Originally Posted by
Ridge Runner
from what I know about ladder testing, the test should be done at 300 yards, if you have an accurate load to start and want to tweak it with a ladder test, then 100 yards will not show the minute variences in the load, if you can see stringing at 100 yards your not ready to milk every bit of accuracy/velocity from your rifle by checking harmonics with the test.
RR
That sounds right to me. It makes sense for shooting an accurate rifle in changing temperature conditions that may cause small velocity variations. In that case the POI shift may move enough to have an effect the results.
That is a consideration for a target rifle and most noticeable at longer ranges. I have my doubts about it's value for most factory sporter rifles.