HELP... Shots dropping off more than expected. Remington 700 .308 Hunting Rifle

Darn it. Not sure I have enough time before the trip to send the scope into Vortex.
Are you absolutely sure they are cracks?
The pics look like movement scratches to me, and that corroborates your use with a led sled. Yes, led sleds can damage a scope but most likely the scope will hold up to some level of abuse.

If those are actual cracks the scope body is compromised and I wouldn't rely on that scope anymore. Even if it was still functional a crack will let moisture inside. If your on a budget a good basic 3x9 scope can be had very affordable and will work for your upcoming hunt. A 3x9 will have a larger FOV anyways than your Crossfire you may end up liking better for your usual hunting on your home turf.
 
I would get behind the scope and check the eye relief. You should be able to tell if it moved.
 
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