Tight Squeeze
- Thread starter Gatehouse
- Start date
- Location
- Lower Mainland
Lol
Wish I had save some of those Super Short Neck 7mm RM that had be fired in a 300 Win Mag.
When it appeared they were having trouble getting sighted in it was learned they had the same problem the year before.
Two guys who should have had their CORE and CFSC reviewed.
When it appeared they were having trouble getting sighted in it was learned they had the same problem the year before.
Two guys who should have had their CORE and CFSC reviewed.
In the example given, a .284" bullet was shot through a .277" bore, with no apparent damage.
This was obviously accidental, to use the wrong cartridge, but the shooter had some luck!
Parker Ackley proved that a larger diameter bullet could be shot in a smaller diameter bore, IF THE CASE SEALED THE GAS. In this instance, the 7mm cartridge case was just barely long enough to seal the case to the chamber. That is, had it been a bit shorter, like maybe a 7-08, pressure would have leaked around the end of the cartridge case and blew out every where it shouldn't have. Most likely blowing the stock off.
The reason the larger diameter bullet didn't blow things up is because by the time the bullet had gone the length of itself into the bore, it was sized to .277" diameter and the extra pressure to do this occurred before the cartridge had reached its maximum pressure.
And don't try this at home.
This was obviously accidental, to use the wrong cartridge, but the shooter had some luck!
Parker Ackley proved that a larger diameter bullet could be shot in a smaller diameter bore, IF THE CASE SEALED THE GAS. In this instance, the 7mm cartridge case was just barely long enough to seal the case to the chamber. That is, had it been a bit shorter, like maybe a 7-08, pressure would have leaked around the end of the cartridge case and blew out every where it shouldn't have. Most likely blowing the stock off.
The reason the larger diameter bullet didn't blow things up is because by the time the bullet had gone the length of itself into the bore, it was sized to .277" diameter and the extra pressure to do this occurred before the cartridge had reached its maximum pressure.
And don't try this at home.
What about going in the opposite direction ,,,,,shooting a 7mm (.284) bullet out of a .308 (30 cal.)? On my first shot last week at my back yard range I accidentally chambered and shot one of my 7-08 reloads out my .308. I had grabbed it from the wrong box and because it was full length sized it chambered easily. When the shot didn't even registered on the target I though WTF and then noticed it was the wrong case. Could this cause any damage to the rifling? It didn't appear that it had because my groupings were quite good.
I was actually surprised at how easily it chambered because my sako is pretty fussy in that regard. My 7-08 cases are trimmed to 2.025 whereas my .308 are 2.005.
I was at the range one day, and noted a guy a couple of benches away cursing and screwing his scope up and down.
I walked over to see what was the issue. He said he could not hit the sight-in target 30 yards away.
I looked at the rifle, checked to see if anything seemed loose - all was Ok, then I looked at the ammo....lol
he had shot ¾ of a box of 270 ammo through a 30-06!! No harm done, of course, but he was some embarrassed
when I pointed out the real problem. Dave.
I walked over to see what was the issue. He said he could not hit the sight-in target 30 yards away.
I looked at the rifle, checked to see if anything seemed loose - all was Ok, then I looked at the ammo....lol
he had shot ¾ of a box of 270 ammo through a 30-06!! No harm done, of course, but he was some embarrassed
when I pointed out the real problem. Dave.
BigUglyMan
CGN Ultra frequent flyer
- Location
- New Scotland
I've always wondered with a degree of fear as to what would happen in one of those situations. Apparently the person who fired the shot made it out OK...probably going to be a while before he goes back to the range.
I think he's talking about the 7x57 in the 270, not the 270 in the 30-06!
There are several mixups that can happen that result in no real danger. 7-08 in 308 or 270 in 30-06, as listed above.
I also saw a 7RM in a 7STW. Case was expanded and split at the neck,p but no real harm done.
I really don't know what happened, I found the cases sitting on the bench. The 7x57 was a bit charred, like some gas had escaped around it. But I am at the range pretty much every day and I didn't see any blood splattered around or chunks of rifle embedded in the walls.
I also saw a 7RM in a 7STW. Case was expanded and split at the neck,p but no real harm done.
I really don't know what happened, I found the cases sitting on the bench. The 7x57 was a bit charred, like some gas had escaped around it. But I am at the range pretty much every day and I didn't see any blood splattered around or chunks of rifle embedded in the walls.
duncansuds
CGN frequent flyer
- Location
- Weyburn, SK
My ex father inlaw let a few 22lr go out of a 17hmr. I walked over when unheard something off.... Found it quick, I take some blame there as I had used a few hmr boxes for 22lr because I liked the packaging and didn't think it was ossicle to confuse the two... I was wrong. No damage done at all, but a gentle reminder.
Was at the range this past weekend and a guy had bought a box of 300 savage to shoot in his 300 mag. The guy didn't even realize until he was trying to ram it home. His buddy wasn't much better couldn't get his rifle sighted in at 50m because his scope was mounted 90 degrees the long way. Makes me happy to share the woods with these guys in a few weeks
