Mattens “Handloading Ammunition” 1926 has a 1170 FPS & 1500 FPS loads Shapes “ Complete Guide to Handloading” 1937 has 1300 FPS loads.
Both specify powder that’s no longer produced SR #80 C.O.B. Advice is good on 4227. Charge weights same as SR 80.
On the Mestier Bullet. They come in two diameters right one depends on your bore. That case sure looks like a Ackley. CH4D can supply dies for it but probably easier to load it with neck sizers instead of F/L I had troubles getting F/L for a 25 Kraig, CH4D switched me to universal neck size dies. Lot better and no case fit issues.
William
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