If your just going to shoot the 60-80gr bullets then stick with the 12 twist.
The 8 twist if you get a lower quality batch of bullets or should I say your ammo/bullets have any runout etc...the faster twist will amplify the wobble of the bullet. Think of it this way...any runout your ammo has when the bullet makes the jump to the rifling it already has an alignment issue/premature wobble to it. The faster twist will amplify the wobble and have a negative effect on the accuracy.
Shooting the lighter weight bullets you don’t want 5R style rifling. Stay with conventional/standard rifling. Standard 4 groove, standard 5 groove etc...
Later, Frank
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