Haydel's H-81 Canada Honker works well on Greylags - I have used one throughout this season and it has served me well. I also have a Haydels MSG 96 on the lanyard and use that on Pinkfeet - it is deadlyon Pinks, but the pitch is a bit to high on the MSG96 for Greys.
DJ Illinois River Valley Calls make an excellent greylag call,at www.djcalls.com Look under speciality calls. they also make a call for pinks, and have a sound file so you can hear them. I got mine from Kevin Wilcox at www.tidepool.co.uk Hope this helps !
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