I got to were the shell holder was contacting the die it was still hard to chamber
I know this will cause shoulder set back ,and headspace problems which leads to case separation.
I have had 4 Tikkas and more rifles in other brands, and never had this problem with any of them
so now is it the dies not rezing it down for a oversized chamber?maybe a set of small base dies would work ,say some thing that's used for semi autos?
You do have to set the shoulder back 0.001 to 0.002", if you are running out of headspace, which appears to be the case. Setting it back that much is not going to lead to case stretching and case head separation. You can do this by taking 0.001" off the shell holder at a time and trying the case in your gun.
I do have a question that you may have answered before. Do the fired but unsized cases fit back in the gun? If they do, but a sized case does not, then the die is causing the problem.
Edit: I see you have said that unsized but fired cases do fit the gun. That confirms the die is causing the problem, and you would not gain anything with a small base die. I am very sure you are squeezing the shoulder ahead, and you are running tight headspace, that is making it hard to close the bolt.
The correct way to do this is to use a Hornady Headspace Gauge tool to measure the length of the cartridge to the shoulder. The routine is to measure a fired case. and then push the shoulder back until the gauge measures 0.001" shorter. But, from what you describe you will still have to lap the shell holder to bump the shoulder, if you have the die hard on the shell holder, and can't get any more bump.
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