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what speed cannot be exceeded and stay under 20fpe limit with given wt pellets

June 19 2012 at 6:58 PM
  (Login lhd)
YF

There has been a little confusion lately regarding how fast is too fast for FT with certain weight pellets, so here's a little info I worked up regarding the highest individual velocity for common pellets:


For the common .177 pellets:

10.5gr Crosman Premiers= 926fps is 19.997 fpe (footpounds/sec)

8.4 gr JSB = 1035fps 19.985 fpe

7.9 gr Crosman or JSB = 1067fps = 19.976


For 5mm pellets:

14.3 Crosman Premier = 797fps = 19.97 fpe

13.6 JSB = 813fps = 19.965 fpe



For .22 cal pellets


14.3 Crosman or JSB = 793fps = 19.97 fpe

15.9 JSB = 751 fps = 19.97 fpe

18.1 JSB = 705fps = 19.98 fpe

Bear in mind that the AVERAGE speed for any combo should likely be a minimum of around 2% lower in order to have a reasonable chance that none of your shots will be "over" with a test of five shots.


 
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