Chrono check.
Posted: Mon May 07, 2018 9:33 pm
Does anyone ever try a chrono check in hot weather? My Prosport has hardly been touched since the last strip down in October last year. It has a TbT guide fitted with 2 slim AA washers. It settled nicely at about 775 fps with AA Fields in 4.52, Healthy but not too close to the limit, somewhere around 11.3 ftlbs.
I did a quick check tonight and got a string between 789 and 794 fps with one shot peaking at 797 fps, far too close! I removed both washers and it dropped to high 750s, one washer back in and it was at 778 to 780, thats ok and it feels good. Interesting that one washer dropped the fps by 10 to 15 fps but the second one dropped it by a further 20 fps. That suggests to me that maybe the PS would benefit from a slightly stiffer spring but less preload. I'll repeat the test midweek when the temperatures have dropped a bit, if the fps reduces then I'll know that I need to add a washer for winter and remove one in summer!
I did a quick check tonight and got a string between 789 and 794 fps with one shot peaking at 797 fps, far too close! I removed both washers and it dropped to high 750s, one washer back in and it was at 778 to 780, thats ok and it feels good. Interesting that one washer dropped the fps by 10 to 15 fps but the second one dropped it by a further 20 fps. That suggests to me that maybe the PS would benefit from a slightly stiffer spring but less preload. I'll repeat the test midweek when the temperatures have dropped a bit, if the fps reduces then I'll know that I need to add a washer for winter and remove one in summer!