ive had a chrony F-1 for years that has preformed well but is hard to see the numbers at times.so i was at scheels on wednesday and picked up a beta unit and got out yestaerday and did some testing with it and the 300wm...with the old F-1,71g RL-22,CCI250,nosler brass and a hornady 208g BTHP at 40deg i get 2910 to 2930fps,(checked book for old data)with the beta i was getting 2864 to 2884fps. that got me wondering which of the two is closer to actual FPS so i came home loaded up 25 rounds and went back out with both units screwed back to back to a 4"x8" block of wood i use to set my chrony on. i set up one of my target stands to keep the sun off of the sensors as it would have caused a lot of errors.
this was in the morning about 730 at about 25deg..
this was later about 1130 and about 35-40deg with chronys back to back...its been cold here...thats about an 1" of snow on the ground and has been here for 5 or 6 days now,normally melts off the same day..
this is 70.5g RL-22...this is the load i shoot in the summer and on the F-1 produces just over 2900FPS at 90+deg...
i shot 25 rounds over both chronys screwed to the block and they were all pretty close as far as FPS from each chrony...last 5 rounds were...
F-1........beta...
1-2913...1-2867
2-2914...2-2874
3-2911...3-2864
4-2921...4-2884
5-2911...5-2872
im going out later if the wind dies off(or tomorrow morning) to shoot 1760yds and ive got drops from G-7 ballistics,JBM ballistics and shooter using the averages from both chronys so well see which is closer to actual FPS...i use the shooter app mostly but but its off quite a bit from what the other 2 programs say so we will see.
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