Tell me more about the theory behind not using 3 grove, because I saw others advocating it.
The theroy behind the 3groove is that it is supposed to give longer throat life in certain applications, for example using a 3groove 1-7" twist for a 223 Remington is a good idea and you would have no problem's.
But the bigger the case capacity (for bore size) and the faster the twist the worse of an idea the 3groove becomes, the lands are just too agressive for frangible bullets at higher velocities like in the 22-06 .this condition worsens at the first sign of fire cracking in the throat , so a bullet that might shoot awesome for the first 200 rounds suddenly start blowing up after they leave the muzzle.
I have built many large capacity 22 and 6mm fast twist for hi B.C.bullets for long range varmint hunting and have found from trial and error that 5 or 6Groove barrel's are superior in every way. a 3groove is awesome for a 1-10" twist 30-06 but is aweful for a 1-7" twist 22-06.
B
