Originally Posted by mathman
My belief is that they use the same blank to make the 120 and 140 jackets.


This is my understanding and also what I have heard from various authorities. Wish I had a photo but the 120 BT looks just like you had trimmed a 140 BT jacket down from the nose end. So the 120 has a higher percentage of cupro-nickle to lead than the 140. Maybe some enterprising person will do the meltdown test and weigh the jackets, some one probably already has. I saw a comparison doing this in Handloader's Digest but don't believe both BTs were included, I'll try to find it.

Anyway if I ever whittle down my stock pile of Accubonds and Interbonds the BT will get a chance. Got them ready to go in 6mm & 6.5 so a 7mm trifecta would be a good way to go.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli