5R type rifling ?

[johara1]

Frank, thanks for all the information, it's really nice to see a top end barrel manufacturer come on the forum and offer unbiased information about his products.

When a few people talk about some product being great and another few show information heading in the opposite direction or else where, it's like "catch 22", meaning where in does the truth really belong.
One thing that is unquestionable is the fact that you get more feedback in your position as a manufacturer of barrels then any few people could ever even hope for. I expect you get a few headaches the others don't get also, LOL ;D

Now if we can just get you to explain how to make or barrels "Hummers", that would be 8).

Just order a 100 from Frank and you may get one……….. LOL….. jim

 

[johara1]

I would like to see a 5 groove in conventional rifling, i don't like the rounded lands. i had a couple and when chambered and you look in with a bore scope some lands appear different. Maybe just old eyes………. jim O'Hara

 

[FrankG]

I would like to see a 5 groove in conventional rifling, i don't like the rounded lands. i had a couple and when chambered and you look in with a bore scope some lands appear different. Maybe just old eyes………. jim O'Hara

Jim, The lands are not rounded. They come up a 45 degree angle but not rounded. If your set up is good etc....the throat will cut up and you will have nice even edges on both sides of the lands etc....I've never seen a rounded one.

We've done some conventional 5 groove barrels in some calibers but not all. If we have a tool for what you want it's no extra charge. If we have to make a tool then there could be a charge and cost can vary.

Later, Frank

 

[johara1]

I would like to see a 5 groove in conventional rifling, i don't like the rounded lands. i had a couple and when chambered and you look in with a bore scope some lands appear different. Maybe just old eyes………. jim O'Hara

Jim, The lands are not rounded. They come up a 45 degree angle but not rounded. If your set up is good etc....the throat will cut up and you will have nice even edges on both sides of the lands etc....I've never seen a rounded one.

We've done some conventional 5 groove barrels in some calibers but not all. If we have a tool for what you want it's no extra charge. If we have to make a tool then there could be a charge and cost can vary.

Later, Frank

Frank, Can you tell me what a conventional 5 groove is ? The reason i ask is i just placed an order……….. jim

 

[FrankG]

It's a 5 groove barrel with standard or what some call conventional rifling. This is where the lands basically meet the grooves at a 90 degree corner.

Conventional rifling is called Whitworth or English style rifling as well.

Later, Frank

 

[SG4247]

I use a bore scope to check my rifling condition during the cleaning process.

The 5R rifling is definitely easier to clean than conventional 90 degree rifling. I just did one of Franks barrels yesterday and it was a breeze. This one had 120 rounds since last cleaning, and it was running H4895.

For conventional 90 degree grooves, the sharp 90 degree intersection of the land and groove - there is always carbon build up in that corner, that is hard to remove with my cleaning method (brass jag and cotton patch).

5R barrels do not have that little sharp corner for material to accumulate in. With 5R, the patch can easily contact the full profile of the bore completely.

But, maybe I over clean barrels, as part of my OCD condition....

 

[johara1]

Frank is there a radius in the corner?……… jim

 

[FrankG]

I use a bore scope to check my rifling condition during the cleaning process.

The 5R rifling is definitely easier to clean than conventional 90 degree rifling. I just did one of Franks barrels yesterday and it was a breeze. This one had 120 rounds since last cleaning, and it was running H4895.

For conventional 90 degree grooves, the sharp 90 degree intersection of the land and groove - there is always carbon build up in that corner, that is hard to remove with my cleaning method (brass jag and cotton patch).

5R barrels do not have that little sharp corner for material to accumulate in. With 5R, the patch can easily contact the full profile of the bore completely.

But, maybe I over clean barrels, as part of my OCD condition....

From a carbon fouling stand point I will say the 5R can clean a little easier. From a copper fouling stand point I don't see a difference.

For the most part the way I clean my guns I don't see a ton of difference.

Later, Frank

 

[FrankG]

Frank is there a radius in the corner?……… jim

Jim, Not really. For the most part the land comes down on an angle to the groove. We don't per say put a radius any where on the tool in regards to the sides of the lands etc...

If you look at rifling profiles that are to an industry standard like SAAMI spec. As an example for a 7.62 nato spec. barrel. That is spec'd at a 1-12 twist, 4 groove with a groove width of .167" +.010" for tolerance on the width and they will call out a .002" radius max. down in the corner where the land meets the groove.

Give me a call on the phone. I can probably better answer your questions talking to ya then trying to type it and or understand ya better. I can do it quicker on the phone then by email at times.

Later, Frank