Thanks BFR!
That is very strange. If something was up with the release's jaws then I don't think the groups would be tight as you should get strange releases which would show up as more open groups or the occasional unexplained flyer but that is obviously not the case
The only other thing I can think of is to buy a third release and see which of the other two is matches

PS this is why I still shoot with fingers

I have just started shooting again after several years of being unable due to shoulder problems. In the interim I have been doing some BR shooting and when I came back to archery about 6 weeks ago,I was quite surprised to see how badly I shot with straight fingers. That is the way I used to shoot and never had to pay for the beer
The release I use now has helped a lot but I have noticed that as I lengthened the release(tuning it) I found my arrows heading off into Right field. As I am not really consistant with my groups and technique I am not worrying about that yet. derf

I have a friend coming over with his bow and a different release. We are going to shoot all three from both of our bows and see what happens. I will keep you posted about thee results.