Here I am. Yes, McCann is one of my clients and I spent a lot of time in their booth at SHOT Show. They have sharp knives and big guns. Website:
http://www.mccannindustries.com The .338 conversion is on the web site. The .458 was completed only a month ago and is not yet on the site.
The .458 Win Mag Garand holds 5 rounds - gas operated. Hornady makes cartridge for it with a 510 gr bullet. Five rounds have a combined force of over 31,000 ft-lbs of energy delivered.
What they offer is a conversion of your M1 Garand. They don't want your collectable piece, they want your beat up junker. They keep (and refinish) the receiver and bolt and trigger group. The rest is replaced. Yes, the OP rod is shortened and straight. They make a full length version and a shorter version (kind of like a Tanker Garand) for those who want quick bear control as soon as they exit the truck or bush plane.
The base price is $2,500 (plus your Garand). There are several upgrades available (scope mount, etc.).
Ronnie Barrett came by the booth. He liked it.
His comment: "Very, very nice."
Ted Nugent came to the booth specifically to see this gun.
I'll post pictures of him holding it and grinning big when I can. His comment: "I'm going to Africa this year and I want one of these to take and use. I'll be in touch to order one."
Richard McCann put 340 rounds through it in one week without a sore shoulder. I didn't get to shoot it because tear down of the booth took too long on Sunday.
PS MOST African countries do NOT allow the importation of semi-autos for hunting.
But many do. As I understand it, at least Zimbabwe and maybe Botswana do.
A group buy very is possible. In fact, one guy committed to "at least 6 and maybe 8" at the show with a special negotiated price. Remember that part of the price is a customer-supplied Garand, though it can be a junker. The receivers were originally over-engineered, so they last and can handle the .458 loads without a problem. If at least 5 are interested, I bet I can get a THR price.
Tamara endorses the McCann Puffin Magnam fixed blade utility knife.
Correia cut himself real good on my McCann Foldair folding knife.
I showed it to another customer later in the day who said, "Is this blood on the blade?" Oops, yes, I guess so.