Imr 3031

[spitballer]

100 yd target, 3-shot groups from left to right with IMR 3031 and 55 grain HP dogtown bullets. Charge from left to right: 21.6, 22.1, 22.6, and 23.1 grains.

My esteemed colleagues at the High Road have impressed upon me that vertical spread is more important than horizontal spread, therefore I would draw attention to the right half of the target where I used 22.6 and 23.1 grains. It would seem that my next batch would be somewhere in between these two charges.

I would also note that the two groups on the right follow a pattern of two shots in the middle and one to the right, in that order (shot next to the number 8 is part of third group, shot on very edge of target is part of fourth).

Question: would optimum load be closer to third or fourth group?

 

[bluetopper]

To me, looks like all loadings are within the margin of human error at the bench, especially when just 3 shots from each loading are looked at.

A ten shot group from each loading and you can tell a whole lot more what each load is doing.....just my take.

 

[spitballer]

Line-of-sight zero (looking through the barrel) is very close to dead center, although about two inches high because I'm zeroed at 200 yds, not 100.

The last group seems to start pulling to the right. Would this indicate too much pressure?