6mm OBT
- Thread starter viper
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bulldog284
CGN Regular
- Location
- pigeon hill
does anyone have any load info and how to form brass?is any one still using this case?
Pretty hard to say just knowing the caliber. I would say it has more appeal as a bit of history than being practical. If you don't mind case forming and like oddball cartridges it would be fun. Does it come with dies, is it still in a Hunter Benchrest stock?
BTW Nobby is still making the occasional rifle, you might want to talk to him about it. JoeM above will have the number.
It would be close to the one of the 6BR derivatives with a case capacity similar to a 30-30 (those are the hunter bench limits for case capacity).
There are much better alternatives for cartridges today so there is little need to go the route of a 6-OBT. BTW I think OBT was/is "Old Boy's Toy".
Shoot it as is, then re-barrel to a 6BR?
The case I have is about 1.800 " long with a neck about .240" long. the case has very little body taper and it looks like a 40 or 45 degree shoulder. neck dia is .262 .so neck turning is mandatory if new brass is made up for it.
I think to form cases you just turn the neck ,trim the casesto length and fireform. this case I have would have been shot with a rifle cut with the same reamer that your gun have.
And a Reminton 78 is just a lower cost 700, it came with a cheaper stock and finish on the metal, so is just as good as any Rem 700
I think to form cases you just turn the neck ,trim the casesto length and fireform. this case I have would have been shot with a rifle cut with the same reamer that your gun have.
And a Reminton 78 is just a lower cost 700, it came with a cheaper stock and finish on the metal, so is just as good as any Rem 700
bulldog284
CGN Regular
- Location
- pigeon hill
i now a gentelmen who has one in a 7mm obt in a 40 xb shoots very well he lives in quebec but it was made someweres out west.
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
Sounds alot like a 6mm 6.5X47L improved would look today.
There is lots of interest in these 6mm-22/250 variants these days. However, except for brass construction very little is new. This same interest came through in the late 70's and 80's.
But today we have such wonderful bullets as the 115gr Bergers and DTAC's causing a resurgence of interest in these wildcats again. Just remember that the barrel twist will likely be slow as light bullets were the rage in the 'old days'. That will likely not stabilize any of the popular heavy slugs.
Case is a bit large for the 68 to 80gr class of bullets. But the speed would be kind of fun.
Enjoy...
Jerry
Jerry these OBT's chambered rifles were purpose built Hunter Class Benchrest and Varmint Hunter Class Benchrest rifles conforming to strict rules. Case capacity is predicated by the rules, min 30/30 case capacity, case length is 1.75" min, Hunter class is .25 caliber and over, Varmint Hunter is .224 caliber and over. It is shot at 100/200/300 yds and uses a score target. Twist has nothing to do with "rage" or "old days" it has everything to do with bullets that stabilize quickly and minimize recoil, while having high velocity, all in the context of Hunter Benchrest rifles. Light bullets and very slow twists still dominate Hunter Bench and Varmint Hunter classes, even in the 30 cal's they are mostly shooting 112-118 gr bullets, and 17"-18" twists. This rifle is by no means obsolete, it just may not be what the OP has in mind, unless he wants to take a run at Hunter Benchrest.
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Joe,
Was the parent case not 300 Savage? I thought it was essentially the 300 Savge with the shoulder pushed back and sharpened up. Not being a big wildcat fan myself, I didn't pay that much attention. I know there are still some Okanogan hunter class shooters who have them.
Jerry,
If you necked the 6.5x47 Lapua up to 30 caliber, it wouldn't be too much different from the OBT except for the small primer. As I recall, Nobby also made some cases up using Remington BR basic brass to utilize the small primer but didn't see any benefit. He also made up 6BR brass with a large primer pocket and found any difference difficult to demonstrate.
For those who don't know, when Remington first brought out the BR cartridge (when many of you were babies or, in some cases, potential babies!), the 22 BR was brought out first. Formed brass was not available. Instead, Remington furnished 308 brass with a small primer pocket. This brass was made from a 300 Savage cup so the finished product would be thinner. It was still plenty thick and the forming of BR brass was truly a PITA. Cindy Six (Lee's daughter) used to make up BR brass and sell it for 50 cents apiece which was a bargain IMO. Even in 1978. Had Remington sold formed brass at the time, the PPC might not have dominated the BR scene so completely today. The PPC probably shoots slightly better but the BR ain't that bad. I know Nobby Uno shot his very well and was always a threat to those of us who were PPC users. Regards, Bill.
Was the parent case not 300 Savage? I thought it was essentially the 300 Savge with the shoulder pushed back and sharpened up. Not being a big wildcat fan myself, I didn't pay that much attention. I know there are still some Okanogan hunter class shooters who have them.
Jerry,
If you necked the 6.5x47 Lapua up to 30 caliber, it wouldn't be too much different from the OBT except for the small primer. As I recall, Nobby also made some cases up using Remington BR basic brass to utilize the small primer but didn't see any benefit. He also made up 6BR brass with a large primer pocket and found any difference difficult to demonstrate.
For those who don't know, when Remington first brought out the BR cartridge (when many of you were babies or, in some cases, potential babies!), the 22 BR was brought out first. Formed brass was not available. Instead, Remington furnished 308 brass with a small primer pocket. This brass was made from a 300 Savage cup so the finished product would be thinner. It was still plenty thick and the forming of BR brass was truly a PITA. Cindy Six (Lee's daughter) used to make up BR brass and sell it for 50 cents apiece which was a bargain IMO. Even in 1978. Had Remington sold formed brass at the time, the PPC might not have dominated the BR scene so completely today. The PPC probably shoots slightly better but the BR ain't that bad. I know Nobby Uno shot his very well and was always a threat to those of us who were PPC users. Regards, Bill.
Bill I went and looked at the headstamp of some of the cases I have ,I've got 1 from a 250 Savage, 1 from a 243 winchester case and another made from a Remington BR basic case. So it looks like he made them from a variety of cases looking for the perfect case to form from.
If it was done now I think using Lapua brass would be the answer when they release the new 22-250 brass and the small primer pocket 308 case.
Joe
If it was done now I think using Lapua brass would be the answer when they release the new 22-250 brass and the small primer pocket 308 case.
Joe
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
rpollock, unfortunately, there is zipo of this type of shooting, that I am aware of, in BC. The Penticton club used to have a fairly strong following but that has faded away many years ago.
If there are events in the area, be great to hear about them.
Around here, F class is the new score game and that has grown very nicely due in large part to the support of the Kamloops, Mission, and Chilliwack clubs.
But I am sure you know all of that already.
So a rifle like is being described may be competitive but for a competition that isn't around anymore. there is little doubt it would be accurate as Noby has built some superbly shooting rifles.
If the rifle was purchased to compete, and F class was what he wanted to compete in, the set up would not be current. Fast low BC bullets don't work so good in this game.
I am sure you know all about the new 6XC's, 6-6.5X47L, etc, etc and the fast twist high BC VLD's being shot. So yes, there is a resurgence in these wildcats from years past but their application has changed.
Although they are now promoted as 'new', they are all far from it.
A huge amount of knowledge came from the BR days of the 70's and 80's. Sometimes I get a good chuckle when I hear of some new fangled cartridge that is now 30yrs old.
Jerry
If there are events in the area, be great to hear about them.
Around here, F class is the new score game and that has grown very nicely due in large part to the support of the Kamloops, Mission, and Chilliwack clubs.
But I am sure you know all of that already.
So a rifle like is being described may be competitive but for a competition that isn't around anymore. there is little doubt it would be accurate as Noby has built some superbly shooting rifles.
If the rifle was purchased to compete, and F class was what he wanted to compete in, the set up would not be current. Fast low BC bullets don't work so good in this game.
I am sure you know all about the new 6XC's, 6-6.5X47L, etc, etc and the fast twist high BC VLD's being shot. So yes, there is a resurgence in these wildcats from years past but their application has changed.
Although they are now promoted as 'new', they are all far from it.
A huge amount of knowledge came from the BR days of the 70's and 80's. Sometimes I get a good chuckle when I hear of some new fangled cartridge that is now 30yrs old.
Jerry
