Posted by Pete van Meurs on Jan 11, 2012; 8:20pm
URL: http://oldforum.flyshooter.com.au/6BR-throat-errosion-question-tp5136769p5137934.html

Denis,

This is probably somewhere near the mark. Don't forget that the relatively sharp little edges of a newly cut chamber's throat will be the first to be eroded (actually molten off). Some guys keep altering their seating depth to maintain the same "jam" or "jump" depending on preference. I have discovered that starting with .010" jam and no change to the seater that after 1500 rounds the throat eroding to the point where it now has .025" jump with no change in accuracy!!!  There is a reduction in velocity  but while the accuracy remains I do not change the load either. My original 6mm Dasher (Red 7) was a match winner from day one right up to it's retirement after about 2000 rounds without changing anything (last match was it's lg win at 2011 Federal Cup).

Pete