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.308 through a .270 - oh my...
- Thread starter Hossless
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With regard to the questions about knowing by feel, as opposed to checking headstamps - I got very, very lucky last year. Somehow, I had managed to put some loose cartridges of the wrong type in with my range ammo, when I took my Remington 700 out back to check the scope adjustment.
The 700 is in .30-06.
I had not realized how close in dimensions a 7mm Rem Mag is to a .30-06. It's close, in length. It will fit in the magazine of the 700. Luckily, the shoulder won't quite fit into the chamber. I was very confused, at first, as to why my bolt would not close. Then I noticed the bent shoulder, and thought, "huh?" Luckily, the cartridge extracted ok, at which point I checked the headstamp.
I immediately unloaded the magazine, and found two more 7mm rounds.
I still don't know how the three 7mm RM cartridges got mixed in with my .30-06. My guess is, when I unloaded my BAR (which is a 7mm RM), I put the cartridges into the wrong plastic holder insert.
Moral of the story: Check your headstamp, if you have even remotely similar ammo types available.
The 700 is in .30-06.
I had not realized how close in dimensions a 7mm Rem Mag is to a .30-06. It's close, in length. It will fit in the magazine of the 700. Luckily, the shoulder won't quite fit into the chamber. I was very confused, at first, as to why my bolt would not close. Then I noticed the bent shoulder, and thought, "huh?" Luckily, the cartridge extracted ok, at which point I checked the headstamp.
I immediately unloaded the magazine, and found two more 7mm rounds.
I still don't know how the three 7mm RM cartridges got mixed in with my .30-06. My guess is, when I unloaded my BAR (which is a 7mm RM), I put the cartridges into the wrong plastic holder insert.
Moral of the story: Check your headstamp, if you have even remotely similar ammo types available.
Palmetto-Pride
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I know this horse is just about dead, but I once shot a 40SW in a 45ACP. Wow I felt like a jack ass afterwords. But no harm no foul.
I had not realized how close in dimensions a 7mm Rem Mag is to a .30-06. It's close, in length. It will fit in the magazine of the 700. Luckily, the shoulder won't quite fit into the chamber. I was very confused, at first, as to why my bolt would not close. Then I noticed the bent shoulder, and thought, "huh?" Luckily, the cartridge extracted ok, at which point I checked the headstamp.
Wow. That must be almost the absolute pinnacle of ammo mistakes. To slip a belted magnum into the magazine of a 30-06 without noticing it.
I've made plenty of shooting mistakes. This is one that I can never imagine myself making, mostly because I only have a few different cartridges in my inventory.
When you have a .221, a 243, and a handful of 30-06 rifles, it would be a whole lot harder to grab the wrong box and not notice that the cartridge is wrong.
OK, just got off the phone with TC/Smith n Wesson. The customer service rep said to send the rifle in, and if the rifle was damaged beyond repair that they would sell me a new rifle. LOL I'm taking the gun into the gunsmith shortly, and let him diagnose the damage and go from there. I'll give an update - soon, hopefully.
I had no idea a 308 would even chamber in a 270.
While the dimensions of the tapered case body seem to indicate that this would not work, in practice chambers must be large enough for it to work.
I tried a .243 (same as .308 until the shoulder) in all of my .30-06's and it dropped in, even though the .243 case is larger than the .30-06 at that distance above the head.
This doesn't prove that it will always work, of course.
If the question is more about how the .308 bullet fits in a .277 bore, the answer is that the .308 Winchester cartridge is simply much shorter than the .270 Winchester cartridge, so the full diameter doesn't have to fit.
The Lesson to the Rest of Us is to make sure we have the correct ammunition handy when we are ready to fire. Yours Truly has a SIG SHR 970 with bother 7MM Remington Magnum and 300 Winchester Magnum barrels, you can be sure I will triple check my ammunition at the next range session.
I created the 9MM/40 S&W pistol round. Very simple-I fired a 9MM out of a 40S&W barrel in my Browning HP. Bought a used barrel at a gunsmith's, just blithely assumed it was a 9MM barrel. Haha!. Fed OK but accuracy was lousy.
I created the 9MM/40 S&W pistol round. Very simple-I fired a 9MM out of a 40S&W barrel in my Browning HP. Bought a used barrel at a gunsmith's, just blithely assumed it was a 9MM barrel. Haha!. Fed OK but accuracy was lousy.
Extreme Pressure?
An explanation for the apparent lack of pressure signs is the 20% volume in the .270 chamber compared to the .308 Win. The bullet will jump forward and the pressure buildup gets slowed way down because there is a lot less confinement than normal.
That reduced pressure and reduced burn rate may have been enough to allow the .308 bullet to swage down enough to slip through the .277 barrel.
I don't however, plan to prove the possible explanation by trying it myself!
An explanation for the apparent lack of pressure signs is the 20% volume in the .270 chamber compared to the .308 Win. The bullet will jump forward and the pressure buildup gets slowed way down because there is a lot less confinement than normal.
That reduced pressure and reduced burn rate may have been enough to allow the .308 bullet to swage down enough to slip through the .277 barrel.
I don't however, plan to prove the possible explanation by trying it myself!
Therealkoop
New member
Gotta be careful with shotgun shells also.
We were at a skeet shoot and guy chambered a 20 gauge shell in his 12 gauge. The 20 went into his barrel, pulled the trigger. Click. Racked a following 12gauge shell, kaboom.
When I was a kid the old man that lives across the street did just that during skeet. He however, was also missing 2 fingers on his left hand and had a glass eye.
GunXpatriot
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Wow, that's very lucky that you only damaged the barrel.
Quality made rifle? I think so!
It's good that you posted this, it's good to show people what can happen when your not paying full attention. I'm just glad your still able to sit at your computer and type this!
Quality made rifle? I think so!
It's good that you posted this, it's good to show people what can happen when your not paying full attention. I'm just glad your still able to sit at your computer and type this!
briandg, the thing is, when one isn't looking at the belted magnum, but is simply pulling cartridges from a box, one may not notice the belted part.
I got casual about loading, because I couldn't imagine having picked up the wrong cartridges from my last shooting session (or picking up some cartridges but putting them in the wrong tray, more to the point).
I train to do a lot of things by feel, partly as a result of a few years of wrestling followed by many years of aikido; looking at things takes time, response to touch is faster than response to vision, and looking at things that are awkwardly positioned leads to loss of balance.
I have always practiced loading by feel, in case I need to watch a threat (or watch for a threat). This episode taught me that at the very least, I need to look when I put rounds into a container.
I got casual about loading, because I couldn't imagine having picked up the wrong cartridges from my last shooting session (or picking up some cartridges but putting them in the wrong tray, more to the point).
I train to do a lot of things by feel, partly as a result of a few years of wrestling followed by many years of aikido; looking at things takes time, response to touch is faster than response to vision, and looking at things that are awkwardly positioned leads to loss of balance.
I have always practiced loading by feel, in case I need to watch a threat (or watch for a threat). This episode taught me that at the very least, I need to look when I put rounds into a container.
I used to buy 44 mag reloads from a vendor at a local gun show every year. One day at the range I had a miss at 25 yards. Not entirely unknown but unusual for me at that range with that gun. Then I could not eject the shells, had to get a cleaning rod and a wood dowel to beat on the cleaning rod with to get the case out.
I still have it and has a split from rim to mouth. It was a 41 magnum. I checked the box and found another. Checked my other boxes and they were okay but I never bought another reload from anybody. For a long time after that I inspected every box when I got it. Over the last few years I am down to just a cursory check when I open a fresh box, even if it is a box of my reloads.
It happens and can happen to anybody. I'm not bad mouthing that vendor because the reason I was buying from him was because all of his loads had been good and economical and it was easier than punching out my own. I'm sure it was an honest mistake but he won't get another chance from me.
I still have it and has a split from rim to mouth. It was a 41 magnum. I checked the box and found another. Checked my other boxes and they were okay but I never bought another reload from anybody. For a long time after that I inspected every box when I got it. Over the last few years I am down to just a cursory check when I open a fresh box, even if it is a box of my reloads.
It happens and can happen to anybody. I'm not bad mouthing that vendor because the reason I was buying from him was because all of his loads had been good and economical and it was easier than punching out my own. I'm sure it was an honest mistake but he won't get another chance from me.
Well I've heard about this and seen it before and I pray that it won't happen to me, and I'm glad to hear your all right.
My suggestion is that if you still have the rifle at home your going to have to clean all that lead out of the bore, take it to your smith and have him lap the barrel. A friend of mine did this and after a lot of cleaning and lapping it shoots better then before, but such was his case and may not be yours.
My suggestion is that if you still have the rifle at home your going to have to clean all that lead out of the bore, take it to your smith and have him lap the barrel. A friend of mine did this and after a lot of cleaning and lapping it shoots better then before, but such was his case and may not be yours.
Well if worst comes to worst and you don't want to pay for repairs and the damage isn't noticeable like you say You can take it to a pawn shop and see what they'll give you for it. Before you guys rip me for suggesting such a thing remember pawn shops make a living ripping people off.
Well if worst comes to worst and you don't want to pay for repairs and the damage isn't noticeable like you say You can take it to a pawn shop and see what they'll give you for it. Before you guys rip me for suggesting such a thing remember pawn shops make a living ripping people off.
One close to me bought a bunch of sigmas in liquidation. They are marked at 579.99. I mentioned to them that they are 299 at academy and 309 at budsgunshop.com. I was told that these were a new model not available to those stores. LOL
Then a customer asked then difference between 22 el are and 22 mag because he was looking at an NAA revolver with interchangeable barrels. He told the customer that 22mag was bigger around.
I haven't been back since.
Well, the shop may have bad pricing, but .22WMR has a thicker case diameter than .22LR, in addition to the greater length. Neck and base diameter of .242.
In comparison, .22LR has neck and base diameters of .226.
It's not only the length that keeps .22WMR out of .22LR chambers; and the conversion chambers for shooting .22LR out of .22WMR guns are bored tighter, so the .22LR cases don't split.
Difference in bullet diameters is only .224 vs .222, but the cases are in fact different.
So the shop has bad pricing, but they were correct about .22WMR vs .22LR, justin251.
In comparison, .22LR has neck and base diameters of .226.
It's not only the length that keeps .22WMR out of .22LR chambers; and the conversion chambers for shooting .22LR out of .22WMR guns are bored tighter, so the .22LR cases don't split.
Difference in bullet diameters is only .224 vs .222, but the cases are in fact different.
So the shop has bad pricing, but they were correct about .22WMR vs .22LR, justin251.
Gunplummer
New member
You are right. I remember when the Magnum was relatively new on the market and someone brought one in. He picked it up used and could not understand why every case was splitting. He was shooting .22 long rifles's in it. The case is way different. I believe the .17 HMR is nothing but a necked down .22 magnum case.
OK, been reading the replies. I enjoy 'em all, and I don't take offense to anything said. Just got back from the road, grabbed the bore light and looked inside the barrel. Lots of stuff that appears to be shavings? Going to give the barrel, etc a real good cleaning. I can't see any bulging on the outside of the barrel, and the cheap bore light, I don't think would show any bulging - unless it was extreme. I know my shooting around 30 rounds of .270 was DEFINITELY very poor judgement. Like I said, I have never heard or read of anyone doing this - so, ignorance on my part. Anyway, all the comments are taken well and appreciated. TC is closed on weekends, so I'll call them tomorrow. I talked to my gunsmith, and he said to bring it in and he'll check everything out. I just can't help but think I did some damage - couldn't hit paper at close range after the "incident".
I'll keep ya'll posted after the smith takes a look at it.
Good on you!
I have learned there is a lot of good in admitting my foul ups (most of the time, its harder when someone has an agenda to get you) . Others can learn from them, and if I hide them from others I think I am hiding them from myself. Definitely not an easy road to take but its a good one. Mine has come with a lot of soul searching.
Others benefit and that's a big plus, maybe even the most important one.
Good thread, and mostly good stuff and look forward to the end status
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