Shooting long range help

I have been a long time member here but honestly not a long time long range shooter. My local range for many years only allowed 300 yards shooting and it was often crowded. Well My wife and I moved to our own property a few years back and I finally cleared out a 600 yard range. How do you know when working up loads if it is you, the weather (wind and such) or the load if your groups are not the greatest? My shooting range is not too effected by wind (most of it is a clear cut path through woods) so I think I can eliminate that from the equation. I would say maybe 100-200 yards of it is slightly open to winds. So for example, I recently worked up a load for my 28Nosler. At 100 yards it shoots between .6- .75MOA at 100 yards. I had 3 rounds left and said screw it im shooting 600 lol. at 600 I shot an 8 inch group with those 3 remaining loads. 2 of the hits were within 4 inches of each other and strung vertically for the most part but the other hit was in between the two height wise but was about 8 inches left. So for an in-experienced long range shooter, how would I know if I pulled that shot, or maybe the wind caught it or maybe there is an issue with my rifle system (bedding issue) or a problem with my load? I understand to truly know I likely need to shoot many more rounds, but im just trying to limit the rounds thrown down the tube to hopefully preserve the barrel. I do not intend to shoot this rifle a ton so would like to keep the tube as long as possible. I will never be hunting to 600 (400 yard max where I hunt) so really it is not too much of an issue but I do want to try to improve myself. I am pretty consistent when reloading so I don't think it is an issue with my loading process itself but could be an issue with my load. Thoughts?

FYI, I do not have people near me to shoot with to confirm if it is me or the load or the rifle etc or to have someone help in person.
Ask your Mrs. To take a couple of videos of you. Cell phone works great!
 
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