I'm considering using some Norma MRP for my .300 Weatherby, specifically with 165 grain bullets and was wondering if anyone had any experience using this powder in this cartridge. I would like to know how velocities compare to IMR 7828 or H4831sc.

Also, I read on this forum or another some time ago that some (or all) Norma powders were the same as Alliant powders, the only difference being the name and package. Anybody know if this is the case or was the person simply ill-informed?

I haven't used MRP in my 300 WBY, it's very hard to find around here. However I also have read in a couple of articles that MRP and RL22 are the same powder. Same for RL19-204, RL15-203. I don't personally know if this is true or not. I believe one of the articles that I read was written by Bob Hagel and the other by Jon Sundra. FWIW - Dan

I use RL-22 in my .300 Weatherby, simply because the MRP has not been available until recently. The MRP is slightly faster burning than the RL-22 on the burn-rate chart I have. It also shows the IMR-7828 to slightly slower than MRP.There use to be quite a few loads shown using the MRP, but then for a while is was not obtainable.

I use Norma MRP in a .338 win and get it from Graf & Sons in Missouri.

Check the following link to Norma, chose english then loading tables.

http://www.norma.cc/

They have data for the .300 Wby using MRP & MRP-2.

Delta Hunter

I use MRP in my .300 win now and then and it works great - my best velocities I've got from RL-22.

Anyone who states that the Reloader powders and the Norma Powders are identical don't know much about powders!

It is true that they have almost identical burning rate so that Norma MRP-2 relates to RL-25, MRP to RL-22 and the list goes on as Dan states! And it's true that both powders are made in at Bofors in Sweden - but......

Norma powders are single base powders Alliant Reloader powders are double base powders! So they are by no means identical!

If anyone states that give him a can of e.g. MRP and RL-22 and load the same charges- then let him see if he gets teh same velocity form the to loads! RL powders gives the highest vel. every time. In my .300 win the RL-22 load is about 50-100 fps faster with 180 grains bullets.

Regards

Mads

Thanks guys, I appreciate the information.