What is your experience as to how throat erosion progresses? Is it a straight line increase as rounds increase; or is it more erosion in the beginning and then tapers off; or less erosion in the beginning and more as time goes by?
What is your experience as to how throat erosion progresses? Is it a straight line increase as rounds increase; or is it more erosion in the beginning and then tapers off; or less erosion in the beginning and more as time goes by?
So how has experience been with need to “chase the lands” vs maintaining established BTO as throat erodes? I’m thinking there may be a more important bullet seating depth related to barrel length and the point the projectile exits the barrel.?? Complete theory at this point but wondering what everyone’s experience has been.
Before wear, was your seating into the lands? The reason that I ask is that in the short range group game, seating somewhere between touch and jam, I have seen competitive accuracy go away and then be restored with as little as a .002 adjustment, seating the bullet longer. I think that the overriding principle here is to do your own testing and believe your targets. If you are looking for answers on the internet that you can easily determine for yourself, doing your own testing. My question is, why?For several years I followed the "chase the lands" theory , and it worked well . Then ; strictly by accident , I found a CBTO that "HIT" the accuracy node , and I figured I'd seat at that number till accuracy began to deteriorate . Eight hundred rounds later , I'm still using the same seating depth , and still shooting very high numbers . This may be workable for this barrel only , but I can't give a opinion at this point . Barrels are like children . Everyone of them is different , in everything .
EVERY Barrel, ( Steel Quality / Hardness ) and EVERY Powders HEAT Index Number, is DIFFERENT and answering the OP's Question, AIN'T gonna,.."Happen" as it's pretty much, UN-knowable, "across the board",.. IMOYeah, if you test and find best CBTO off the lands then erosion doesn't matter from there.
But that doesn't answer OP's question(I don't think). And I don't know the answer to that.
The last few barrels I've burned out had relatively low land erosion. Seems like lands had moved ~.080" with the last. But I didn't pay mind to the rate..
No . I was seating .015 off touch to begin with . Typical seating for the Juggernaut in F-TR shooting . I have no idea where it is now , and don't care as long as it keeps giving me a good X count , and high numbers . When it goes away , I'll figure out what to do next . Hopefully .Before wear, was your seating into the lands? The reason that I ask is that in the short range group game, seating somewhere between touch and jam, I have seen competitive accuracy go away and then be restored with as little as a .002 adjustment, seating the bullet longer. I think that the overriding principle here is to do your own testing and believe your targets. If you are looking for answers on the internet that you can easily determine for yourself, doing your own testing. My question is, why?