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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What happens when you use a 270 win in a 30-06
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<blockquote data-quote="Kevin Thomas" data-source="post: 707916" data-attributes="member: 15748"><p>The question here really depends on the cartridges involved, but as has already been mentioned, chambering a 270 round in a 30-06 chamber and pulling the trigger shouldn't do anything but form a normal 30-06, which is what you'll have when you extract that case. </p><p> </p><p>It's called fireforming, and is a standard practice in a great many calibers. Many years ago I had a friend who routinely shot 300 H&H rounds in his 300 Wby Mag, simply because they were more readily availble in that area at the time, and substantially less expensive. The rounds went in as H&H, and were 300 Wby when extracted. After that, they were loaded normally as 300 Wby. </p><p> </p><p>Along those same lines, I used to shoot a 7mm TCU for silhouette pistol competition. Case loss was very bad when using military brass (which Thompson recommended against, but I had tons of it at the time; it was GOING to get used), usually due to necks splitting. This was while trying to open the necks up with an expander mandral, the normal method of necking a case up to a larger diameter. Annealing helped at great deal, but I also found that simply firing 223 or 5.56mm ammo in the 7mm TCU chamber resulted in perfectly formed cases with virtually zero case loss or neck splitting. That became my normal method of making 6mm, 6.5mm and 7mm TCU cases from that point forward.</p><p> </p><p>Not that big a deal in many instances, and can be a required step in forming some wildcats. </p><p> </p><p>There's a flip side, too. In some situations, it's possible to chamber and fire a case with a larger bullet diameter than the bore diameter of the intended cartridge. The 308 in a 30-06 has been mentioned, but loaded rounds of a 338 Federal or a 358 Win will also chamber in a 30-06; or a 270 or probaly a 25-06 for that matter. These, as you can imagine, would be an entirely different situation. Worst case I've ever actually seen involved a guy who fired a round of 300 Whisper (or 300 Blackout) in a 5.56mm upper by mistake. Same magazines, same type of upper, etc., which is definately something to remember for those of us who own both chamberings, and have both rounds on hand. Amazingly (to me, anyway) the gun held, and literally swagged that .308" diameter bullet down a .224" barrel and completely out the muzzle. I'm also aware of an instance in which a kitchen table gun plumber rechambered a 6.5 Jap Arisaka to 30-06, as he couldn't find a supply of Arisaka ammo. No mean feat here, as he had to grind off the pilot to do this, but he got it rechambered to accept 30-06 ammo. Now, please note that I said "rechambered", not "rebarreled." The original Japanese .263" barrel was left in place. He actually managed to kill a deer or two before taking it to a real gunsmith to find out why it kicked so much harder than any other 30-06 he'd ever fired. That gun is occasionally on display at the NRA museum. The Arisakas may not be the most stramlined actions ever produced, but they were one of the strongest.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 707916, member: 15748"] The question here really depends on the cartridges involved, but as has already been mentioned, chambering a 270 round in a 30-06 chamber and pulling the trigger shouldn't do anything but form a normal 30-06, which is what you'll have when you extract that case. It's called fireforming, and is a standard practice in a great many calibers. Many years ago I had a friend who routinely shot 300 H&H rounds in his 300 Wby Mag, simply because they were more readily availble in that area at the time, and substantially less expensive. The rounds went in as H&H, and were 300 Wby when extracted. After that, they were loaded normally as 300 Wby. Along those same lines, I used to shoot a 7mm TCU for silhouette pistol competition. Case loss was very bad when using military brass (which Thompson recommended against, but I had tons of it at the time; it was GOING to get used), usually due to necks splitting. This was while trying to open the necks up with an expander mandral, the normal method of necking a case up to a larger diameter. Annealing helped at great deal, but I also found that simply firing 223 or 5.56mm ammo in the 7mm TCU chamber resulted in perfectly formed cases with virtually zero case loss or neck splitting. That became my normal method of making 6mm, 6.5mm and 7mm TCU cases from that point forward. Not that big a deal in many instances, and can be a required step in forming some wildcats. There's a flip side, too. In some situations, it's possible to chamber and fire a case with a larger bullet diameter than the bore diameter of the intended cartridge. The 308 in a 30-06 has been mentioned, but loaded rounds of a 338 Federal or a 358 Win will also chamber in a 30-06; or a 270 or probaly a 25-06 for that matter. These, as you can imagine, would be an entirely different situation. Worst case I've ever actually seen involved a guy who fired a round of 300 Whisper (or 300 Blackout) in a 5.56mm upper by mistake. Same magazines, same type of upper, etc., which is definately something to remember for those of us who own both chamberings, and have both rounds on hand. Amazingly (to me, anyway) the gun held, and literally swagged that .308" diameter bullet down a .224" barrel and completely out the muzzle. I'm also aware of an instance in which a kitchen table gun plumber rechambered a 6.5 Jap Arisaka to 30-06, as he couldn't find a supply of Arisaka ammo. No mean feat here, as he had to grind off the pilot to do this, but he got it rechambered to accept 30-06 ammo. Now, please note that I said "rechambered", not "rebarreled." The original Japanese .263" barrel was left in place. He actually managed to kill a deer or two before taking it to a real gunsmith to find out why it kicked so much harder than any other 30-06 he'd ever fired. That gun is occasionally on display at the NRA museum. The Arisakas may not be the most stramlined actions ever produced, but they were one of the strongest. [/QUOTE]
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