The 140 BT was beefed up for Silhouette shooters to knock over the Ram or which ever target was heavier better. Then the 120 was made by shortening the same 140 jacket and is heavier still than the 140. All are good. Just me but I would pick the Accubond over the BT for Elk but then I have never shot an Elk with a BT either. I am sure it would result in a dead Elk.

"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