sumpnz
Member
OK, that sounds a bit more reasonable, though I would still expect more than 100fps difference, probably more like 150-200fps. As I understand it, with these high intensity overbore cartridges you should expect (rule of thumb) about 30-40fps difference for each 1" of change in barrel length. At a 5.5" difference that would indicate 165-220fps as the expected difference.
What I'd like to see is some chrono data for the 108, and 123 grain bullets from the 18.5" and 24" tubes from the same day. Say 5-10 shot averages, with standard deviation and 100 yard group sizes if possible.
Edit to add: I'd also like to see the 6.8SPC tested alongside the 6.5 Grendel so that we can do an apples to apples comparison without trying to account for changes in temperature, humidity, and pressure.
What I'd like to see is some chrono data for the 108, and 123 grain bullets from the 18.5" and 24" tubes from the same day. Say 5-10 shot averages, with standard deviation and 100 yard group sizes if possible.
Edit to add: I'd also like to see the 6.8SPC tested alongside the 6.5 Grendel so that we can do an apples to apples comparison without trying to account for changes in temperature, humidity, and pressure.