any idea what is the BC of jsb king heavies MK II in.25 cal? Hawke BRC shows me 0.0615 which is strange to me. MK I have 0.043 BC.
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.25 jsb king heavies mk II BC value
- Thread starter Gmg
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I picked up the #.0530 from a post. I plugged that in and shooting at 880 fps it appears to work. I shot 300 of the original MK1's, and when I switched to the 2's I saw no noticeable difference
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It would have been a search on the yellow or possibly another. I think yrrah posted it. I'm using 2.35" scope height and 880 fps for a .25 Cricket med rings. I'm not much on paper prefer something 3D I shoot plastic caps from milk bottles or other drinks that I hang on rebar driven into the ground I'm hitting equally with both 1's and 2's
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Never really like the MKI's had feeding issues. So its the 25 kings or the MKII's for my Tactic. My BC for the MKII's is .038 which was calculated by Strelok Pro which different POI and temperature drops.
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What is Your drop at 880 fps and 109 yards ? I have 38 cm on 102 meters with mkii, mv is around 269 meters per sec. Hawke brc calculator spit bc of 0,0615......
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I switched screen to metric conversion, it came up with 268 mps 5.97 scope height and 18m first zero. 43m for the second. At 90 meters is 30.81 100m 43.34 110m 58.22 120m 75.62 with the drops. After my last post another shooter shooting at 82-85 yds was hitting starlings with a 3/4 success rate on 18X with a 2 dot holdover I never move the turrets and usually dial up a power to correspond to the range yardage.
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hmm, strange. I have scope height 7.8 cm, zero at 50 meters/55 y.
Have to measure it again.
Have to measure it again.
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I'm using the UTG med mounts, the ones with the lever clamp. I measured with my 99 cent Harbor Freight blue plastic caliper. I originally sighted gun in at 20 yds. Chairgun the blue screen on a computer put the second zero at 46 yards. Shooting off the tailgate sitting on a step ladder using a Caldwell bag it blasts an unsorted 1" or so group at the second zero. Getting those two right I assumed the rest of the chart to be correct. I had the same set up and 6.5x20 Hawke scope on the .22 and that shot at 20 and 45 yards. I had a funny one a few weeks back I guesstimated the range wrong, picked the wrong power magnification yet made two nice near 100 yd shots. in that case two wrongs made a right and the saying even a busted clock is right two times a day comes to mind. I hope you continue to post, and I'll try and do a pizza box drop shoot on a windless day. A funny thing I experienced was the difference between the 25.39 and the 33.95 while shooting off a friends deck at 73 yds shooting at the bottom of the Christmas balls, and at the top with the heavier pellets both were hitting.
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I contacted JSB yesterday and they told me, that it is not possible to determine universal BC. It varies because of: barrel you are using, temp, humidity, MV, pressure, even pellet series. So one should calculate BC himself.
But he confirmed, that due to the differencies beetwen MKI and MKII, there should be different BC too.
But he confirmed, that due to the differencies beetwen MKI and MKII, there should be different BC too.
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