5mm RFM throat question

[cornbelt]

Does anyone know what a 5mm RFM throat looks like? Need to make a reamer. Thanks.

 

[Jim Watson]

Beats me. SAAMI Rimfire does not include 5mm.

 

[cornbelt]

Well, a forcing cone on a revolver is 11 degrees. Guess I could start there.

 

[BBBBill]

... and some revolver forcing cones are 18 degrees and a few (Ruger) are 5 degrees.

 

[Jim Watson]

Most rifle leades are in the neighborhood of a degree or two.

 

[cornbelt]

What about .204 Ruger?

 

[Bart B.]

Page 60 in the following shows the 204's leade angle at 1.5 degrees for SAAMI specs:

http://saami.org/specifications_and...ns/download/Z299-4_ANSI-SAAMI_CFR.pdf#page=13

Your barrel chamber's leade angle may be different.

I see no SAAMI specs for revolver forcing cones in:

http://saami.org/specifications_and_information/publications/download/Z299-3_ANSI-SAAMI _CFPandR.pdf#page=10

There are leade angle specs for pistol semiautos. Test barrel leade angles for both are over a wide range.

 

[cornbelt]

Thanks. I'll check it out.

 

[boom boom]

Try CIP, the European alternative to SAAMI. Has technical drawings of cartridges and chambers in three languages. http://www.cip-bobp.org/ Also has listings of European proof marks for those that are interested.