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Bullet is Nosler 55gr Ballistic tip moly in .243.
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Time to clean your barrel, really well. The moly is adding drag to your load, how much I do not know. With a 1:10 twist rate you should really be using heavier bullets, mine are 85, 95 and 105 grain 243 bullets. I know nothing about the powder you are using, but slower powders like H-4895, IMR or H-4350 will give you a higher pressure curve and push the bullet out faster.
For a 55 grain (non-moly) 243 I would try IMR-8208 for a high speed A$$ kicker. But that is only supposition since I only use IMR-8208 on 55 grain 223 bullets. For 243 my favorite is the Hornady 105 grain A-Max with H-4895 powder, it is more important to me it goes to the same spot each time than that it gets there 1/10,000 of a second faster.
Just my take on the issue.
Jim