BBBBill
Member
Lots of knowledgeable folks trying to help. Ultimately, the answer is a Cerosafe casting. It is not expensive and the answer will be clear once done.
03A3 Caliber Mystery it has been modified.
- Thread starter curtix
- Start date
- Status
jerkface11
Member
Or if you don't have cerosafe you could just try chambering a 300 winmag case.
Chawbaccer
Member
- Joined
- Feb 3, 2005
- Messages
- 1,865
Why can't you look in the chamber for the belt cut out? That would be a big clue right there.
Last edited:
again, I do not pull the trigger on anything with a trigger unless I know the length of the chamber, I have 62 chamber reamers, a few are roughing reamers, a volunteer, volunteered to zero in a friends rifle, after his first attempt with the first shot he shows up at a gun shop, not happy he was still alive, but mad and in the mood for suing the maker of the rifle and or the maker of the ammo etc., he just would not shut up, it took a while but the smith finally ask him what/who furnished the ammo, because the volunteer had his favorite ammo he showed the smith the receipt and said “I did”!
The smith explained to him he had just purchased 308 W ammo for a 25/06, the volunteer did nothing to cause the smith to like him and explained to him he was obligated to test the rifle to determine if the rifle was safe to shoot, and inform the owner if it was not and, the volunteer was not suing anyone.
later, there was a conversation as to how the 308 bullet got down the barrel, with out the receipt it was near impossible to determine by the head stamp what was fired, and that is the reason I ask, “Why did you fire the rifle 3? times if the first case head was flattened, this would not happen if you fired a 30/06 case in a 308 Norma, 300 Win Mag or any other large case body chamber, time is a factor, not understood by reloaders, but it is the reason I am not the big fan of seating bullets to the lands, or near the lands, because I am the big fan of the running start, I want my bullet bullets to have a jump.
I know it sounds cool “I seat my bullets off the lands .002 thousandths and start from there” because time is a factor I do not want my bullets to get to the rifling and then discover things are going to be difficult, things can get serious, if it gets serious while setting still at the lands, with a running start I can be forgiven.
I agree, locate a flash light, determine if the the chamber has a ring for the belt, drop a 280/7mm bullet down the barrel, I purchased a barrel, risk? for $20.00, on the chance it would clean up, I thought the micro groove barrel was worth the risk. $20.00 plus an hour of time, the barrel came out looking new, no chamber stamp, thinking of going with 30/06 Ackley.
F. Guffey
The smith explained to him he had just purchased 308 W ammo for a 25/06, the volunteer did nothing to cause the smith to like him and explained to him he was obligated to test the rifle to determine if the rifle was safe to shoot, and inform the owner if it was not and, the volunteer was not suing anyone.
later, there was a conversation as to how the 308 bullet got down the barrel, with out the receipt it was near impossible to determine by the head stamp what was fired, and that is the reason I ask, “Why did you fire the rifle 3? times if the first case head was flattened, this would not happen if you fired a 30/06 case in a 308 Norma, 300 Win Mag or any other large case body chamber, time is a factor, not understood by reloaders, but it is the reason I am not the big fan of seating bullets to the lands, or near the lands, because I am the big fan of the running start, I want my bullet bullets to have a jump.
I know it sounds cool “I seat my bullets off the lands .002 thousandths and start from there” because time is a factor I do not want my bullets to get to the rifling and then discover things are going to be difficult, things can get serious, if it gets serious while setting still at the lands, with a running start I can be forgiven.
I agree, locate a flash light, determine if the the chamber has a ring for the belt, drop a 280/7mm bullet down the barrel, I purchased a barrel, risk? for $20.00, on the chance it would clean up, I thought the micro groove barrel was worth the risk. $20.00 plus an hour of time, the barrel came out looking new, no chamber stamp, thinking of going with 30/06 Ackley.
F. Guffey
And as mentioned, there is .041 thousandths difference in diameter between the 30/06 and 300 Win mag at the base and it gets (a little) worst when moving out to the shoulder, part of the neck becomes part of the shoulder and part of the shoulder becomes part of the case body, the shoulder of the fired case becomes .048 thousandths larger in diameter, with out splitting? the neck, shoulder, case body, and still, the case head is flattened, then there is case head separation, for that to happen the case body locked onto the chamber and the case head slammed back?????? or did it?
Find someone with tools like micrometers, find someone that understands transfers and standards, if you are my neighbor.
“My Spent shell measures 54 mm to the start of the shoulder, but the win mag should be 55.78 mm. Bit of a different there. But that could be from trying to fire-form”
54mm is = to 2.130 inches, 55.78mm is = to 2.200 inches the neck of the 30/06 .385”= to 9.78 mm, the neck of the 300 Win mag is .264” = to 6.71MM.
Back to the Gibbs, from the head of the case to the juncture of the case body/shoulder is 2.150 thousandths = to 54.61mm and that is .020 thousandths difference between your measurements and Gibbs measurement?? THEN!! there is that jagged edge between the case head and case body that has to be considered.
I am surrounded by friends, master machinist, gunsmiths, reloaders. A gun owner came to a table and and wanted a rifle repaired, he qualified his question with a long list of friends that he had taken the rifle to, a few attempts were made but no improvement, he ask the person on my left, no help and he is too busy, the man on my right said nothing, Finally, I raised my hang, I gave him two options, I told him why he was having to live with his problem, I explained to him how his chamber got that way, and he started to tell me how difficult the problem was going to be to ‘fix?’ because he wanted the configuration to remain the same, seems he installed a long eye relief scope on a Mauser barrel etc., that was chambered to a chamber I do not have for a Mauser, I have no less than 40 Mauser barrels, and, he is still looking for someone to reconfigure his rifle to what it was before he started getting advise of the Internet, and I ask him “How does it shoot?” and he responded with “Good, it shoots good”, and he thanked me for my help.
F. Guffey
Find someone with tools like micrometers, find someone that understands transfers and standards, if you are my neighbor.
“My Spent shell measures 54 mm to the start of the shoulder, but the win mag should be 55.78 mm. Bit of a different there. But that could be from trying to fire-form”
54mm is = to 2.130 inches, 55.78mm is = to 2.200 inches the neck of the 30/06 .385”= to 9.78 mm, the neck of the 300 Win mag is .264” = to 6.71MM.
Back to the Gibbs, from the head of the case to the juncture of the case body/shoulder is 2.150 thousandths = to 54.61mm and that is .020 thousandths difference between your measurements and Gibbs measurement?? THEN!! there is that jagged edge between the case head and case body that has to be considered.
I am surrounded by friends, master machinist, gunsmiths, reloaders. A gun owner came to a table and and wanted a rifle repaired, he qualified his question with a long list of friends that he had taken the rifle to, a few attempts were made but no improvement, he ask the person on my left, no help and he is too busy, the man on my right said nothing, Finally, I raised my hang, I gave him two options, I told him why he was having to live with his problem, I explained to him how his chamber got that way, and he started to tell me how difficult the problem was going to be to ‘fix?’ because he wanted the configuration to remain the same, seems he installed a long eye relief scope on a Mauser barrel etc., that was chambered to a chamber I do not have for a Mauser, I have no less than 40 Mauser barrels, and, he is still looking for someone to reconfigure his rifle to what it was before he started getting advise of the Internet, and I ask him “How does it shoot?” and he responded with “Good, it shoots good”, and he thanked me for my help.
F. Guffey
Thought I would chime in with an update.
I have a gunsmith / machinist who is going to cast it for me next month.
He was busy moving and I am holding out for that since I am in no rush.
----------
Side note - if it is a 30 Gibbs what would (if anything) be a likely cartridge I could change it to, is it worth it, what would you do (I do not reload currently and don't plan on shooting 30 gibbs).
I am hoping is a 30 win mag.
I have a gunsmith / machinist who is going to cast it for me next month.
He was busy moving and I am holding out for that since I am in no rush.
----------
Side note - if it is a 30 Gibbs what would (if anything) be a likely cartridge I could change it to, is it worth it, what would you do (I do not reload currently and don't plan on shooting 30 gibbs).
I am hoping is a 30 win mag.
rcmodel
Member in memoriam
.30 Gibbs:
http://stevespages.com/jpg/cd30gibbs.jpg
300 Win Mg:
http://stevespages.com/jpg/cd300winchestermagnum.jpg
You will need to do the math based on the case/chamber dimensions when you get a chamber cast.
It might be feasable depending on what the chamber cast measures, and if it is in fact a .30 Gibbs.
It would require a bolt-face/extractor alteration to fit the larger case head, and possibly some mag mods to get the belted mag to feed right.
RC
http://stevespages.com/jpg/cd30gibbs.jpg
300 Win Mg:
http://stevespages.com/jpg/cd300winchestermagnum.jpg
You will need to do the math based on the case/chamber dimensions when you get a chamber cast.
It might be feasable depending on what the chamber cast measures, and if it is in fact a .30 Gibbs.
It would require a bolt-face/extractor alteration to fit the larger case head, and possibly some mag mods to get the belted mag to feed right.
RC
- Status
