To be honest I didn’t even check, but there is a good chance it was a different spot and that would make sense since every old timer had the remark of “wow I have seen that box in years”
The barrel was spun up by keystone accuracy and everything checked out with the gauge, I’ve run other SK std and haven’t had any issues.
If the barrel headspacing checks out, it likely is a trigger fire control and bolt timing issue. How low do you have your TT Primary set? They are rated for 1.5-4# if you are on the ragged end of minimum try increasing it to 2 pounds just to isolate the issue.
I don't have an issue with mine as long as I keep it clean. And I have to say that I hear about a lot of issues with all the manufacturers of .22LR products, its not just Zermatt - but I believe its the nature of .22LR vs Centerfire.
The guy you took it to couldn't have been a very good 22 smith if he actually couldn't figure it out. There are no "firing pin" documented geometry issues according to Zermatt, other than folks that don't head the warning not to excessively dry fire them causing damage. I have 2 RimX actions and early and late model serial number, put together myself, several thousands of rounds through them, never had a single light strike and/or fail to fire. My Primary has a single stage TT Diamond set at 6 ounces, the other a TT Special 2 stage set at 8 and 6 ounces. I chamber clean only between shooting sessions, brush the face of to ensure the extractor groove is clear and wipe the bolt clean, lube. As stated above issues with 22s are inherent in all models and manufacturers. I know several that have had issues with Vudoos that switched to RimXs and vice versa. When you have problems you just have to actually ask the guys that know how to work them out.
Most likely the cause, any trigger believed to be set at the "lower limits" can actually be below if an initial measurement was not taken from the factory adjustment. The trigger may adjust lower than the range designed such as your Primary is 1.4-5# but you may actually be 1.2-3 that throws the trigger and sear engagement timing off and the firing control may not fully cock on close as intended.
FYI, I believe every single 22 precision platform has had an issue one way or another. I think if you have a good smith put together your RimX then i doubt you will have an issue. I have had two and both of them run perfect. I am diligent about cleaning my RimX. Never an issue with both of mine made by Desert Precision Gunworks or Keystone. The OP issue, I bet is trigger related. I bet if he increases the tigger pull weight, the issue will more than likely solve itself. Good luck on getting the light strikes resolved.
Im going to play around with the trigger and if that changes anything. I planned on swapping out the barrel anyways for something a bit heavier, so I’ll just send him a bare action and have him fit up a barrel to rule out anything.
It’s a tiny bit tight, so maybe I’ll shoot Ray an email in the morning about this and see what he says. I know my other bighorn/zermatt actions took a tiny bit of finessing especially my origin but swapping out the cocking piece did remedy the issue.
I shortened my cocking piece by about 0.025” (in 0.005 increments and test).
I did that with my original cocking piece on my origin till they released the improvement to the fire control system
I’ll can do that, I’m supposed to run a mini match this weekend and should have plenty of spent brass
Joys of having a prefit barrel, I had one FTF out of 70 yesterday and simply getting an other hit on the rim did the trick.
