RE: Single caliper or dual caliper release?
I have found that for me personally that a single is more consistant.
The reason is I can lay the release of a single style right next to my face and it isn't affected but with a double,the caliper hits my face and isn't as consistant as a single.
I REALLY like my Short & Sweet II by Tru Ball. Perfect for a loop when shot right off the caliper.(remove rope)