Sounds like your neck clearance is fine. I agree with another poster on calling Christensen. You could always ask for a reamer print too.
It is hard to find what is the best neck clearance information. Seems like anything more than .002"-.003" total clearance will work. The issue is when the neck wall thicknesses vary. That is perhaps the best reason for turning necks beside consistent neck tension, to absolutely know that all necks will have sufficient clearance to release the bullet.
Occasionally I helped a local gunsmith develop loads for some of his customs. I was working on a 6.5-284. The brass was used without turning the necks. As the load was developed there were some flyers. At one point I tried to insert a bullet into a fired case and it wouldn't go in! Asked the gunsmith what the reamer's neck dimension was and was shocked to find the brass was only .001" total clearance! The gunsmith told me he asked the reamer maker to "tighten" all tolerances. The flyers were necks that were slightly thicker causing more pressure. GEEZ. I turned all the necks and quit helping him with loads for his customs after this debacle.
Here is one comment from Accurate shooter:
"Jerry Tierney, a past NBRSA 1000-yard champion and .284 Win "guru", has observed that overly tight chamber neck tolerances can cause accuracy problems. Jerry says "some guys who were running minimal neck clearance (what ever that is?) .284 chambers weren't getting the accuracy they expected. If you open up the neck to allow more clearance, say .0015-.002″ per side, that seems to solve the problems. I can't tell you exactly why–maybe it allows a 'cleaner' bullet release–but easing the neck clearance has helped many .284 shooters get better results."
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In the Secrets of the Houston Warehouse article Virgil's 6 PPC ran the smallest clearance I had ever heard: " Virgil would then outside turn the necks for a total clearance of about .0007" between loaded round and chamber. Since the neck turner left cutting rings, Virgil sanded the necks shiny to .00075". He emphasized that until the hills and valleys were smoothed, the case neck was prevented from laying flat against the chamber. "
Once these cases were prepped he never had to size the necks again. The brass would expand then contract so all he had to do was seat a new bullet into the neck.
More:
Then came the final, critical step — the step requiring a sensitive touch and #400 sandpaper — the "tuning" step. "The secret," Virgil said, "is to get the neck tension — the grip of the brass on the bullet — exactly the same on every case. You do this by firing the case and then feeling the bullet slide in the case neck as you seat it. Here, a micrometer won't do you any good. Feel is the whole thing. If any case grips the bullet harder than the others, you take three turns over the sandpaper and fire it again, until you get exactly the same amount of seating pressure. Until the necks were tuned, I didn't feel I was ready to start tuning the gun."
link:
FYI you may want to talk to more than one person at Christensen arms. I was helping a friend with his 300 win mag and got two different answers on if their stock was bedded. First guy, just a phone answer told me yes. Action screws kept loosening after a dozen shots. I believed the stock was compressing. I called a second time and asked for a higher up. First thing he asked me was who's ammo I was shooting. Told him handloads. He immediately told me that would void the warranty. I laughed at him. I did get him to admit the synthetic stock was not bedded.
Maybe this is more than you want to know.....
