Thread: 440m ladder test

Originally Posted by ebf

Ok, so you are pretty much focusing on "group size". Although as John pointed out above, groups of 1 kinda mean zip.

I would suggest you look at the speeds. Assuming of course you have a reliable and repeatable chrony.

Shots 5,6,7,8 are all within single digit ES from each other. It looks like a likely node in this ladder. Having said that, I would much rather look at SDs for 5 shot groups, the more data you put in the better the quality of the info you get out...

If (and it is a big IF), that is a node, then I would look at choosing a load in the middle, and playing with different seating depths. Shoot at least groups of 5. Do it at 100m and make sure the wind is not affecting group size.

As far as I understand,a ladder test is the relationship between POI and velocity.If unsuitable powder charges are used then they are nowhere near their next or previous.If it is,then they are closer together,hence 3,4 and 5 are suitable charge weights in this instance.Further testing with those charge weights will prove or disprove that.Happy to be proved wrong.