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The original 6.5×52mm barrel design, developed by the Brescia Arsenal at the same time as the cartridge before development of the M91 Carcano rifle itself, used a gain twist barrel with deep rifling to reduce wear and give consistent accuracy.
Rifling of a 105 mm Royal Ordnance L7 tank gun Conventional rifling of a 90 mm M75 cannon (production year 1891, Austria-Hungary) Rifling in a GAU-8 autocannon. Rifling is the term for helical grooves machined into the internal surface of a firearms's barrel for imparting a spin to a projectile to improve its aerodynamic stability and accuracy.
To make the 6.5×68mm an awesome long-range cartridge, rifle barrels with a 200 mm to 230 mm (1 in 7.9 to 9 inch) twist rate are a better choice. Due to the large case capacity in relation to the 6.5 mm (.264 inch) caliber bore size the 6.5×68mm is very harsh on barrels. The 6.5×68mm typically wears out a rifle barrel in 500 to 1000 rounds.
FX Airguns is known in the industry for its proprietary "Smooth Twist" barrels, which uses hybrid riflings with a long smoothbore portion and press-forged slow-twist riflings near the muzzle. FX later introduced the "Smooth Twist X" barrels in 2017, which allow the user to easily switch barrels of different calibers and a different twist rates .
Thus the optimum rate of twist for this bullet should be approximately 12 inches per turn. The typical twist of .30-06 caliber rifle barrels is 10 inches per turn, accommodating heavier bullets than in this example. A different twist rate often helps explain why some bullets work better in certain rifles when fired under similar conditions.
The 8×68mm S has a good long range accuracy reputation i.e. it is not hard to develop or find loads that will shoot 1 MoA or better out of decent standard mass-produced rifles. Factory 8×68mm S rifles often have a 650 mm or 26 in barrel with a 280 mm (1 in 11 in) twist rate, which works well in daily life. This twist rate was chosen since the ...
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Various calibers. available between .22-250 Rem. and .416 Rem., premium wood stock, matte metal finish, buttoning used on rifling for 22 or 24 in. stainless steel barrel, action made from 416 stainless or 4340 chrome moly steel (either left- or right-handed), 3 or 4 shot mag. supplied with 5 shot test target.