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Most purpose built sniper rifles now-a-days are still bolt action rifles
In reality, there are several semi-auto weapons being used by law enforcement/military forces today. Sniper Central has a good list of what country is using what weapon
http://www.snipercentral.com/worldrifles.htm.
Aside from Sniper Central, Sniper Country
http://www.snipercountry.com has some good information/articles, some of which have been written by those practicing the craft. Sniper's Paradise -
http://www.snipersparadise.com/index_hq.htm also has some good generalized information.
My experience (No, I am not an operator, just someone who grew up with the concept of the long shop) shows that weapons built on the Remington 700 bolt action seem to be preffered amongst those that are able to choose their own system.
On one of the above sites, I remember reading a couple of entries from a gentleman who was part of a two-man sniper team that was assigned to a Mechanized Infantry unit. He detailed one training exercise where he and his partner were left in a "rear-guard" position to serve firstly as "eyes" for the approaching enemy column. They were also given the secondary task of removing targets of opportunity that were exposed (senior officers riding in open hatches, etc.) His experiences gave me a bunch of interesting modelling ideas.
One final burst of diarhea from the mouth: Someone mentioned that a sniper didn't have access to a "lot of firepower". I'd disagree: In the hands of someone trained to do so, a bolt action rifle (many of which have been modified to accept the M14 mags, it is possible to still to prove oneself as a threat, despite the lack of a semi/full auto weapon. Gordan and Shugart, both posthumously awarded the Medal of Honor, are examples of what a "sniper" weapon (or in today's fru-fru nomenclature a "precision rifle") can do in the hands of a highly trained individual.
Just my two cents. Just my opinion and I may be, probably am, wrong.