Tag: 10 pumps

Bonus! I know that I said only one more in this line but I wanted to know something else while I started testing. My son has a Crossman 760 that I was curious how it compared to what I was doing.

The 760 is to prototypical first air rifle. It is affordable and ubiquitous. Most people I knew had one growing up. It can fire BBs or pellets and pumps from 1 to 10 pumps for variable power. Think of it as a value proposition, it is the most bang for the buck.

As all youth’s air rifles do, this particular one has a history. My wife and son bought it at an auction for the private school my kids were attending years ago. They paid probably double what it was worth but they won. My son was very excited at the time. However, it has mostly sat in the corner since the initial outing at the range. Here is the data that I found.

I was surprised to see that the 760 is significantly less powerful than the 1000. This was a new pellet, the Crossman 7.4 grain wadcutter, ten pumps each measuring the muzzle velocity. The data for the 1000 is part of the new data set I am doing in my number of pumps vs. velocity analysis coming next week.

The boxes are long gone. I really don’t know what the published velocity is supposed to be. According to today’s literature the velocity is 350-700 fps for the 760 and 750-1000 fps for the 1000. Those numbers are going to be subject to the weight of the pellet as you have seen from my previous data.

I actually have one more BB gun to look at which I will do in a couple weeks. I haven’t done any testing with BBs but since I was checking the catalog of performance, I was curious. I will talk all about that then.

End Your Programming Routine: I have to say, the 760 is much easier to pump than the 1000. I have a feeling that the longer forearm on the 1000 is an indicator that the air chamber is bigger, hence how to get more velocity. I am much preferring my break barrel spring air rifle to pumping 10 times to get similar velocity. But, for a kid this is a fantasy come true.

I promise that this topic line is not going to go on forever. Right now, I am am having too much fun and still have too many questions. This week, I am comparing results from Crossman Optimus and the Crossman 1000 using the 7.54grain Hunter pellet. To date, all of my work has been with the Optimus because it is just a better tool. The 10 pump BB/pellet rifle (1000) is a pain in the butt to shoot multiple times.

That being said, I am going to do a pump/velocity test in the future. I want to know if it is really worth pumping 10 times or not because it 5 pumps is almost the same, then I will be more willing to shoot it more consistently. I already know that the point of impact changes with less pumps. This implies a velocity change, but I want to know definitively.

For the record, the Optimus is on the left and the 1000 is on the right of this picture. I wanted to compare as closely as possible so I used the same pellet and the 1000 was pumped to the maximum 10 pumps. The data is below.

The Optimus data is the same data from a couple weeks ago. The 1000 data is all new. I suppose the thing that struck me was that there was not much velocity change over 30 feet. So, I did some comparative analysis below. I think that it all makes sense from what I expected.

For fun, I checked a couple other things. What happens if it is over pumped? With 12 pumps at 30′ I got 727, 651 and 771 fps. It looks like the data is all over the place and I didn’t do enough for proper statistical analysis. Maybe there is an overpressure valve? I don’t know and I am not really going to pursue more, I was curious what happened.

Finally, I changed pellets from the Hunter to the Magnum Energy @ 30′ 712, 711, 726 fps. I think those results were the same that I observed in the Optimus. So, that data seems to make sense.

End Your Programming Routine: The truth be told was that I purchased the Optimus because the 1000 was such a pain to shoot repeatedly. All that being said, the Hunter pellet out of the 1000 is potent enough to dispatch cat sized vermin at eight pumps in one shot. My biggest fear was needing a follow-up shot to finish the job and spending 30 seconds reloading. Let us see where the data leads.