The Aussie Copper ACP 375285 will not work with the Schoenauer magazine.

I finally bought some and on receiving them instantly saw that they are spire point (not somewhat rounded and fuller toward the tip as their photographs suggest). They also are .374, not .375.

These were the ACP .375 285 Sidewinder. The Thunderer was not available from Graf & Sons, from whom I had ordered.

I called Graf & Sons and they issued a return authorization (for refund), no muss, no fuss.

The ad. showed this (may have worked with MS).

They arrived like this.

So, for future reference, Aussie Copper ACP375285 will not feed in a M1910 Mannlicher Schoenauer magazine. They could be used as a single shot proposition.