Every since I purchased my Crossman Optimus spring piston, air rifle my Crossman 1000 has sat in the corner. I don’t think that there is anything wrong with it but that it is a variable pump rifle. That means to get the same performance (actually less than) from the 1000 to the Optimus, it takes twelve pumps. I know that I am aging, but this wears you me as well as it takes a long time for a follow up shot.

I continue to collect pellet ballistic data, looking for that magic combination of energy between velocity and weight. The other day, I was thinking, I should do some work with the Crossman 1000 because it also shoots BBs. Maybe I can practice even cheaper? Maybe I can burn up those BBs I loaded on day one and haven’t shot since I went to pellets with the Optimus?

I am not going to bore you with more numbers. I find it interesting and maybe if you really want, e-mail me for the results. But, one of my going in theories was that BBs would not be accurate. As I was trying to measure velocities across that 1 1/2″ window, I was struggling. I shot probably 30 shots to get ten measurements. When you have to pump the rifle 12 times with increasing force, it really gets to be a chore.

The scope that comes with the rifle is cheap and barely useable. I do not recommend the Crossman 4×15 that you can purchase for $20. Since mine came with the rifle, I will use it for now until I get fed up with it. The point of that is that it is not easy (or clear) to see through it well. But, from what I could see, it looked like was shooting all over the place. Hence, why it took me so many shots to get measurements.

All of these shots were from a rest with 12 pumps at 10 yards. The ones in the red represent the first 5 shots whereas everything else happened afterwards. It is no wonder I struggled to get measurements with the chronograph.

I started out with a whole series of velocity/energy measurements with BBs and pumps just like I did with pellets. This time I went 3, 5, 7, 9 and 12 pumps. Skipping all of those other intervals saved my arms a lot of movement and I didn’t really care to get that much data. I am pretty sure the velocity curve follows the one that I previously calculated for pellets. The other thing that I did differently was measure the velocity at the target (10 yards). The reason I did that was because I am trying to determine how effective this rifle with BBs really for pest elimination.

I already know that 8 ft/lbs at the muzzle is lethal on pests. The last thing I want is an ineffective tool. After I got all of my measurements, the next thing that I wanted to determine was how accurate is this rifle with BBs anyway. So, I just started shooting at targets. At first, my groupings were pretty tight, then things started to go a little wonky.

By the time I got through my planned magazine, I was struggling to pump the rifle even on the first stroke. After I ran my magazine dry, I tried another test. I simply cocked the bolt and pulled the trigger. Low and behold, it fired. Then I did it again and it fired again. I did it a third time and it was just the thud of the spring.

So, it appears that twelve pumps puts more air in the chamber than is used to drive the BB. This is the cause of the increasing difficulty to charge the rifle after firing. I believe that it is also the cause of increasing inaccuracy. I really don’t know where the line is between expected results and chaos, but I would say five shots is a safe bet since that is where I got my best groups.

I am going to continue this test with other pumps groups. The reason being is that I am trying to determine if it is even worth training marksmanship with this rifle and BBs. Ideally, I would like to know this rifle well enough that I could say, this is where I train and this is where I could use it if need be. After all, an inaccurate rifle is pretty much useless. You don’t do anything for marksmanship or pest elimination and you might shoot something that is not intended.

End Your Programming Routine: The big drawback is the multiple pumps. I am hoping that my data says that 3 pumps is adequate. This would relegate the Crossman 1000 to mostly just target shooting, but it would be worth it for the practice. If the accuracy proves to be a problem, then it may relegate the rifle to the garage sale pile.