I don't get it, Carman.
How can you be so meticulous but blow right by case length? How can you shoot sub minute groups but post issues with your load? How far are you printing these sub minute groups? 100? or a real long range? If you're not shooting long you should I wonder if you're still sub moa at long range with velocity issues and consistency issues like that. It won't show up negatively at close range but long distance will make an honest load out of it. I apologize man...I'm just lost as to how such a super performing load and an experienced handloader such as yourself can print groups so well but kick out such ugly Velo, ES, SD...ugly enough to make you question it yet still defend it. I'm not being a smart *** this time...I'm really, really lost and looking for answers.
A couple things to consider to tighten up your numbers-
I'd, at the very least, consider them ~maaaaybe~ even try some before dismissing them out of hand:
Neck tension (consistency!, You can fine tune the amount with a NS bushing die...even an FL bushing die)
Neck turning (esp since you have that super tight factory match chamber you're barking with).
Anneal. (some do, some don't...but since a monkey can handle the task with a little focus and since bullet seating is NOTICEABLY smoother, I DO IT!)
Check your brass length before and AFTER you drag that expander ball through your necks. I bet you find something there. (Those **** balls are only good for UNdenting a bent mouth or two, IMO)
Consider Neck sizing with a bushing die (FL or NS only) or Lee's collet die (cheap and VERY good)
Sort your projectiles by bearing surface
Seat to a consistent depth (into consistent cases)
Try brushing the inside of your necks with a nylon brush with some 0000 steel wool wrapped in it.
Check your case capacities and sort/cull/load accordingly
Make sure there's no lube/oil in your tube, chamber, and bolt body. (run a patch of denatured alcohol through followed by dry patches until it's dry)
Have you checked your headspace?
Have you uniformed your primer pocket?
Debur'd the flash holes?
Some tubes need copper "fouling" in there others need zero.
I heard tell of story one time where a fella couldn't get his stick to group under expectations for anything. Someone suggested cleaning out all the copper and using just one type of bullet as he was shooting sighters with factory ammo to "warm up" then switching to his handloads to do his testing. As it was explained the differing copper properties can cause an issue with consistency that's **** near untraceable. I don't recall his outcome but I called BS at first and tried it myself because I had the same type of problem with one of mine and I'll be damned if it didn't tighten up the groups of my old, old Weatherby. Hocus-pocus? Voodoo? Maybe...I thought the same thing. Learning.
Good luck.