Some of the jacketed hollow point bullets are shaled a bit like the truncated cone bullets that Lugers were designed for. The Lyman 1.075 OAL is, in fact, what I used recently with some Lead Truncated Cone shaped wad cutters I bought recently. They seem to be working quite well. I loaded these with Hodgen TiteGroup, so my powder data wouldn't help you.
I've been told that the Mauser era metallurgy resulted in stronger steel than what was used in WW-I pistols. I don't know if this is true, or where facts can be found on this.
I generally am pretty conservative when working up a new load, regardless of the pistol.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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