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I has been my experience that bottleneck cartridges even those originally designed for B/P are tricky to get to shoot well. I would think the case capacity of the .303 British would be limited to all but the smallest bullets(cast).As long as you fill the case with B/P and the bullet is seated so there is absolutely no air space between the powder and the bullet you might give it a try. I personally would not, their are better cartridges to play with.
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