Did some more shooting today all shot at 100yds and using BH209 with CCI209m primers temp was 79* and 5 mph wind right to left reset up the breech plug for CCI209m primer and had no stick primer but did have all stick with 270gr E-max bullets and 120gr.
this target was with 200gr XTP with harvester blue smooth side in middle and then same bullet with Harvester blue crush rib at bottom left and at top left
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now used the 215gr Lehigh with Harvester blue crush rib and 120gr middle then 270gr E-max with 120gr on bottom left.with the E-max is the only time the primers stick and I would say this is the max load for this bullet.
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You might have better luck with primers if you would switch to W209's. The breech plug was designed for the length of the Winchester. With the CCI the head space is long creating a void that causes extra blow back pressure on the primer - driving the primer back out of the battery cup. I do not believe it is occurring because of you powder load. There are several people that are shooting loads greater than 120 of BH with and 200 grain bullets. But the are also using breech plug with the correct head space. With the Lehigh/Knight breech plug you do not need a mag primer to ignite BH even freezing temps.

I had it setup for W209 and they stick in the breech plug not the bolt change to CCI209M primer and placed a wash in and no sticking with all the loads just with 270gr E-Max veg wad and 120gr and they stick in the breech and the bolt.

I can understand the possibility of sticking with the e-max and 120 gr. of BH. With BH (smokeless and progressive burning) the heavier the bullet the more efficient the powder is and it does create significantly more pressure and velocity. Which of course creates more back pressure on the nose of the 209 creating expansion and certainly possible to push the primer back up into the hammer hole in the bolt.

You also have indicated you have inserted a head spacing washer in the breech plug, so you probably have taken care of the more common reason for a primer being pushed into the bolt face.

I have zero experience shooting the e-max, but a lot of experience shooting 200 - 215 & 230 grain bullets. Even today with the Super Disc I experience some primer sticking in the stack of the breech plug (W209) even when the primer has not been shot. The current breech plug is a new plug and the only plug that I have that creates this problem. The next time I strip it to clean it I will mic the stack and probably run a .243 mill bit in it to open the stack just a touch. The heat treating process does cause the diameter of the stack to shrink from its processed diameter to the diameter it will be when completed. This plug I believe has tightened more than the norm.

Hope you get everything to work for you. Now that you head spaced your BP, have you thought about trying a regular CCI 209 primer versus the Mag primer? The pressure created by a Mag primer creates enough back pressure in itself to start the primer moving back especially when all that heat and pressure needs to get through a .032 flash hole in the vent liner. Mag primers are just tough on the BP and the vent liner.

Being knight has this new plug and bolt setup and new metals I just have to work the bugs out. with the old ones it was a breeze to work on and setup. I have polished the primer packet some more and there's one more thing I have done but let me see if it works before I say what it was. don't what people doing it if it don't work.