After hearing that cold weather may cause errors with my prochrono, I purchased a light kit. I've been playing around with it.

I thought some might be interested in what I found with the new Graying Green Super K from Bear.

The arrows were Beman MFX 600 and 500 spine with 3, 4" feathers.

60" Super K -- 44#@26 (50#@28")
414 Grain Arrow Speed   165 -- GPP 9.41   
505 Grain Arrow Speed   154 -- GPP 11.48   

I've checked several of my bows. To give me a way to "rate" them in terms of ft/sec/pound of draw weight, I divided the chrony speed by the draw weight.  For this Super K I get 3.75 ft/sec/pound of draw weight.  This Super K is 2nd only to my Schafer which is 3.83. The Schafer has a 2# higher draw weight.

I have to say I was pleasantly surprised about this Super K!  I'm also surprised about the excellent performance of a 56" Cascade I just traded for!  That bow is only 44# at my draw length and is 3rd in my 15-bow (all recurves) ranking @ 3.73.

The difference in ft/sec. in the two arrows among the bows ranged from only 8 ft/sec to 16 ft./sec. Most were 9-10 ft/sec difference when adding nearly 100 grains to the arrow. You can see the Super K had a difference of 11 ft/sec.

As others have said about chronographing bows:

1. The first shot from a rested bow is always higher than the subsequent shots. I don't count the first shot (2-3 ft/sec faster). Then I average shots 2-4. Usually there is no difference or only 1 ft/sec between shots 2, 3 and 4.

2. If I don't feel my back muscles at full-draw I will be 1/4-1/2" underdrawn and chrono reading will reflect this with a slower speed.

I'm doing this for fun and to check a few things such as silencer impacts, glove vs. tab, the importance a solid anchor, etc. I have no intention of "judging" a bow brand by what I'm finding.

I'm going to do some momentum calculations (not KE) to help me lock in to the 600 or 500 MFX.

What did you find with warm and cold weather?

I'm going to check that as soon as it isn't raining.