I am shooting the "CZ550" load suggested by Bob Mitchell, he has a blog on this
New Hornady Brass Winchester Mag Primer 70g R17 3.37 OAL
re Temperature, this is my take: get your load sorted out when the temps are similar to your hunting season. I am not sure if the 20-40d F variation is enough to worry about that you could see during the season. If your hunting hogs in Texas in July, then late season deer in Saskatchewan, taking 400+ yard shots, you may need to compensate, I read in another forum velocity difference is 1fps per degree temp with r17.
On another note, using V550, per someone's recommendation, I loaded +p 325g ORYX bullets. Grouped just over an inch, maybe it would do better, but my trembling after the first shot could have thrown me off. If there is a need for detached retinas and a concussion, shoot this from a 7lb rifle prone
I calc these loads on quickload, CZ550 has probably posted load data for the 286part somewhere, these are +p+ loads that he posts
