Hi from Canada,
My McCalmont family is from Islandmagee & I have found the following in my research. I hope it is of some use to you.
Andrew Ross of Mullaghbouy, a bachelor labourer, son of John Ross a stone mason, married Jane McCammont (sp) on 6 August 1863 at 1st Presbyterian Church, Islandmagee.
Samuel Ross of Islandmagee, a bachelor labourer, son of Samuel Ross a farmer, married Isabella McCalmont on 28 October 1874 at 2nd Presbyterian Church, Islandmagee.
Andrew Ross also witnessed 1866 marriage at United Church, Islandmagee & was also present at death of John McCalmont age 90 (most likely father of above Jane) in 1876.
John Ross, a widower farmer of Ballycronan, son of Samuel Ross, married Jane McCalmont spinster of Mullaghbouy, Islandmagee, on 18 October 1884 at Ballycarry Presbyterian Church.
A John Ross witnessed 1908 Islandmagee marriage.
James Ross McCalmont born 16 October 1887 moved to Philadelphia, U.S.A.
I have no documentation on this.
Alexander Ross married Mary Anne McCalmont on 15 October 1868 as per Emerald Ancestors.
If you would like scans of the documents I have send me your e-mail address by personal message.
Good hunting.
J.A.M.