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With all due respect to Sherwood Scuba Rep the magnum will be just fine up to 40%. I've been diving nitrox with Sherwood regs since 1997 and I'm still typing.
If you choose to do otherwise that is your decision.
I am not the official spokesman for Sherwood Scuba, I am one of the sales representatives. I already knew that...it was a rhetorical question
But here is my line of thinking, if Sherwood or other regulator was to list every gas the regulator was not intended for the list would go on and on. For example, not to be used with Nitrox, not to be used with Argon, not to be used with Tri Mix, why can't it be used with trimix? I don't dive trimix nor do I mix it, but doesn't trimix usually have a lower O2 content than the compressed air we normally breath? not to be used with Acetylene.... you get the picture. You're talking about common sense now. The average person knows not to breath Acetylene for any reason. There is no reason a regulator (any brand) can't be used for Argon - just don't breath it!!
No where in the Sherwood manual does it state "ready for Nitrox use", so why would we assume that it is ready? Because it is not specifically excluded. Other regulators promote that fact that they are Nitrox Ready, and we know why that is why would we assume it is safe to with Nitrox if the manual doesn't say that it is okay?
There are a couple of Sherwood Regulators that are Nitrox Ready out of the box, those are the SR1 and the Gemini.
Hope this clarifies things a little better. Actually it didn't clarify anything. The bottom line is hundreds or thousands of divers have been using "out of the box" regs of all brands for years without incident and will continue to do so in spite of what a company rep says on an internet forum.