I've been taught if you've got a projectile thats not listed you just pick the next heavier projectile of the same type and use its load data. If your confident, you can go past the the heavier projectiles max load, but stop when you start getting pressure signs.
90gr pills is perfect for a 243Win with a 10 twist barrel - thats actually to bullet weight it was build around back on the 1950s. I absolutely love 243, I've had them with 7.5, 8, 9, 10 and 12 twist barrels - all for different applications. I'm currently shooting a 243Win fitted with a 7.5twist barrel running 109gr Bergers at a 3020fps - accurate as can be.
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