Neil will be along to chastise me shortly (for not reading the rule book)...but I don't see why not. I think all you need are three shooters to 'register' targets. why would you use more than one field? Assuming, of course, that the field is regulation and the targets are properly set...
In addition, traipsing between traps at clubs with fields that are reasonably similar or where more than 4 fields are being used is a huge waste of time. It serves absolutely no practical purpose. If your fields are pretty much the same or people are going to shoot different banks of traps, shoot 100 per field and be done with it.
Five Points Conservation Club in Indianapolis, IN, only has one trap. We throw Big 50's once a month, 6 months out of the year, and only shoot singles at those. Look up the location and you'll see why we only have one trap field.
At the Kentucky State Shoot we shot all of our singles on preliminary days on 1 trap. There are clubs scattered all over the country that can not
have 4 traps for one reason or another and throw registered targets. Sign up and shoot!!!!!!!!!!!!
More than ever we, sometimes, need to look backward and remember where we came from.
At one time there were a lot of one and two trap clubs that the ATA was born. It seems to me that we have the opportunity to "increase" our ranks in the same way, with a deliberate and concerted effort to develope new and stronger relations between the ATA and the smaller clubs.