Throat erosion

one thing I forgot to mention, probably because I take it for granted is the 'LEADE' itself. It's not magic.

Rifling when cut into a barrel is square and untapered with the bore axis and when the process is finished has a sharp 90 degree edge to the chamber. The LEADE itself is the rifling that gets cut from the reamer used to chamber the barrel. If you go to Pacific tool and Gauge, you will find that on quite a few of their reamers, they offer options, so you can specify what measurement you want your LEADE to ramp from full value 0 to absolute value.
 
I think that throat reamer may restore the accuracy. PTG has throat reamers with different leade angle, typically in 1 to 3 deg range. 1.5 deg is very common. Does it affect accuracy?
What leade angle would you recommend?
On a side note: I think that throat is free bore + leade.
 
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alexgrigori said:
I think that throat reamer may restore the accuracy. PTG has throat reamers with different leade angle, typically in 1 to 3 deg range. 1.5 deg is very common. Does it affect accuracy?
What leade angle would you recommend?
On a side note: I think that throat is free bore + leade.
Click to expand...

Once the rifling is gone it is gone and the barrel as well. One thing I think could be of interest is to have the bore bored Clean and re-rifled I have head this done with good results, but hard on reamers as the metal has become hardened. There is a limit to overbore and re rifle as well. The Leade itself is a gentle taper up to the rifling. Freebore in my opinion is the distance from where the chamber ends to where the Leade is 50% height of full rifling without engraving on the bullet itself.
 
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Best thing to avoid fast throat erosion is do not use double base powders like VT 540 550 series and most all or all RL series they are double base.
The Extreeme Hodgdon powders are one to use
 
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