Hi Shane
Most units had their own numbering sequence. So there will be hundreds of other 2755s.
There are hardly any records of rank and file Volunteers. Only those for men who were embodied (made full-time) and volunteered for service in the Boer War; or to allow a Regular battalion to be sent to South Africa, appear to have survived. These should be on Findmypast.
If all he did was go one evening a week with a two week summer camp, and the odd weekend away, the chances of finding anything on him are extremely small. If he later re-enlisted for WW1 the standard Attestation Form has a box for declaring any previous military service. Those that survived a fire during WW2 are on Ancestry. But if he received a long service medal during Edward VII reign he may have been too old for WW1.
One exception would be if he was on the permanent staff of the Volunteers. In this case you should be able to find him described thus in census and/or on a BMD certificate. The permanent staff were almost all discharged Regulars. So again FindMyPast is the place to look. If he is only listed as a civilian you can assume he was a part-timer. But it is always worth contacting his local Record Office as a local historian may have produced a booklet.
From Wikipedia -
Artillery Volunteers
In 1860, as the British government feared invasion from the continent, the Secretary at War recommended the formation of Volunteer Artillery Corps to bolster Britain's coastal defences. The 1st Yorkshire (West Riding) Artillery Volunteer Corps was raised at Leeds on 2 August and the 2nd Yorkshire (West Riding) Artillery Volunteer Corps at Bradford on 10 October. They began as Coastal Artillery with 32 pounder guns. In 1886, they became Position Artillery with 40 pounder RBL guns. By 1871, the 1st had grown to eight batteries and the 2nd had become the 1st Admin Brigade, Yorkshire (West Riding) Artillery Volunteers, containing five Yorkshire (West Riding) Artillery Volunteer Corps, numbered the 2nd, 5th, 6th, 7th and 8th. By 1880, a number of these Corps had been disbanded or absorbed and the Bradford Brigade became the 2nd Yorkshire (West Riding) Artillery Volunteers.
Various reforms from 1889 resulted in the units being renamed as 1st and 2nd West Riding of Yorkshire Artillery Volunteers, then the 1st and 2nd West Riding of Yorkshire Volunteer Artillery. In 1898, they became the 1st and 2nd West Riding of Yorkshire Royal Garrison Artillery (Volunteers) and were equipped with 4.7-inch QF guns drawn by steam tractors.
http://en.wikipedia.org/wiki/RBL_40_pounder_Armstrong_gunhttp://en.wikipedia.org/wiki/QF_4.7_inch_Gun_Mk_I%E2%80%93IVKen
