I'm a little late posting this, I actually forgot about it. Today I shot the Tikka T1x 17 HMR with the Tikka T1x 22 LR bolt. Feeding was nowhere near as smooth when compared to the 17 HMR bolt. Extraction and ejection was perfect with the LR bolt in the HMR, feeding was the only issue. I also reconfirmed that shooting the LR with the HMR bolt was identical to using the LR bolt. The reason for the rough feeding is the extractor on the LR bolt is not letting the HMR case rim come up between the bolt face and extractor. This can be confirmed by just doing a visual on the extractors as the difference is evident.
Here's my 22 LR with IBI barrel.
Here's my 17 HMR with factory barrel.
Both
Here's some comparison photos between the two bolts and ejectors. For the most part the bolts are the same. I took measurements and taking into account my measurement errors the bolts are pretty much the same. The extractors are different as adamjma discovered on MGW website.
This is the 17 HMR extractor. Notice the hook is shorter but the gap is wider when compared to the 22 LR extractor.
22 LR extractor.
17 HMR
22 LR
22 LR on top, 17 HMR on bottom
According to this experiment it is my belief that if a person buys a factory Tikka T1x in 17 HMR he can swap out the barrel to a 22 LR and not change the extractor. I would also "bet" that the 17 HMR bolt/extractor would also work with the 17 HM2 and the 22 Magnum.
It is my belief that if a person buys a factory Tikka T1x in 22 LR you could buy a 17 HM2 barrel and not have to change the extractor. However, if a person decided to use a 17 HMR or 22 Mag barrel with an original 22 LR bolt they "should" change the extractor just to save aggravation. Plus, over time I do believe the 22 LR extractor would eventually break.
In the end, take what I say with a grain of salt. Only thing I have really done is confirm that my 22 LR and 17 HMR bolts will interchange.