, and I used identical loads for MR3100 that I had been using for IMR4831 at similar pressures. I don't know anything about XMR3100.
Craig, let me make sure I understand what has happened. You have in your possession a gallon of old IMR4831? But you are using 3100 data for loading it? In your first post, you wrote "mr3100."
So, I'm a bit confused.
The only 3100 I am aware of is what is now called "XMR 3100." It is formerly known as Accurate Arms 3100 or simply "AA3100." That is how it was labeled in the 90s when I used a lot of it.
I will assume that if you have something labeled "3100" it is from accurate arms and is the xmr3100.