I purchased a set of springs to compare against CCM springs. I just compared the CCM Hammer spring versus the SLPS Hammer spring.
Marker: Jeff Orr V3 Pump
Valve: Palmers LT (the low pressure one)
Valve Spring: Palmers LT valve spring
Hammer: WGP midblock
IVG: 1 turn in from flush
CCM Hammer Spring: 272, 269, 269, 274, 271
SLPS Hammer Spring: 233, 227, 240, 238, 235
the SLPS hammer spring is slightly thinner in diameter, about 1 mm shorter, and has more coils than the CCM hammer spring.