I have seen these distances very from 10 yds up to 55/60 yds so don't get upset when you get to a shoot and things don't match the last one you were at. Clubs often like to put their own spin on things which to me makes each club unique and memorable. Personally I have not participated in one (I shoot HFT Springer) but am planning on it this coming year. I shoot a TX200 springer which is slow to load. However after viewing the Pyramid Air Cup last year I noticed that the fastest loader did not always win. Often the slow and study guy who made every shot count often did better. If I have enough fun I'll upgrade my equipment to a Break Barrel such as a Weihrauch HW98 Air Rifle. Springers compete against only springers. Hope this helps. Maybe see you out there in 2019?
Is there a "standard" spacing between each target... for example how far away does one chicken have to be from another chicken to keep them from fighting?
The distances that Padd stated are for NRA air rifle silhouette which is an NRA discipline. We shoot approved NRA silhouette matches at our club based on NRA rules which can be found on the NRA website. The rules include range standards such as target spacing. I think the question original asked was regarding the speed shooting of silhouettes and is NOT an NRA discipline and uses different rules.
The two different kinds of matches should not be confused with each other.
Not sure if EBR follows the "standard " (that being NRA rules) but the rules state at least the width of another animal and no more than 3 widths - that is if I remember correctly when I read the rules 2 months ago.