Probably so.
Loads are starting loads for the 6.5x55. Ackley chambers are nothing magic and do not insure greater velocity (myth 1) nor longer case life. (myth 2) They give a higher velocity at 1/4 the increase in powder charge. If you increase powder by 10% expect a 2.5% increase in velocity. (all other factors remaining the same, of course) ~Muir
The only advantage for the AI is less case stretch, you need more powder to get the same velocity, I used to shoot a lot of F class with a 6.5x55 a friend had the AI version
he was loading 5 to 6 grains more powder for 50fps more velocity and mine had better accuracy he had his re-chambered to 6.5x47, you would be better off with a 6.5-284
case capacity is about the same as the 6.5x55 AI barrel life is similar and you don't have to fire form cases. Robert
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