My US Model of 1917 Eddystone 30-06 had been shooting high with all previously developed loads so I thought more load development was in order. I suspect since the condition of my bore has improved greatly, my velocity has increased.
Since my previously loaded cartridges weren't reliable, I pulled all the bullets with loads using IMR 4064. Ive load developed with IMR 4064 extensively and wanted to go with something I figured I could guess where my POI height would be... since I need the load to correlate to the set sight graduations.
So I loaded up 10 Audette Ladder Test cartridges and stored them outside overnight so their temperature would be sub-zero, (for use during winter.)
Here is a short video I made of that day's test.
Here is a pic of the test results.
After 6 shots I knew the load was 46.9grains of powder, so I stopped, (waste not whatnot.)
I wanted to have a perfectly clean bore, (cold-bore,) to test the new load, this way if there was a cold-bore deviation I would know how much.
This time I didn't cool the cartridges before shooting, it was going to be warm anyway and I wanted to see if accuracy was going to go south with the warmer temps.
Here is another video of today's group.
Here is a pic of that group.
Which happens to be the smallest 300 yard group I've ever shot with any rifle, scoped or not.
That is nine shots and I've found a load that shoots wonderfully. The Audette Ladder Test is the most economical way to load develop, that I know of. If you haven't tried it, you should give it some serious thought.
I rarely shoot more than 10 shots during load development.