one shot more (now 3) in the magazine of my .458 WM / mauser 1909.- as achievement? that alternatives do I have?. I'm sorry for my bud English. Thanks in advance, Hector

Your English is fine; if you are now getting three rounds in the magazine now, in a 98 Mauser, you are doing well. I would not do anything.
But if you want more, you need an aftermarket trigger guard/magazine, that is deeper and wider than factory.

Try Duane Wiebe's magazine and bottom metal. He posts here.

Cheers Chris

Coffin floorplate. Not sure in your neck of the woods can make you one though. A new complete deeper bottom metal will require a new stock.
Don

Thank you for the answers. Besta Regards, Hector