Originally Posted by
ronlaughlin
I have tried and tried and tried to keep a good count by tracking spent primers. It is, for some reason, impossible for me to keep track of which box of primer came from which rifle. A very poor inaccurate answer is less than 200 shots per vent. More than 100; less than 200 is the best answer i can come up with right now. Some seem to wear faster than others. It may have to do with the length of the flash hole. I am not done collecting data and formulating conclusions. Many have written that they notice accuracy suffering after the flash hole wear to 0.035", so i just set them vent aside, and replace after it erodes to 0.035". I believe i have replaced vents with less than 150 shots on them.
Interesting....
Obviously, this issue is now on my radar. Since I dont have ready access to pin gauges I bought a touch cleaning kit and then sized up the cleaning wires on touch tips which were marked at .030 and .035.
My theory is when the .035 wire will go through the hole the plug or vent liner is done.
I have a Lehigh Plug I use on a couple different Knights. I haven't kept an accurate count but I must have over 300 rounds through this. Mostly BH 209 but some T7. I tried to run the .035 wire through, no go. I tried the .030 wire and it also was a no go.
It looks like I have very little if any wear if they start at .028. One note: I usually shoot 100 grains or less. I wonder if this could make much difference?