Ed, I don't think there are any P17s. A P14 or mod 17 maybe. The receiver is strong enough for any cartridge. Custom parts are available, but expensive. James Anderson has mine and is doing a 416 Rigby with extended tangs. Some of the metal work was done by John Farner in NM and some of it by Nick Hughes. Both are very good.

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Nick should have the custom bolt release done in the next week or 2. He surface ground the receiver, did the bolt handle, scope bases, and rings.
John Farner got rid of the ears, built the mag box, installed Duane Wiebe bottom metal and follower. He did the feed work.
James Anderson will do the extended tangs, quarter rib, sling stud, and front sight. He will also do the stock.

Butch