Benjamin 397 velocity

[Wlm]

Had seen a discussion on the velocity of a 397 at various pumps, these are four shot averages in .177 using 7.9 crosman premier hollow point

2 pumps 432 fps

4 pumps 561 fps

6 pumps 631 fps

8 pumps 684 fps

10 pumps 724 fpf.

this was done in my basement at about 60 degrees f, chrono was a FX wireless.

 

[Matt247365]

The original external power adjuster

Thanks for sharing the info

 

[Wlm]

got a 317 in 1969 or 70, third hand from my cousin, Dad paid five bucks for it. ran thousands of pellets through it. Could light kitchen matches with it at 10 steps back in the day,

Now I'm teaching my grandson to shoot with that same gun.

 

[Matt247365]

That must be a lot of fun for both of you!

How old is he?

 

[Centurion1]

How are you pumping the 397 to 10? mine is almost cracking in half at 8. I recently re-sealed it and it's a bear.

 

[Wlm]

He is seven.

 

[Wlm]

It's a pretty new gun, probably only five hundred shots. It is a little tough.

 

[springer]

got a 317 in 1969 or 70, third hand from my cousin, Dad paid five bucks for it. ran thousands of pellets through it. Could light kitchen matches with it at 10 steps back in the day,

Now I'm teaching my grandson to shoot with that same gun.

Love my 317. Over sixty years old, pumps smoothly, holds air indefinitely and accurate. 

 

[Centurion1]

The 317 is a sweetheart, way easier to pump than the 397. Re-sealed my 50's version a couple years ago, shoots dead on. These tootsie roll guns are getting harder to find, at one time I had the whole line of them, kept the 317 because it shot the best.

 

[Beezer]

The number of pumps you give those Benjamins and Sheridans depend on the altitude you live at. Here in Montana, at close to 4000 feet elevation, you need more pumps that at sea level. And springers don't wok as well here as at sea level, which is why I am strictly a PCP fan when it comes to airguns.

Don't remember the exact velocity, but my Benjamin Sheridan Blue Streak .20 makes 15 FPE with heavy pellets. The Bemjamins are rated at around 14 FPE, and the pellet weight mainly determines the velocity that can be attained.

It takes around 15 pumps to get to maximum velocity at my altitude.

 

[Centurion1]

Good info.