That's not right. If he was using your rifle, under the estate rifle clause, then it's your conditions that apply. The fact that your guest had a closed cert is totally irrelevant. He could have used your 308..
I had this when I took my FEO out. One of my farms is signed off for 6.5 calibre and I sometimes use my 308 in there because I can (open ticket) but his ticket was closed so for him to shoot with me, using my rifle, I had to take the 6.5 instead.