What caliber is it?

[reuben_j_cogburn]

I am taking a Remington XP100, back to my cabin. It belongs to a friend who traded it for a gun of lesser value.
It has a S/S barrel and muzzle break...
The weird thing is, there is no markings on the barrel. So I will remove the stock to see if it was stamped there.
It will be interesting.
The rim diameter appears to be of a 30 caliber case... just eyeballing it of course. But the muzzle diameter still appears to be a .22 caliber.
I'm not sure how many calibers these guns where chambered in but finding out should be fun!!!
I'll take pics and post them on my next freight run... which is on the 28th....
This is my kinda mystery...
Well.... I gotta run!!! At least the temps are good and the sun is out.. I'll make good time on the river!

 

[arfmel]

Probably gonna need some cerrosafe to make a chamber cast. It sounds like a custom barrel.

 

[coach]

From Wikipedia. Of course .221 fireball is what I think of when I hear XP-100
Caliber production by year
• .221 Remington Fireball (1963–1985)
• 7 mm BR Remington (1980–1985)
• .223 Remington (1986–1997), (2005–Present in XR-100)
• .35 Remington (1986–1997)
• 350 Rem. Mag (1991-1997)
• .250 Savage (1990–1992) Custom Shop only
• 6 mm BR Remington (1990–1992) Custom Shop only
• .22-250 Remington (1992–1994) Custom Shop only, (2005–Present in XR-100)
• .308 Winchester (1992–1994) Custom Shop only
• 7 mm-08 Remington (1993–1994)
• .204 Ruger (2005–Present in XR-100)

 

[rugerjunkie]

Probably gonna need some cerrosafe to make a chamber cast. It sounds like a custom barrel.

^^^ what he said. And coach gave a pretty good list of what is commonly known calibers made. But with Remington , all you needed was money and they'd make anything you wanted in the custom shop!

Obviously with the stainless barrel and lack of markings it isnt factory. A popular rebarrel with them is the 22BR. It'll be interesting to find out what you actually end up with there.

 

[gramps]

Yes, very interesting. I am impressed with how quickly coach came up with that array of calibers, and dates produced! Good job!
gramps

 

[Dan in MI]

XP's were rebarrelled by the 1000's for silhouette shooting. You will need to do a chamber cast.

 

[rugerjunkie]

Yes, very interesting. I am impressed with how quickly coach came up with that array of calibers, and dates produced! Good job!
gramps

Blue book of gun values has the info. One of these days I'll get around to buying a couple more xp's to make it a dozen for a nice clock picture! I currently have several 221's , a custom shop 7mm-08 , 7mmBR's , and a 35 Rem. They can be addicting just like anything else!

 

[Merle1948]

Probably gonna need some cerrosafe to make a chamber cast. It sounds like a custom barrel.

yeah, that barrel sure sounds like a replacement.
does the previous owner happen to know?

 

[mhblaw]

...and I had one in 7mm IHMSA.

 

[mohavesam]

the only safe manner of verifying the chamber/caliber is to do a chamber cast. I'd do two, they are cheap and I might need a second opinion!

Find out whose barrel it is (maker) and write that maker a nice letter stating how incredibly dangerous it was to not engrave/stamp the chambering of their barrel. And let us all here know the maker, please?

meanwhile, you have an excellent gun. Its not very expensive to have an extra remington barrel made/mounted and I recommend a 250 Savage...

 

[RSIno1]

The rim diameter appears to be of a 30 caliber case... just eyeballing it of course. But the muzzle diameter still appears to be a .22 caliber.

Fits the 221 Fireball to a tee. 30 Carbine and 221 Fireball use the same shell holder. But if there are no markings it'll take a cast to find out.

https://en.wikipedia.org/wiki/.221_Remington_Fireball

 

[Merle1948]

the only safe manner of verifying the chamber/caliber is to do a chamber cast. I'd do two, they are cheap and I might need a second opinion!

Find out whose barrel it is (maker) and write that maker a nice letter stating how incredibly dangerous it was to not engrave/stamp the chambering of their barrel. And let us all here know the maker, please?

meanwhile, you have an excellent gun. Its not very expensive to have an extra remington barrel made/mounted and I recommend a 250 Savage...

keep in mind many barrels were sold unchambered - and it was up to the gunsmith to stamp them

 

[reuben_j_cogburn]

Well..... Boy was I wrong!!!!!
I got the XP up to my homestead, and once I got it into better light.. (my buddy's place is rather dim)... I immediately knew it wasn't a .22 caliber... but it wasn't .30 either...
I dug out my calipers, removed the muzzle break and mic'd it... It came out as 7mm.....
Well.... I was on y way... I measured the bolt face and it came out to equal the 7mm BR.....
I needed to measure the chamber, but casting it was not an option at this point.... So I cheated...
All I wanted was to point me in a direction.... Well.... I made up a crude depth gauge using an old saw file and a zip tie..... I could see into the chamber fairly well, so I inserted the file into the chamber until it touched the shoulder. I then adjusted the zip tie to approximate the bolt face location....
It is definitely to long to be a 7MM BR... it comes out very close to 7MM IHMSA..... which would simplify the reloading process greatly...
However it will have to wait for break up, and the coming summer season..
But... it was interesting and I am looking forward to exploring it further. I just returned it to my pal's house....

 

[Merle1948]

Well..... Boy was I wrong!!!!!
I got the XP up to my homestead, and once I got it into better light.. (my buddy's place is rather dim)... I immediately knew it wasn't a .22 caliber... but it wasn't .30 either...
I dug out my calipers, removed the muzzle break and mic'd it... It came out as 7mm.....
Well.... I was on y way... I measured the bolt face and it came out to equal the 7mm BR.....
I needed to measure the chamber, but casting it was not an option at this point.... So I cheated...
All I wanted was to point me in a direction.... Well.... I made up a crude depth gauge using an old saw file and a zip tie..... I could see into the chamber fairly well, so I inserted the file into the chamber until it touched the shoulder. I then adjusted the zip tie to approximate the bolt face location....
It is definitely to long to be a 7MM BR... it comes out very close to 7MM IHMSA..... which would simplify the reloading process greatly...
However it will have to wait for break up, and the coming summer season..
But... it was interesting and I am looking forward to exploring it further. I just returned it to my pal's house....

don't forget there were a number of wildcats similar to 7mm IHMSA, so a chamber cast is really needed.....

 

[mohavesam]

I'm glad there is some followup posted, thanks rueben.
Really glad the followup isn't from the ER.

 

[gemihur]

7-30 Waters?

 

[Dan in MI]

You can do a quickie chamber cast with wax. Works just fine.

As I stated above 1000's were rechambered for silhouette, and there are at least 20 cals with a .308 head and 7mm bore that were used. 7mm IHMSA is one of the most common.