BC I just got finished trying the sc method. I did ten test... This is what I got...

2.954
2.957
2.974
2.957
2.959
2.959
3.007
2.955
2.958
2.957

My gauge I made was loose enough for me to pull the bullet out by hand. A few times the bullet would be pulled out by the rifeling. I disregarded those mesurements....

I might try again but this time make the gauge a little tighter. I was affraid that it would push the bullet into the rifling to hard and give me a false reading. That is why i made the gauge a little losser...