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You'll have to mod a 300WM mag, not difficult to do
Try running a search as this topic has been covered at length in the past, including pictorials and how-to threads. In short, you'll need to adjust the feedlips to correctly run the .30-06 Springfield case body which is a fair bit different than your average LA belted-mag (narrower/smaller than the WM). Brownells (and others) makes a feed lip tool that helps to simplify things somewhat if you are fuzzy on the measurements/dimensions you'll need to adjust the WM mag to run the .30-06 cases correctly.
What do you call the procedure of modifying a .300 magazine, I can't find the instructions.
I didn't even know I had to modify the magazine until I saw this thread. I'm using a 7mm rem mag, but I have not assembled the rifle completely. I thought the mag was good to go, because the brass fitted just fine in the clip.
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I'm running accurate 300 win mags with 6.5-06 Ackley bighorn action so a can add a couple of thoughts here. First is a duck bill vise grip works extremely well to bend the feed lips to work and second I called and talked to a fellow at accurate magazines about this very topic. I saw an ad for Ashberry International offering a 30-06 version chaise system and the magazine in the picture was marked Accurate-Mag, so I called. He said they made some pro-types and they will probably be available in a couple of months
Today I talked to a gunsmith about this, he had no idea about this stuff either.
Dont assume that a Accurate Mag will work as a replacement for an AI product. Some of their mags look identical to the AI product, but are a few thou different. I would certainly call McRee and get their recommendations.
^^^This, the McRee chassis needs 3.715 length, which is standard for AI mags and Accurate DOES make that length but they also make 3.775 length mags which will not fit into an AI magwell
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