I use extractor doubles in the field. Even if I'm not reloading the hulls, I pack them out. I police up my hulls ejected from the Model 37 and Model 51 also. As a Boy Scout I was taught - As sportsmen, we are supposed to be conservationists - I think that this means that we don't leave our trash messing up the view for the next people who are there. Spent hulls are trash.
My two cents, anyway.
Regards
GKT
Texas Declaration of Independence 1836 -The Indictment against the dictatorship, Para.16:"It has demanded us to deliver up our arms, which are essential to our defence, the rightful property of freemen, and formidable only to tyrannical governments."
| 
