berettaprofessor,
Interesting results, usually with magnum primers you get better ignition which should typically result in lower SD. So maybe they are not reacting like magnums? I wish you could test the 450s. compare the results.
The Load you used was it originally worked with the CCI 400s?
I usually work up a load with different primers because I have found that I dont always get the same barrel harmonics with same powder charge and different primers.
Interesting results, usually with magnum primers you get better ignition which should typically result in lower SD. So maybe they are not reacting like magnums? I wish you could test the 450s. compare the results.
The Load you used was it originally worked with the CCI 400s?
I usually work up a load with different primers because I have found that I dont always get the same barrel harmonics with same powder charge and different primers.