I have been shooting a low wall Winder ‘87 in .22lr in the local matches and it’s shooting inside of one inch at a 100 yards most of the time. It’s got a good, I think, Shilen 4 groove ratchet bbl. there is a problem with the action though. When it’s closed the breech block (bb)is not parallel to the barrel breech face. When it’s locked up the bb just kisses the bottom of the barrel tenon and at the top of the tenon a .007” feeler gage just slips in. There is no extractor fitted. Basically the bb face has a .007” though taper. How much or how little do you cognoscenti think that affects accuracy? 
Thanks Richard

Richard,
For how it is shooting for you, I'd leave it alone.  The effect of the angle on the base of the case, about .002" over the diameter of that cartridges base.  A few originals I've checked live with that much.  Attaching a number to the accuracy effect? In a 22rf with mass produced ammo even with quality ammo? I won't venture there.
Most folks measuring with their calipers can't consistently measure much closer than what you have.   

If it's a mental thing and it's going to eventually cause doubt in your shooting, remove the bbl, measure the differences top to bottom, side to side from the face of the action.  Remove the bb, set it up in a toolmaker's vise on your surface grinder and shim things so you get exactly the differences in your setup on the grinder- and kiss those surfaces. Be sure and measure two or three times to confirm everything and you will take misalignment to zero.   
You will have to set the barrel back, re-time it, re-cut the chamber, re-harden the bb face, adjust the flat spring with a new dovetail block, offset to accomodate the shortened distance for the flat spring... or being a Winder, it has a coil? Re-fit the forend to the action, what'd I miss?

I've seen the rest of your work and you've shared results on this build, there is nothing to doubt what you have going as is, leave it be and start a new one. 

With the number of 1885's I play with, class and all, I made a ring gage that is a class 3 fit to most threads and the faces are perpendicular as close as my equipment can measure to the pitch line.  This gives me a means to measure and true the action and the breech block.  Attached pictures of what that looks like.   Is it worth the effort, not usually for the 22. 
Good Luck
Greg

Here's a common occurrence I've seen with my inspection setup, even with better ammo so what does that tell you?

Unless you're going to inspect every round to cull the bad ones, which is mighty tedious.

Thought I had a gif of this with a fired case, can't find it... The only wobble was where the fp smashed out the rim a bit - positive ignition.

GT wrote on Sep 6^th, 2023 at 2:52pm:


Fireformed, ready to reprime and reload!