This conversation has been spread out over a couple threads so i decided to consolidate the conversation. To sum up 5R rifling is providing higher velocities with the grendel. 5R rifling doen't have the 90 degree angles which means higher velocities and less copper fouling.
Hornady 123 Amax measured from my and a friends 24in AR-Stoner barrels has a MV of 2650fps vs 2580fps quoted by Hornady. Out of my 18in AR Stoner i'm getting 2560fps. Thats about what you would expect from a typical Grendel with a 22in barrel.
One of the main criticisms of the Grendel usually levied by the 6.8SPC crowd is lower MV but as you see the 5R rifling gives the Grendel at least a 80fps boost. Now you can both get good muzzle velocities and long legs and good accuracy. The faster the load the more performance boost you'll notice. When your shooting the lower grain pills like the 100gr and 95gr fast you can see as much a 150fps boost. I've cronyed 3 AR Stoner rifles now with factory Amax and all three are shooting much faster than other Grendels with the same ammo. 6.5mm pills are longer and have larger surface area that contacts the rifling. Therefore 5R rifling is going to benefit the Grendel more so than shorter fatter calibers like the 6.8SPC.
AR Stoner barrels are the Midwayusa brand and are made by liberty barrels and come with 5R button rifling.
Hornady 123 Amax measured from my and a friends 24in AR-Stoner barrels has a MV of 2650fps vs 2580fps quoted by Hornady. Out of my 18in AR Stoner i'm getting 2560fps. Thats about what you would expect from a typical Grendel with a 22in barrel.
One of the main criticisms of the Grendel usually levied by the 6.8SPC crowd is lower MV but as you see the 5R rifling gives the Grendel at least a 80fps boost. Now you can both get good muzzle velocities and long legs and good accuracy. The faster the load the more performance boost you'll notice. When your shooting the lower grain pills like the 100gr and 95gr fast you can see as much a 150fps boost. I've cronyed 3 AR Stoner rifles now with factory Amax and all three are shooting much faster than other Grendels with the same ammo. 6.5mm pills are longer and have larger surface area that contacts the rifling. Therefore 5R rifling is going to benefit the Grendel more so than shorter fatter calibers like the 6.8SPC.
AR Stoner barrels are the Midwayusa brand and are made by liberty barrels and come with 5R button rifling.
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