Crosman New 1701p

[weevil]

I'd answer that question with a qualified yes.

I've found it takes no small amount of trial-and-error monkeying to find the right amount of cushioning/restricting of the hammer-blow against the valve-stem; often involving assembling, testing, disassembling, adding or subtracting o-rings, retesting, and so on. But when/if you find the sweet spot, I've seen disproportional increases in shot-count at the expense of 10-15% velocity.

Also, you'd have to consider disproportional increase in shot count a "smooth out" of the shot curve. Example- if you accept a (say) 30 FPS extreme spread, and your shot count increases by 40% while remaining within a 30 FPS extreme spread, at only a 10-15% cost in velocity, I'd say that qualifies as a smooth-out of the shot curve. And though not necessarily "the best I ever had", to quote Roger Daltrey, "I'd call that a bargain".

By the way, I've found snug-(outside diameter)fitting rubber WASHERS work and hold up better than o-rings for B Staley tunes.

Flashbacks of sanding down orings for me!

 

[Struckat]

The 1720 TP was too hot, so I drilled my TP, I forget the numbers, but halfway between the 1701 and 1720.

That brought velocity up to 580ish with 7.4 wad cutters. Perfect.

I see tha 1720 is back up on Crosman’s website.
Out of stock of course.

 

[fderry]

I added some Hill and Magnum parts to get more air tube volume and flow plus a B-Staley mod. Also restricted the air pressure that I tested at. More adjustment to come but I am happy with progress so far. The following is where the 1701 is today:

Crosman 1701
Crosman LW 12” Barrel
Hill High Volume Gauge Port
Hill Pistol Valve Cap
Magnum Airpower Custom Air Fill Adapter
DonnyFL 1/2”x20 Adapter
Rowan Engineering Air Stripper
B-Staley Mod (2) 3/4”x1/2”x1/8” rubber washers (thanks AirNGasman for the suggestion!)
Hammer stroke - 2 turns from full CCW
Hammer Spring - 3 turns from CCW

Pellet Benjamin 10.5gr
Altitude 7126ft
Temperature 58*
Barometer 23.30inHg
Shots 30
Spread 28fps
Average 588fps
Pressure 2600psi - 1600psi

573,FPS 7.7,FT Lbs
569,FPS 7.6,FT Lbs
578,FPS 7.8,FT Lbs
578,FPS 7.8,FT Lbs
583,FPS 7.9,FT Lbs
583,FPS 7.9,FT Lbs
589,FPS 8.1,FT Lbs
588,FPS 8.1,FT Lbs
592,FPS 8.2,FT Lbs
589,FPS 8.1,FT Lbs
589,FPS 8.1,FT Lbs
590,FPS 8.1,FT Lbs
594,FPS 8.2,FT Lbs
595,FPS 8.3,FT Lbs
595,FPS 8.3,FT Lbs
595,FPS 8.3,FT Lbs
597,FPS 8.3,FT Lbs
595,FPS 8.3,FT Lbs
595,FPS 8.3,FT Lbs
596,FPS 8.3,FT Lbs
590,FPS 8.1,FT Lbs
589,FPS 8.1,FT Lbs
592,FPS 8.2,FT Lbs
590,FPS 8.1,FT Lbs
590,FPS 8.1,FT Lbs
589,FPS 8.1,FT Lbs
587,FPS 8.0,FT Lbs
585,FPS 8.0,FT Lbs
581,FPS 7.9,FT Lbs
578,FPS 7.8,FT Lbs