If competing up to 300 meters, you won't see much advantage with the higher BC's of such projectiles unless the wind is really blowing and/or the target small. At 200 yards on the big SR target, we rarely see conditions where a small reduction in wind deflection yields a higher score.

For a .310"+ groove Krag, you might check out the .311" Sierra 180 FB (which works well in many .303's) - or even their .311" 150 FB.

Main problem with the boattails is a propensity to yaw in long, wide throats like the Krag's, engraving off-axis*. They're all worth trying though. Never know 'til you fire some for group.

*Crude sketch of yaw in long throat, BT vs. FB.
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Wind graph shows significant advantage for higher BC at 600, not so much at 200.

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