5R rifling in F class?

Popular: "frequently encountered or widely accepted". Yes 5R is popular - just checked and the top 3 FTR shooters at the last national used 5R and I think most of the others and many open class as well. Krieger and Bartlein do not claim superior accuracy, but most claim that they clean easier and they are used more in larger calibres. 5R and 6 groove are the main choice in .338 and Krieger only use 5R and 6 groove in .338.

Just confirmed from another top FTR shooter, so at least 4 of the top ten FTR shooters use 5R. I think the number is higher but not confirmed.
 
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1340 said:
Newbie question.
How popular is 5R rifling in F class open?
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Pick an F Class barrel on the basis of what projectile project you want to use... that is... pick a barrel based on the twist rate.

The next factor is the contour and length... go as thick as possible while trying to find a barrel that is in the 30 inch range.
Your constraint at this point, is how close your are to hitting the weight limit for your class.

The number of grooves in what ever barrel you end up selecting is kind of inconsequential.
 
I have a bullet picked,
I know the twist I want,
I know the contour and length I want.
I will need to calculate weight.
The only other thing I need to consider is rifling.
I need to decide on regular rifling or take a chance on 5R rifling.
 
1340 said:
OK.
Sounds like a riddle.
LOL.
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5R, R4G, 3, 4, 5, 6, canted, polygonal, etc ... rifling is not going to determine the accuracy of the barrel. there are some very experienced F class shooters answering your question and we have tried them all. If it really mattered, there would be a dominant spec used.

there isn't. More importantly is the quality of barrel and how well it is manufactured.

If I can help with the barrel, let me know

Jerry
 
1340 said:
I have a bullet picked,
I know the twist I want,
I know the contour and length I want.
I will need to calculate weight.
The only other thing I need to consider is rifling.
I need to decide on regular rifling or take a chance on 5R rifling.
Click to expand...

If you want to share your choices, maybe you can confirm if it will work or not.

Jerry
 
1340 said:
I have a bullet picked,
I know the twist I want,
I know the contour and length I want.
I will need to calculate weight.
The only other thing I need to consider is rifling.
I need to decide on regular rifling or take a chance on 5R rifling.
Click to expand...

5R is a personal choice - there is no dominant trend. I personally use 5R with the belief that (a) it's easier to clean and (b) it's less likely to drop off the cliff in accuracy - being more moderate and dropping off incrementally from wear with the 5R land. I recall that Litz also addressed this issue in his book, regarding bullet deformation. [Applied Ballistics for Long-Range Shooting]
 
1340 said:
I have a bullet picked,
I know the twist I want,
I know the contour and length I want.
I will need to calculate weight.
The only other thing I need to consider is rifling.
I need to decide on regular rifling or take a chance on 5R rifling.
Click to expand...

You would be wiser to spend more time researching who be a good, competent gunsmith to thread and chamber your new, expensive, high quality barrel properly for peak performance.

A $600 to $900 barrel won't rip up the V Bull if it was installed by a hack.

IMO, Good gunsmiths I've had very positive dealings with are Dennis Lair (Go Ballistic Gunsmithing), Joe P. ( R#S Inter-national) ... Terry at Black Art Rifle (but I am not entirely sure he is still around).
 
Chamber reamer and throat dimension selection (freebore), would be just as important as a gunsmith. Twist rate is important to stabilize your bullet, if you haven't done a twist rate stabilization calculation ensure your bullet has a Stability Factor of over 1.5 SG. Most F-class competitors have their own reamers cut to the dimension suited to their bullet selection. Rifling is a matter of preference I've shot them all. Personally I prefer a 4 or a 6 groove depending on the weight of the bullet. I've have good success with all of them.
 
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The folks at Krieger started producing 5R for only one reason: people wanted it. John Krieger and the "father" of 5R rifling , Boots Obermeyer were the best of friends and the Krieger staff tested them Ad Nauseum. There were no measurable differences in accuracy, consistency, cleaning, barrel life or bullet velocity over standard rifling. If you really want to stack the deck in your favour, look at what shooters with a winning pedigree use, and get an expert to put it together.
 
Speaking of this topic, do we think there's a chance that Cortina is going to be manufacturing barrels from bar stock, given his new machine shop upgrade?
 
I could see Eric adding a surpressor line with built in tuners. Didnt see him bring in any rifling machines, but with how fast he is expanding who knows.
 
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