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Originally Posted by rebs
I shot a box of remington 223 55 gr and they were really accurate so I figured I should be able to duplicate their load.
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As I understand it, barrel harmonics tend to support your idea, but the vagaries of internal ballistics trip that up a little. How fast the bullet accelerates inside the length of the barrel may cause your barrel to flex (or "whip") differently.
You are on the right track, but will probably still need to do some "tweaking" of the load to achieve the tightest groups and/or the same point of impact.
Do get a chronograph. It will help tremendously.
Good luck.
Lost Sheep