Sounds like they will kill out a little poorer (weight wise) than I'm used to. But if I know to take them on a little heavier before drawing, that should be OK.
Iv usually got a lot of good foggage in the autumn at home, so could bring these lambs back, if needed, to get them away fat. Was thinking to let the lambs run to weaning, then just take a big draw of everything fat, bringing home what's left to push on.
Since starting to record tag numbers I've been surprised at the variation in killing out % in lambs, but pure EC will kill at 18 when 40-42 live up to 21 if killed at 46-47 live. Our average over the last few years has been between 19 to 20 kg.