The CG-63 was made from re-barreling- "sporterizing", I guess- old m/94 and m/96 rifles. All of these were 6.5 x 55...
How common was it to re-barrel these into 8mm? Seems odd, as the 8mm would be harder hitting, but the ballistics of the 6.5 are much better- so since the CG-63 was a target rifle, why go with 8mm?
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