Ladder analysis

[Bigwheels]

Round 3 in my ladder testing. 300WM 230 Hybrid Target. H-1000
Prior 2 ladder tests showed 2 nodes. One around 2900 fps, and a lower one at around 2800 fps. The upper node was inconsistent but the lower one is almost too consistent.
My thought is to proceed with seating depth using #4 (73.6gr) But there is a lot of room there to work with and this test was .1gr increments. My thought was due to the temp being in the mid 30's. That would leave a pretty wide margin for higher temps.

My question to you all. Where would you go from here?

Conditions were 35*F/28.51" Station press./76% RH Range 550 yds.
Yes shot #1 was very low on the paper so I moved it up 1 moa. The plotted spot should be accurate. would have liked to shoot this test at a longer range but it snowed up there last night so accessing the longer range was going to be problematic...

 

[waveslayer]

Looks like you need to shoot groups, you already habe your node 73-74 grains. That jump in velocity is interesting after 73.3... you need to shoot some groups. You could settle on 73.5 of that's the velocity you want. Then if it gets warm you have wiggle room

 

[steve123]

If it's calm out I look for when the horizontal tightens as well as the vertical so that'd put 5-6 in the fore front in my mind.

10 appears to be the scatter node. If I can't determine perfectly where the node is I'll take off 3% from the scatter node which is usually square in the node, if not satisfied with that I'll redo the test.

In big cartridge cases I like to do .2 or .3 grain ladders, it makes the nodes more obvious. In normal sized cases I usually do .1 grain increments.

That's a really good barrel and good shooting too!

 

[Bigwheels]

Thanks. This is the "fine tuning" ladder test. I found this node with the 1st ladder @ .3gr. The 1st test also showed a higher node but that one just wasn't stable enough. So now I'm going after this lower one. I just wasn't expecting to get one that appears so wide.

 

[Bigwheels]

Going to try some seating depth with 73.7gr & see what that turns up. Going to be colder though. Supposed to be 10* in the am after this storm blows through.

 

[Bigwheels]

Was able to get out & shoot the test today. Conditions were colder but I found the perfect spot wit no wind & no mirage.
Looks like .005" off the lands is going to be the ticket.