Model 70

[William Davis]

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

[edgarspencer]

Mills, If I may offer a thought; If you were led to believe the gun was a .375 H&H Magnum, if it were me, I would return the gun. However popular some non-factory wildcats are, their appeal is spotty, and not one actively sought out by the general shooter.

The other thing to consider is hand loading, and whether you want to invest the time, effort and expense in loading so few cartridges.
Also, consider that some air lines, especially overseas, have restrictions on traveling with ammo. You may find yourself in the ideal location, and your ammo isn't available.

Undisclosed modifications aren't always a deal breaker. I bought a BRNO hornet to rekindle a childhood memory, only to find out it had been modified to Harvey Kilborn's version, the .22 K Hornet. It happens to be an easy one to reload, and dies, and brass were readily available, and it's everything a Hornet was, and more.