Crosman 160 tuning

[jirushi]

Hi John,
Wowsers, 30 shots on 1 powerlet!
At what power is that? Did you determine shot count by pellet drop, or did you do a shot string, if I may ask?
I think that 50 shots at 10 ft/lbs is quite good. 160-166 m/s; 6 m/s spread, so that's about 20 ft/s.
I think on a hot day, velocity would be 10 m/s higher, but that's a rough guess.
A shot count of 20 wasn't good, for sure. I think the valve spring was way too weak.
But I often read that their normal shot count is 30 with two capsules. That will be around 11-12 ft/lbs.

[Josie & John]

Hi John,
Wowsers, 30 shots on 1 powerlet!
At what power is that? Did you determine shot count by pellet drop, or did you do a shot string, if I may ask?
I think that 50 shots at 10 ft/lbs is quite good. 160-166 m/s; 6 m/s spread, so that's about 20 ft/s.
I think on a hot day, velocity would be 10 m/s higher, but that's a rough guess.
A shot count of 20 wasn't good, for sure. I think the valve spring was way too weak.
But I often read that their normal shot count is 30 with two capsules. That will be around 11-12 ft/lbs.

Hi Louis,

The rifle fired more than 30 shots - probably nearer 40 but the last 10 or so were audibly lower powered and landed under the tin I had placed out as a target at 25 yards. I didn't have a chrono with me as it was a 'fun' session!

Kind regards,

John

[jirushi]

Thank you John.
I understand.
I'm a bit of a shot string geek; I stop counting shots when I think velocity drops too much.
If I would count whilst plinking, the number would be higher. A few cm's drop on an empty beer can "don't matter"!
Can't wait to do try the S331 peep sight outdoors. A bit chilly for CO2, but a sunny October weekend would be just right.

[--ped--]

that's a good result Louis

[ratbuster2240]

I can picture you with your white tunic and shot string graphs and equations like a mad scientist. 50 consistent shots is very good for any co2 rifle, I've never thought to play around with hammer weights for adjusting power and economy.

[MrGreengrass]

Nice job on a very nice gun.

[Geezer]

20 shots is crazy low. I get more than that on a 180, unmodified.