Ever heard that certain calibers want a certain NUMBER of rifling grooves?

[EXPRESS]

This came up with more than one gunsmith here.

Personally I think it comes down to the "cultural" characteristic of people here, they seem to like to come up with the most complex, unthinkable explanations as to why they do something differently.

The case in question began when shopping around for a smith to rechamber a barrel from 7mm-08 to 7SAUM.

It was said that the 7SAUM in particular, requires a definite number of grooves and that since that barrel was chambered in 7-08 it was unlikely to be suitable for the 7SAUM. I'll point out that twist rate was never mentioned.

Just for the record the barrel is a Krieger, with 400 rounds through it.

To me, this is rubbish. Tests with various barrels may show that more or less grooves in a particular chambering might shoot more accurately or faster, but we might also see those same differences between identical barrels.

So I'm just fishing for similar experience, I've called búllßhït, also because no barrel manufacturer has ever offered similiar propositions....

 

[toddc]

I can see someone saying that a certain groove could cause bullets to tear up more but its not like a SAUM is a horsepower beast like a RUM. Sounds like internet garble to me. I have heard a lot of technobabble about grooves and lands and such.....Luckily I am tooooo stoooopid to understand any of that so I buy whatever barrel is in stock and screw it on a Savage and go shoot bugholes even with stupidly overbore and long for bearing surface rigs.
KISS

 

[gusd]

I stopped by Bartlein's shop and had a talk about that very thing. The short version of our long conversation is they will build you whatever you want . More grooves less grooves they even do a gain twist.
As per their recommendation I went with a 5R on all 3 customs they built for me.

 

[Schnyd112]

I have read it is caliber specific, the larger calibers don't need as many lands. I do not shoot any of the big boomers so really don't even know if that is standard or not. All I know is my fiancées dad has an old Springfield 30-06 and it is a 2 groove barrel. The replacement barrel he has for it is a 3 groove. I can't imagine a barrel suitable for a 7-08 being no good for a saum unless it was a twist issue.

 

[ohiohunter]

The best explanation I've come across is even vs odd number of lands. Even number puts 2 lands directly across one another causing more deformation of the bullet where as odd lands are pushing across from a groove. This was the rational when Obermeyer came up w/ the 5r cut.

 

[sable tireur]

All I know is my fiancées dad has an old Springfield 30-06 and it is a 2 groove barrel.

Those 2-groove barrels were for expeditiousness during wartime. We needed tens of thousands of these rifles pronto so the option was to take less time to cut the number of grooves. The upside is that many of these 2-groove rifles were superbly accurate.

You will find every reaction to the question about the number of grooves following who is winning with what barrel maker and how many grooves they use to make those barrels. We have seen this with Lilja 3-groove, Kreiger 4-groove and most recently, Bartlein 5R. Talk to your gunsmith to listen to his choices then make a decision for yourself and what you want to work with. We are truly blessed to have so many top quality barrel makers today that it makes no sense to make a statement that one is superior to all the rest.

Regards.

 

[Canadian Bushman]

This came up with more than one gunsmith here.

Personally I think it comes down to the "cultural" characteristic of people here, they seem to like to come up with the most complex, unthinkable explanations as to why they do something differently.

The case in question began when shopping around for a smith to rechamber a barrel from 7mm-08 to 7SAUM.

It was said that the 7SAUM in particular, requires a definite number of grooves and that since that barrel was chambered in 7-08 it was unlikely to be suitable for the 7SAUM. I'll point out that twist rate was never mentioned.

Just for the record the barrel is a Krieger, with 400 rounds through it.

To me, this is rubbish. Tests with various barrels may show that more or less grooves in a particular chambering might shoot more accurately or faster, but we might also see those same differences between identical barrels.

So I'm just fishing for similar experience, I've called búllßhït, also because no barrel manufacturer has ever offered similiar propositions....

I think you are coming to logical conclusions.