I'm aware it's a sellers market. I will hold off until the market settles. I gave a new box of Barnes TTSX 165gr to a hunting buddy today and he forced me to take 10 bucks. I will wait until prices come down or people come to their best common sense. I will no longer be looking for this brass.
I switched to imperial on the case body and the redding graphite lube for the necks, nothing ever gets put on the shoulders. Seems like most people agree it's a lube or air issue. I would rule out vent hole since it's not every case. The only variable would be the amount of lube applied since...
IMR 4350 is really too fast for high speed loads. I use Retumbo in mine for best velocity. If you're okay leaving a lot of velocity on the table, just use a chrono and load to known 25-06 nodes, see how it shoots.
I guess my question would be why? I coat target bullets in small cases, but never would for a hunting round. What happens when you hunt in moisture? Also doesn't the nickel plating lower resistance down the bore anyway?
Have you heard of the Hornady modified case gauge? That's what I've used for years. Mono's and bonded usually about 0.050", and I'll do the berger method on cup and core.
I've never done the Alex Wheeler method but I know a lot of people swear by it. Just Google it.
Before you go to far down the rabbit hole and spend money you may not need too, why don't you check your magazine and see how much room you have. A hunting buddy has a Tikka 300 WM and the magazine doesn't let you get very close at all to the lands.
Love the 22-250AI, but if I was starting from scratch I'd probably go with a 22 Creed. Velocities are almost the same but with a bit of taper it should feed better and make for less headaches. I have the dies and will probably stick with the AI, but I don't know if I would if I was starting over.