Originally Posted by tex_n_cal
Originally Posted by Mule Deer
Unless they've changed it since I got my last batch, MRP is very similar to Reloader 22 in every way I can see and measure. In fact, my present lots of each produce exactly the same results in some recent, extensive handloading tests with the .270 Winchester.


That was my impression as well, when I broke down a factory load.

Related topic, the manuals all seem to stop at velocities a good deal below Wby factory loads. Is that because the bullet companies are using test barrels with standard throats, and Wby loads for their rifles, which are known for really long throats?


Exactly correct. I have copies of old Weatherby Guides, where reloading data is offered to include factory specs. I've tried MRP/RL-22 loads in the 257, 300, and 340 and they all duplicate exactly.

A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”