16in50calNavalRifle
Member
- Joined
- Mar 7, 2009
- Messages
- 355
I have read a fair amount on this topic here and elsewhere and think I understand, but would like to confirm that.
In revolvers, to test for bullet fit, you first slug the bore. With this slug sized to the bore groove diameter, you then check the chamber throats.
If the sized slug passes through the chamber throats easily - indicating that the chamber throat diameter is equal to/greater than the bore diameter - then lead bullets should not (other things such as powder charge and bullet hardness being OK) cause much leading in the cone or bore. The bullets are not "under-sized" by the chamber throats and thus do not allow gases to cut and blow by the bullet base in the cone and bore.
If, on the other hand, a sized slug does not pass easily through the chamber throats, a lead bullets may be "under-sized" as it leaves the chamber, which means the bullet base has not obturated as it enters the cone, resulting in leading in the cone and bore.
I am going to run this test again today, but on my Model 66-2 I believe a slug I sized to the bore passes easily through 5 of the 6 chambers, but is a fairly snug fit as it passes through the sixth chamber.
So a related question to my overall query here is: how loose/snug a fit is OK for the slug passing through the chamber throat? Must it pass with gravity alone, i.e. does a slug requiring a push through the throat indicate a chamber that is under-sized?
Trying to identify and correct the causes of the leading I have had in this revolver with every bullet and charge combination I have tried so far. Thanks to all for your help.
In revolvers, to test for bullet fit, you first slug the bore. With this slug sized to the bore groove diameter, you then check the chamber throats.
If the sized slug passes through the chamber throats easily - indicating that the chamber throat diameter is equal to/greater than the bore diameter - then lead bullets should not (other things such as powder charge and bullet hardness being OK) cause much leading in the cone or bore. The bullets are not "under-sized" by the chamber throats and thus do not allow gases to cut and blow by the bullet base in the cone and bore.
If, on the other hand, a sized slug does not pass easily through the chamber throats, a lead bullets may be "under-sized" as it leaves the chamber, which means the bullet base has not obturated as it enters the cone, resulting in leading in the cone and bore.
I am going to run this test again today, but on my Model 66-2 I believe a slug I sized to the bore passes easily through 5 of the 6 chambers, but is a fairly snug fit as it passes through the sixth chamber.
So a related question to my overall query here is: how loose/snug a fit is OK for the slug passing through the chamber throat? Must it pass with gravity alone, i.e. does a slug requiring a push through the throat indicate a chamber that is under-sized?
Trying to identify and correct the causes of the leading I have had in this revolver with every bullet and charge combination I have tried so far. Thanks to all for your help.