5R twist,

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Ferdelance

Bearcat
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I have the Ruger LR 243, 26'' trying to reload 85 grn Hornady V MAX. The twist is 5R, what or how would you reload for this?
 
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'5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves.'
Rather than having the lands cut @ 90* to the grooves, the 'R' lands are cut 'less square' giving a 'softer' edge to the lands. Purported to cause less drag, increase velocities, and/or cause less disfiguring of the bullet's surface. The number of lands/grooves is often (always?) an uneven number. Mine (all from AR Performance)are either 3 or 5.
I have a few of the 'R' rifled barrels-7.62x39 AR 10.5" 5R (very accurate for what it is), 6.8 SPC AR 16" 5R (I don't even know how accurate it might be with suitable ammo), and a 6.8 SPC AR 10.5" 3R (accuracy potential can't be utilized in this platform-more accurate than optic/shooter can exploit).
These are all hunting guns but I'm going to offer that the 'R' rifling works quite well. For reloading suggestion, I'd just proceed as with any other barrel. You MIGHT be able to exceed loading data for conventionally rifled barrels but that's entirely on YOU(not a recommendation).
 

beentheredone

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5R is the style of rifling, not the twist rate. A 5R barrel can be any twist you make it, if you are making it.
 
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Rifling cut is more than just twist rate. Different bullets react to different cuts. If Wal Mart accurate is good for you then fine. In my Silhouette gun I run a Douglas Barrel for heavy (330) cast bullets. It has a cut that looks like Marlin Micro Groove. I have a Pac Nor barrel that has put 300gr fmj into 3/4" @ 200yds. If you actually care about accuracy beyond Winchester White Box you find the ammo your gun likes as is or you build the gun to your ammo.
 
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I have the Ruger LR 243, 26'' trying to reload 85 grn Hornady V MAX. The twist is 5R, what or how would you reload for this?
How do you know that 85gr V Max will respond well in that barrel? How I would load for it would be to load 3-5 shoot over a chronograph for group and keep increasing until accuracy deteriorates or max loads are approaching. I usually start with 3-5 different bullets and powders. Some will weed themselves out in short order. Trying to force a gun to shoot a bullet not suited to it is a waste of time. A good place to start is with established data. Most reviews will include an accuracy chart with various weights and types of ammo start there. Once you know what weight and bullet configuration it likes then you can start at minimum and work your way towards maximum to find the sweet spot. A lot of the newer guns are being tailored for ELD bullets which is fine but not necessarily what you are wanting to do.
 
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beentheredone

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Send me your rifle plus bullets, brass, powder and primers. In a few weeks, I will give you a report, and maybe return the rifle. But the thing is -- your rifle is not my rifle, so how I'd load my rifle is irrelevant in your case. You just have to try it out...
 
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On my barrels, the actual rifling 'twist' rate (1-?) is stated immediately before or after the '5R' designation. If not stated on your barrel, this can be determined by the simple 'patch and cleaning rod' method.
 

David Lee Valdina

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I had a Remington rifle with the 5R barrel and my own experience is that it did not shoot any better than rifles with the conventional rifling. In all fairness, I was not then, nor am I now, really good at benchrest accurate shooting with these centerfire rifles. But I did want to share my experience. Can it be a benefit, probably. But I suspect you really need to have everything else top notch to notice it.
 

gunzo

Buckeye
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My memory fails me a bit more often but.... I seem to recall one, if not the main advantage with 5-r is that it may not foul as bad as conventional rifling.
If this is the case, a good shooting barrel might not need to be cleaned as often & continue to shoot well for longer strings of fire.
 
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"If this is the case, a good shooting barrel might not need to be cleaned as often & continue to shoot well for longer strings of fire."
This does seem to be the case with my 6.8 'pistol' barrel. 100% of the use is suppressed and cleaning is about 3 wet patches and 2 dry ones-which is exceptional.
 

krw

Blackhawk
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Without looking hard, I think Boots Obermeyer championed the 5R style of rifling. I understand it puts less stress on the jacket of a bullet. Kreiger will tell you it makes no difference on accuracy vs their standard 4 groove pattern. Kreiger, Bartlein, Brux's roots all go back to Obermeyer
Their is just a whole lotta difference between a custom hand lapped cut rifle barrel vs a standard production rifle
 
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