it is a bit of a test area Steve and if it were a windy lane (i have not been to Weston park) then yes putting a 15 ml kill out furhter in our lane 1 is going to take marks off all at 25+ yards.
Our 1 inch kills at gp 3 last year proved that. Those under 30 yards were hit by nearly all while those at 30 + in the wind took marks off shooters, but were more than hitable.
It all comes back down to good course design (which Tondu was not perfect on but I learnt through listening again)
I had no trouble grouping sub 15 ml at 55yards Saturday in no wind With big mikes wlater and can do the same with the ev2, even the Njr when there is no wind.
A 15 ml kill (on x32) starts to look small at 25 yards and for me 30 yards is about, for now, as far as i think it is a hitable 15ml target, most of the time
Thinking about, i will take your challenge up and set two 15 millks up on our lane 1 saturday. One i will put at 25, the 15?