Rough 29-6 forcing cone

[Ardilla]

I have a M 29-6 with very bad tools marks in the forcing cone and a significant leading in that area, even with moderate loads and diferent hardness of bullet aloys.- My plan is to lap the cone with a brass lap sold by Brownell's.- The angles of the laps ofered are 5, 11 and 18 degrees.- Please, someone knows the right angle for my gun? Thank you very much

 

[Alk8944]

Assuming it has not been worked on since it left the factory it will be 18 degrees. Don't try to remove every mark, just the high points of the ridges.

 

[Ardilla]

Thank you Alk

 

[Tom C]

I believe the angle is more in the range of 7 to 8 degrees. I find 11 degrees too steep and 5 degrees a little shallow, but I prefer to err on the side of excessively shallow. I now use 5 degrees for everything. Works well for me.

You may need to get the cutter and do a little cutting to remove the worst of the tool marks before you do any lapping.

 

[tomcatt51]

I think it's 9 degrees.