That last bit is good advice, Kelmola, particularly when you keep in mind that in FH sniper kits are not common and in all likelihood you are a) a fair distance away from where you can pick up a sniper kit, b) your team doesn't control a close enough spawn point for you to be able to quickly respawn and re-pick up your fallen kit before it disappears, and c) the sniper class tends to attract a lot of stupid, arrogant noobs and that a sort of plane camping is not uncommon if the location of the sniper kit is well known.
You should also keep in mind that on occasions where you have two different rifles to choose from (some maps you have the Mosin Nagant or SVT40, the Kar98 or G43, the Springfield or Garand, etc.) that which rifle you choose can have a big impact on your success. If you are on Alpenfestung, for example, as an Allied soldier, you can choose between the Springfield or the Garand on the table at the Allied airfield. Although I personally prefer the Garand, keep in mind that with the semi-auto rifles like the Garand, G43 and SVT40, you can get away with a 'desperation shot', i.e. when an enemy discovers your location and comes to fight you at close range, you can empty your entire clip at that enemy in desperation (keep in mind you have no crosshair with a scoped rifle) whereas this is close to impossible with the bolt-action rifles.
That said, the bolt-action rifles above tend to be more accurate over longer ranges, and often carry more individual bullets. If I remember correctly, again on Alpenfestung, you get 8 clips of 5 rounds with the Springfield, whereas you get 3 clips with 8 rounds with the Garand.