Hollow points typically work well in Lugers. I think the warning about not using them stems from the fact that factory hollowpoints are usually more powerful than standard ammo and just put more stress on the whole P.08 system.
Many reloaders find that using hollow point bullets in conjunction with a reduced powder charge is ideal for Lugers. Better accuracy and less stress on the parts, or at least that has been my experience.
Mac Cat's suggestion to use Winchester White Box or PPU is good. Blazer Brass is also mildly loaded.
One last suggestion I would make is that German military 9mm ammo used a 123 grain FMJ bullet. However, 115 grain ammo shoots just as accurately and puts less stress on your pistol by virtue of the 115 grain bullet's lighter weight impacting the frame and breechblock with a smaller foot-pound energy strike. 90 grain 9mm ammo is even better in this respect but often exhibit reliability issues with the action cycling.
-Bob
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