The issue is the twist, or the RPM of the bullet.
I ran into this a few years back with my FP in 223.
Midway lists velocity, but no twist or RPM rating; which is the relevant info.
I know the .224" 55 gr dogtowns have about a 240-260,000 RPM rating
Don't know that it translates to a 243. but here is the formula, and your RPM(if it does)
MV * 720 / twist = RPM
3000 * 720 / 9 = 240,000 RPM
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