Powder Throw Just as Significant - Seating Depth
Good Day All,
I was looking thru some posts a few weeks ago and saw where some well experienced and seasoned reloaders mentioned and\or agreed with the following:
" ... seating distance is the single largest factor in accuracy .."
It was also mentioned that once you find the sweet spot seating depth, making some adjustments with the powder charge would not affect the groups as significantly.
I certainly do not have the years of experience that some have but .... among other things; seeing that the bullet touches the barrel as it travels downward... barrel harmonics are affected and are not static for each bullet or bullet type. In other words, different bullet velocities change the assocated barrel harmonics as well....
Having said this, I decided to test the theory that powder throws are not "quite" as significant as seating depth. Wth 4 rifles and their applicable reload recipes that were in sub moa groups I went to the range and changed powder charges +- .2 and .3
Groups immediately opened. No if ands or buts.
I noticed a post on another forum. Increased the charge either .2 or .3. Groups went from almost 1.5" to sub moa.
My experience tells me both are very important, critical and go hand in hand. Actually I might be able to make a .005 - .007 adjustment in seating depth and nothing happen, but if I make a .2 change in powder, it makes a difference.
My conclusion; there is an associated correlation between sweet spot seating depth and sweet load powder charge. The combination can be fairly easily affected by changes to either, thus requiring to reload test all over again.
Heck, maybe this is what you are all saying to begin with and I just didn't understand