Ballistics by the inch

Limits of the project.

Got a note from “Neal” this morning:

I’m questioning the information on the website for the two Cimarron Colt clones in the two barrel lengths in the Corbon 200 gr. JHP +P column. It looks to me that you have two of the entries swapped. The 1094 and the 1227.

And here’s what I told him:

Well, I checked the data sheets, and it shows very clearly that the data points are for the correct guns. Those tests were conducted early in the day (10:30 in the morning), so I can’t imagine that we were tired or messed up getting things written down correctly, and the info is consistent with regards to the other ammos (or, rather, I should say the other ammos are consistent with one another).

So, it’s hard to say. It could have just been a fluke with those three rounds. This is the downside of only shooting three rounds – ideally, you’d do ten or more, to make sure you got enough data points to cover any glitches, but our funding and time wouldn’t allow doing that for all the ammo tested.

We will be doing some other testing in the future, and one of our guys owns that Peacemaker, so we should be able to run some 200gr. Corbon through it to see if we come up with some other data.

But thanks again for bringing it to my attention – it makes for an instructive point for our blog, as well.

It is a good point – there are real limits in what our data shows. Overall, I think you can get a pretty good sense of what is happening, but for any given data point there is some statistical doubt. More testing would give a greater level of confidence, but requires a greater level of effort and expenditure.

Jim Downey

August 14, 2009 - Posted by | .45 Colt, Data, Discussion.

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