The best thing to do, is look at the raw velocity readings from your shot group and take out the highest and lowest readings (the outliers) of 11. If we look at the complete picture of what’s going on, you can see that the high ES is bloating the standard deviation and the average velocity. Grouping somewhat affected by magnetospeed changing barrel harmonics. You can use the ES reading in conjunction with the SD reading to validate how accurate your average velocity is.Įxample Lets look at the raw data from the American Eagle Remington Target 10 shot group 40m. A high spread could potential be the difference of a hit and a miss at long distance. If you extreme spread is low, the “fliers” may not be noticeable on paper or may be minimal. This number shows the how far off in velocity the infamous “fliers” are. If you do your part as a shooter, this should translate into tighter groups on paper. The lower the standard deviation, the more consistent the velocity. This is a measure of how consistent your ammo is performing. This is a very helpful number to be used in the “Velocity” field of your ballistic calculators. This is as the name suggests, the average velocity of the string of shots fired over the chronograph. They are Average Velocity, Standard Deviation, and Extreme Spread. There are a few #’s you want to pay attention to in order to understand the whole story of what is going on with your ammo. Groups affected slightly by magnetospeed changing barrel harmonics. Making Sense of the #s 10 Shot Group Eley Club 40 Meters. Here is the summarized data from the 10 shot groups (not removing outlier readings). We tested Remington Thunderbolt, Remington Target (by Eley), American Eagle 40gr SP, CCI Subsonic, and finally Eley Club. This will give us enough of a sample to get a good snap shot of what the ammo is capable of. For this test I used 2 – ten shot groups for each ammo.
#Extreme velocity of 22 subsonic rounds how to
Then I humbly asked how to set it up, then how to make sense of it all.īy using the chronograph, we are able to look at data the greatly reduces “user error input”. He offered to let me use his Magnetospeed Chronograph to test my ammo. He was at the range testing ammo for his. I was at the local range and bumped into Andrew from the CRPS. This is how most shooters determine which ammo to shoot. In order to try and isolate as much “user error” as possible, I was going to then compare the groups of the same ammo to draw a conclusion. I was planning on writing this article solely based off shooting multiple 5 shot groups of various grades of ammo. 5 Shot group with Remington Target 40 Meters Each one of my guns preferred a different brand/model. I have run it in semis and in bolt actions. I’ve tried everything from “plinking” grade to “target” grade all the way up to “match” grade. In the short time I have been shooting, I have shot over 10,000+ rounds of. Therefore we must sample a little bit of everything in order to find what works best in our rifles. Unlike its centrefire cousins, our rimfire rifles are subject to a life of being fed only factory ammo. Ammo selection for your “Production” or “Open” division rifle can be a bit of a grind.
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