FWIW, When I first got into shooting these old, wonderful doubles, I used the highly recommended 7625 powder, because of the lower pressures available. However, I found that I could get similar low pressures with Nitro 100, one of the fastes buring powders available. The difference being: about 15 grains of Nitro 100 produced the same velocity as 24-25 grains of 7625. I was convinced I could feel more recoil with the 7625 loads. As a result of this, I've been using Nitro 100 ever since. No problems with cold weather. it doesn't get extremely cold in Southern Utah and I don't go shooting, if it does. The obvious reason, to me, for Thomas's "personal explanation" is once again, the different weights of powder charges involved. Faster burning powder requiring lighter charges. That's why it's in the recoil formulas.
Good post, Larry


> Jim Legg <