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Open answer to a PM:
.287 brass will work perfectly in your k11 or G11 series rifles.
Although it will work in your k31, you may expect 1 out of 10 shots will not extract & eject, and that's due to...

Vacation,,,,, I wish. 35 below zero here this morning. You're on top of it............ I'm shoveling and plowing it.

https://www.milsurps.com/images/imported/2019/03/IMG_3048_zpsh1n5sttn-1.jpg

Do you have a close up of the finger grooves?
Thanks
P