Dan,
I hope you got some more shooting time with your GAP10 in .22 Creedmoor, especially on coyote! This is a perfect cartridge for longer range predators and varmints because it has the horsepower for the longer, heavier bullets.
Does your barrel use the mid-length gas system or a rifle-length?
I built mine with a custom rifle-length gas system which controls the gas pressure a bit better. 24" barrel, rifle-length gas system with a custom made gas block. with an infinitely adjustable range from off to on based on the gas port diameter. The twist rate is 1:7" in a Bartlein barrel using my own contour because of the gas system.
Josh at CCCC does a great job of creating good loads for situations like this.
You do have some negative aspects. 1:7 is only suited to 75+ grain bullets more like 90 grain because of the speed. But the 23-inch barrel hurts because you need slow burn rate powder for heavy bullets.
I've been running everything from 90 grain VLDs down to the 55 grain Barnes TTSX-BT in this barrel without any loss or compromise of accuracy. The 75 gr. AMAX is a favorite until I run out of the supply I bought when they were discontinued. The 24" is excellent when the proper powders are selected and used. Currently, I'm running Re-16 for the lighter bullets up to Re-25, 26 for the heavier, longer bullets. There are others but these work the best for the way I reload.
The .22 Creedmoor is also exceptional in a bolt action rifle whether for varmints, predators or longer range target shooting. I have both. The 30" barrel is good for 1,200 yards since it's still supersonic. Lots of fun on steel.
Enjoy your project!