jason41987
member
- Joined
- Apr 10, 2012
- Messages
- 1,293
hey everyone.. this isnt a 6.5mm grendel or 6.8mm SPC debate, and im not here to say one is better than the other, and wouldnt like this to get into a debate...
what im trying to do is understand the rifling patterns and twist rates that these two cartridges best excel at.. and why they do best with these configurations of barrels
first, ill begin with what i know about 6.8mm... it seems most people prefer 1:11 twist, and 5 groove barrels, but 1:12 is also acceptable, as is 3 groove... what effect is 1:10 going to have on this cartrdge, does it not stabilize the lighter 110 grain bullets as well? id like to know why 1:11 is sought after and 1:10 is not
also with 6.8mm is the grooves... i hear the odd groove rifling offers higher velocity out of the barrel... but is this really enough of an increase to make odd-groove rifling a must-have?.. if so and if not, why?
as for 6.5mm grendel, ill admit i dont know much about this besides better ballistics beyond 800 yards... but what sort of rifling patterns and twist rates are best suited for this cartridge, and why?.. it seems with the greater variety of 6.5mm cartridges on the market, arisaka, schoenauer, carcano, 260 remington, creedmor that it is in fact easier to find 6.5mm barrels in a variety of grooves and twist rates, as well as projectiles
so yeah.. im trying to understand how the rifling and twist rates effect these two cartridges to get a better understanding on them both
what im trying to do is understand the rifling patterns and twist rates that these two cartridges best excel at.. and why they do best with these configurations of barrels
first, ill begin with what i know about 6.8mm... it seems most people prefer 1:11 twist, and 5 groove barrels, but 1:12 is also acceptable, as is 3 groove... what effect is 1:10 going to have on this cartrdge, does it not stabilize the lighter 110 grain bullets as well? id like to know why 1:11 is sought after and 1:10 is not
also with 6.8mm is the grooves... i hear the odd groove rifling offers higher velocity out of the barrel... but is this really enough of an increase to make odd-groove rifling a must-have?.. if so and if not, why?
as for 6.5mm grendel, ill admit i dont know much about this besides better ballistics beyond 800 yards... but what sort of rifling patterns and twist rates are best suited for this cartridge, and why?.. it seems with the greater variety of 6.5mm cartridges on the market, arisaka, schoenauer, carcano, 260 remington, creedmor that it is in fact easier to find 6.5mm barrels in a variety of grooves and twist rates, as well as projectiles
so yeah.. im trying to understand how the rifling and twist rates effect these two cartridges to get a better understanding on them both