Experience of one but 5R. Seems just right in land groove geometry for best compromise between bullet upset and long barrel life.
5R usually generate good velocities with acceptable pressures and clean more easily too.
If there was a 3R the choice would be tougher.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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