Are these actions the same barrel shank thread size?

I just tried screwing a barrel from an L61r into an L579 action and it didn't want to go.

SAKO L61R`s threath diameter is .046" bigger than L579`s.

Ah, but is the pitch the same?

Here's what I have, all are 16 V tpi - L-46 thread lenght .845, outside thread dia .855

l-579. tl is .870 - osd is 1.00

L-61. osd is 1.046.

L-57. 17 V tpi, osd. is .984

Info. is out of Bolt action Rifles by Frank de Haas

Hope this helps you out. --- John

Very early L61s were 1.000" OD.

Not sure what years or serial number range constitutes very early. Suffice to say, I've never run across a 1.000" L61R.

Once again, thanks for the informative replies. The OSD of this barrel is 1.042" so apparently for a large action... so more than a little fitting will be required.