LRF,

I do have Wright's book and read the DGJ articles on reloading and shooting double rifles. Alos read Ross Seyfried's articles in Rifle and other rags. Started shooting double rifles in the early 1990s. I experimented a lot to get my rifles to regulate.

In checking how a rifle regulates, I load both barrels before shooting the right barrel. I believe it is important to have the weight of the loaded cartridge in the left barrel.

Most double rifles that I have shot will shoot differently when the barrels warm up. Also most double rifles shoot differently (for me) depending how they are held and sometimes "misbehave" when shot off the bench.

When I shoot NfB, I use a filler to keep the powder against the primer. I now use an open cell foam popcorn and in the past, had used Pufflon (loose, not compacted). I recently shot my 295 rook using Reloader 5 and noted that if the powder wasn't against the primer, the velocity was much lower than with the powder against the primer.

BTW, even though I have shot double rifles for some 30 years and single shots much longer, I am still learning. I have a 43 Mauser and a 577 Sinder double rifle that I still to find what they like.