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That looks like about a 100ft/sec gain over published 6x45 data.
That should be good for an additional 3-5% energy with the larger diameter bullet and about 35% more than the 223.
The reason I went 6x45 was the mass availablity and choices in bullets.
The .257 diameter has never really had a lot of bullet choices.
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Lets remove all the warning labels and let nature take it's course.
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