2 Groove Barrel

There is more variation barrel to barrel than 2 groove to 5 groove. A good barrel with either will shoot just fine. Back in the 60s when .303s were standard for full bore target shooting, there was a feeling that 5s were better for long range (to 900y) than 2s. It has also been suggested that a 2 will last longer than a 5. For all practical purposes, don't worry about it.
 
Nope. Using two rifling grooves was a wartime expedient thing. It reduced the time it took to make the barrel without reducing accuracy. If the barrel is ok, internal diameter etc, it'll shoot just fine.
 
U.S.1903 /a3 also a 2 groove barrel

sunray said:
Nope. Using two rifling grooves was a wartime expedient thing. It reduced the time it took to make the barrel without reducing accuracy. If the barrel is ok, internal diameter etc, it'll shoot just fine.
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When the U.S. started making the Springfield 1903/a3, the barrels on these rifles were made using 2 rifling groves.
 
It is interesting to note that 2 groove rifling was a wartime expedient and was not used, to my knowledge,either pre or post war. I have also noted greater variation in bore diameter in the two groove barrels. Accuracy in a tight bore appears to be similar for most purposes. However, when accuracy starts to degrade it appears to occur much more radidly in the two groove barrels. It is my general impression that the two groove barrels tend to heat up more rapidly although I have seen no emperical evidence to this
 
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