What is the minimum muzzle velocity of a Daisy Model 880 Air Gun with a single pump?

I found your question, interesting so I thought it might be fun to try it out.

I happen to own two Daisy model 880's in my collection. One is very old (It's one of the first models) and one that is much newer but not brand new.

I used Daisy Zinc plated Ultra Smooth 4.5 BB's for the test. These are made of steel airgun shot.

I actually was wondering if the BB would even leave the barrel with only one pump. I was afraid it would just land in the chronograph as it fell out of the barrel, But I proceeded anyway with 3 shots from each rifle.

First the OLD 880 was tested and here are the results with only one pump

1. 163.5 FPS

2. 174.1 FPS

3. 178.0 FPS

This gave me an average of 171.86 FPS for the old 880 rifle

Next I tried the newer model 880 with one pump.

1. 269.3 FPS

2. 263.4 FPS

3. 282.6 FPS

This gave me an average of 271.76 FPS for the newer model 880 rifle. A full 100 FPS difference. ( Time to rebuild the old 880 )

For the fun of it I pumped the newer 880 a full 10 pumps just to see the FPS and it fired at 641.6 FPS Daisy rates this rifle at 800 FPS with BB's. Makes me wonder what conditions they tested under.