New Creedmoor load test

[kilotanker22]

Assuming that the tool will measure CBTO where the bullet meets the diameter of the tool. I just assume that the Sierra has a longer surface at full diameter than the longer more slender Hornady bullet.

The Sierra shoots so damn well, I just want a higher BC for longer shots. I have recently acquired the use of a farm where I can stretch out to 1200 yards.

 

[kilotanker22]

I decided to reduce the starting load by 9% I will begin testing at 38 grains of H-4350 increasing by .5 grain increments. So I will test 38, 38.5 and 39 grains of H-4350 this afternoon. With the bullet at the lands. I am hoping to find velocity similar to what I have now while reducing barrel time by moving the bullet closer.

 

[kilotanker22]

So far velocity wise
38 grains Avg= 2541
38.5 grains Avg= 2560
39 grains Avg= 2591

All had single digits SD numbers. The 39 grain load had an extreme spread of only 8 FPS.

Letting the barrel cool for awhile before I shoot groups.

Seeing the velocity I am getting here. I plan to load 39.5 grains and 40 grains for the next range trip. Since my top velocity at 39 grains is 150 FPS slower than my previous load

 

[kilotanker22]

Coincidentally all of these loads showed vertical stringing at 100 yards. All groups were sub MOA, but where the groups opened were in elevation.

I am gonna guess that if I load. A little hotter that will tighten up.