Any chance you can post some pics and info on the load development?
load development was fairly straight forward. I'm at work/away from my range book, so this is off the top of my head:
First try was:
I tried Barnes varmint grenades with not great results with both h335 and varget.
I did have one instance of three flyers all going into one hole

D) but was unable to replicate it and eventually gave up.
That was:
winchester brass
50gr barnes VG
federal primers,
26.5 varget
This was with car stock, with falcon 4-14x44 in Leupold rings, pws triad, 1:9 barrel and mostly off of a set of range bags.Gas setting was 3 or 4(?)
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(this is load development attempt two)
I seated the bullets too long and they would not feed from mags.

Don't know what I was thinking. The XCR does not like when you seat em long, and I was feeding them one at a time, in a LAR mag.
Horizontal stringing was the biggest of problems but I still got some results:
The best (of the worst) was roughly 2.5-3 moa ( I could cover all five holes with my index,middle and ring finger) with 24.5gr.
I went home and tried it again with deeper seating.
These results were around 1 moa. Best group was 0.8 MOA (covered by the pad of my index finger) four shots, with one flyer (called). This was with the prs stock and better bags. Front rest used was one of those sh*tty plasticy red things (mtm I think) on both times out.
The load I am using now:
imr 4064 - 24.5gr
nosler 60 gr varmint
federal primers
mismatched brass (i know i know...)
I seat to the cannelure, no crimp yet (the lee die arrives today!

)
I choose 4064 because of the surplus amount I have from reloading for garand and m14, and the temperature stability.
The noslers were an attempt to try a heavier bullet for coyotes.
I expect that using consistent brass and with a light crimp this will be a performer for me. As soon as I decide on optics !
This time, the xcr was 1:9 with levang linear, sightron fixed 10x in burris extreme extra high rings, with nea adapter and magpul prs.
gas setting was 1.
YMMV, I hope this helps a little (sure took a while to type, seems my memory is not as great as it once was), as I am by no means a fantabulous shot, or an experienced reloader.
ALSO: Please don't take my loads as gospel, check your manuals and for signs of pressure.