Hammer;

Ask your outfitter if the ammo he furnishes has the CIP logo or wording: "Normas CIP" on the box. If it does then ask him to get you some 28gr loads and you will be ok. The load could be a bit faster, but the pressure will be ok. He may be using RIO's and if so their Top Target is a soft recoil. The RIO cartridge box will have printed on the side of it:"control de municion" and under that: NORMAS CIP.