Throat erosion - any rule of thumb?

H

HopeToBe

Guest
Is there any rule of thumb when it comes to throat erosion in the 6ppc? I can measure the ongoing erosion fairly well, but is a bit surprised over the numbers hence a reality check would be nice.

Tuning with seating depth only amplifies the issue making me wonder if one should look for broad tuning windows also for the seating depth, and not only the powder?
 
HopeToBe said:
Is there any rule of thumb when it comes to throat erosion in the 6ppc? I can measure the ongoing erosion fairly well, but is a bit surprised over the numbers hence a reality check would be nice.

Tuning with seating depth only amplifies the issue making me wonder if one should look for broad tuning windows also for the seating depth, and not only the powder?
Click to expand...


Throat erosion in 6ppc barrels (and any others for that matter) will largely depend on the barrel itself. More precisely, the barrel steel itself. Of course there are other factors at play too such as powders used, temps, rapid fire, etc., etc.

The broader the window the barrel has, the easier it will be to work with. Trying to find that window with powder charge and seating depth is a very good idea in my opinion. However, some barrels seem to erode so fast that finding a wide seating depth window is very hard to do. I had one barrel last year that seemed to need a longer depth after every agg just to stay in tune!
 
goodgrouper said:
However, some barrels seem to erode so fast that finding a wide seating depth window is very hard to do. I had one barrel last year that seemed to need a longer depth after every agg just to stay in tune!
Click to expand...

That is spot on with my current barrel. I started to question my procedure for measuring seating depth, asking myself if this could really be happening. The barrel shot great when in tune, but to keep up with both throat erosion and weather variables sure didn't make it an easy ride.

I have always had the idea that 1/1000'' pr 100 rounds is an OK estimate for erosion, but must admit that the science behind it is limited.
 
Not checking jam length for throat erosion has sure cost a lot of people heartburn over why their gun won't shoot anymore.
 
You must log in or register to reply here.
Back
Top