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Hunting
Long Range Hunting & Shooting
7 saum unexpected velocity
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<blockquote data-quote="jabey9210" data-source="post: 638431" data-attributes="member: 24943"><p>Maybe the actual bc of the bullet is off a bit cause you can change the bc on jbm to get your correct trajectory also. I shoot a 7mm Wsm and get exactly 3000 fps out of a 27" tube with 180 berger vld's according to the chrono and with that my trajectory is right on with jbm I thought they were pretty hot loads but I'm on my 6th reload on this brass so they must not be too bad. But out of my 243 if I go with the chrono and jbm they are off so since I know the chrono is pretty accurate I change the bc and get the correct trajectory if I changed the fps it says I'm shooting about 200 fps faster than I actually am so either way as long as your trajectory is right on the numbers in jbm are just that and really don't matter as long as the trajectory lines up!!! I also agree with checking your extreme spread if you're having vertical issues!!</p></blockquote><p></p>
[QUOTE="jabey9210, post: 638431, member: 24943"] Maybe the actual bc of the bullet is off a bit cause you can change the bc on jbm to get your correct trajectory also. I shoot a 7mm Wsm and get exactly 3000 fps out of a 27" tube with 180 berger vld's according to the chrono and with that my trajectory is right on with jbm I thought they were pretty hot loads but I'm on my 6th reload on this brass so they must not be too bad. But out of my 243 if I go with the chrono and jbm they are off so since I know the chrono is pretty accurate I change the bc and get the correct trajectory if I changed the fps it says I'm shooting about 200 fps faster than I actually am so either way as long as your trajectory is right on the numbers in jbm are just that and really don't matter as long as the trajectory lines up!!! I also agree with checking your extreme spread if you're having vertical issues!! [/QUOTE]
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7 saum unexpected velocity
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