Thanks, 470Rigby

A Cerrosafe cast of each chamber, including the first few inches of the bore is the first thing I do when starting to develop loads for a double rifle. It was from my casts that I concluded I should use the .411 bullets.

Graeme Wright's book is under my pillow each night. It is full of good practical advice.

From the result of the loads I tried I am inclined to try 80 to 81 grains of H4831. Since you have used 80 grains of IMR4831, let me ask - Do you feel the need for a filler with the lighter load? How far do you think a load of H4831 can be reduced in this cartridge, and at what point do you think a filler is necessary?

I seated the bullets to the cannelure with a slight roll crimp.

I have not chronographed the load.

It boils down to the fact that my basic question at this time is about the use of filler. What can you or anyone suggest?

Thanks,
CptCurl