I got curious, and ran a Ladder experiment at 500yds on the 140g Match Burners. This was done to re-test the initial range of charges I used when I started load dev. At the onset of load dev, I tried a course OCW/Velocity approach at 100yds (30 rounds gone), followed by a repeat of the same approach on a subsequent trip testing at a finer resolution of charge weights, coupled with a brief seating depth test (30 more rounds gone). With my initial approach, I did end up with a load that shot really good in my rig at 500yds. However, I began contemplating so many peoples opinions that I’ve read regarding no such thing as velocity flat spots. Those opinions got me curious, & began wondering if my Chrono could have been misleading me, & I wondered if I could arrive at the same, or close to the same, charge weight I ended up choosing by using a Ladder technique at distance with no Chrono at all. Just one round each of the initial charge weights, shot in order, from 40.2 to 42.0g, in 0.2g increments, all aimed at the same target, with no adjustments made to the scope.
Before going any further, I must say that prior to this test, I had only tried a Ladder once before, but it was only at 300yds, and I ultimately ended up with only one group, the size of a tennis ball, & I couldn’t easily discern any standout clusters or patterns; therefore, I prematurely abandoned the idea of a Ladder. In retrospect, that was premature. There could’ve been so many reasons why I didn’t have much luck the first time I tried a Ladder, ie. My reloading techniques were not where they are now, my shooting skills were also likely not where they are now, and I probably didn’t shoot the ladder far enough away to easily discern the dispersion which takes place. I would love to try the Ladder again at a further distance to see if more clarity can be obtained, but for the time being, the plates stands available to me at 800 & 1000 are so grown up in vegetation, I can’t clearly see the plates to accurately record the impacts right now. I’ll be cleaning them off soon, but until then, I can’t try it further than 500 until I get them cleaned off.
FWIW, the Ladder I did at 500yds was VERY INTRIGUING, and only used up 10round! I’m thinking if I had run this 10 shot Ladder at distance when I initially began Load Dev, it would have revealed a similar starting range of charges for the follow up finer resolution 5 shot/charge OCW. I’ve learned so much from the folks on this forum, and one thing I picked up on & will be trying going forward is to not attach or use the MS Chrono for the initial Ladder or follow up OCW/Seating Depth tests. Once I find a charge & seating depth I like, and I have verified the load grouping at 500, THEN it makes sense to gather Velocity Data for DOPE to be able to push them out to distance where the load can be evaluated/fine tuned for vertical at 1000.
For comparison, below are pics of the 41.4g load I ended up at using my initial approach.