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<blockquote data-quote="specweldtom" data-source="post: 423048" data-attributes="member: 2580"><p>Shortgrass, I had an older Barnes (#3) reloading manual in the house and looked at it last night to get the rim diameter of the .300 WSM. It shows .473". I thought that was strange, but didn't look any further. After catching up on the thread this morning, I went out to my garage and looked at my Nosler manual and sure enough it shows .535". The .338 Win Mag bolt face will work with the .300 WSM. </p><p></p><p>Winmag, It still looks like feeding out of the magazine will be the biggest issue on the .300 Wby to .338 RUM, but Winchester parts might be available to convert the .338 Win Mag to a .300 WSM. The factory WSM box is probably shorter than the .338 box, but should be able to be fitted and bedded into the longer well. </p><p></p><p>Chad asked 3 key questions.</p><p></p><p>#1. No alteration to the bolt face would be needed for the .338 Win Mag to .300 WSM, and if required at all, altering the .300 Wby bolt face for the .338 RUM would be the slight chamfer on the inside front of the bolt lip, (and maybe touch the corner angle on the face of the sliding extractor).</p><p></p><p>#2 is the biggie. I don't know the answer to that one unless you're willing to single load.</p><p></p><p>#3. The .300 Wby ejection port should easily clear a .338 RUM fired case. The .338 Win Mag ejection port might be long enough to clear an unfired .300 WSM, so a fired case would have all kinds of room.</p><p></p><p>Never having done these conversions limits me to just reasoning my way through the process (pretty scary since I often miss something important), but with the other replies, maybe we've given you enough to go on. </p><p></p><p>Let us know what you decide to do. Tom</p></blockquote><p></p>
[QUOTE="specweldtom, post: 423048, member: 2580"] Shortgrass, I had an older Barnes (#3) reloading manual in the house and looked at it last night to get the rim diameter of the .300 WSM. It shows .473". I thought that was strange, but didn't look any further. After catching up on the thread this morning, I went out to my garage and looked at my Nosler manual and sure enough it shows .535". The .338 Win Mag bolt face will work with the .300 WSM. Winmag, It still looks like feeding out of the magazine will be the biggest issue on the .300 Wby to .338 RUM, but Winchester parts might be available to convert the .338 Win Mag to a .300 WSM. The factory WSM box is probably shorter than the .338 box, but should be able to be fitted and bedded into the longer well. Chad asked 3 key questions. #1. No alteration to the bolt face would be needed for the .338 Win Mag to .300 WSM, and if required at all, altering the .300 Wby bolt face for the .338 RUM would be the slight chamfer on the inside front of the bolt lip, (and maybe touch the corner angle on the face of the sliding extractor). #2 is the biggie. I don't know the answer to that one unless you're willing to single load. #3. The .300 Wby ejection port should easily clear a .338 RUM fired case. The .338 Win Mag ejection port might be long enough to clear an unfired .300 WSM, so a fired case would have all kinds of room. Never having done these conversions limits me to just reasoning my way through the process (pretty scary since I often miss something important), but with the other replies, maybe we've given you enough to go on. Let us know what you decide to do. Tom [/QUOTE]
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