3.340" OAL shouldn't be a problem assuming your rifle has a normal length of leade. I am using 3.350" to get the bullet a little closer to the rifling with a Rem. 700, and it doesn't touch the rifling.
If you do suspect that the bullet is touching, you can try the old "smoke" test. Although these days it's done with a Magic Marker or similar felt tip marker. Coat the bullet around the ogive. Be sure your safety is on and cycle the round. Only do this if you can point the rifle in a safe direction, assuming the case is loaded, otherwise do the exercise at the range.
You can also determine the distance to the rifling with this little trick. First get a non-resized non-primed case that has been fired in your rifle. Slip a bullet into the mouth (it should be free to move), but leave it fairly long. Load the round and close the bolt, the bullet should touch the rifling and be pushed back into the case. Gently remove the round and measure the OAL now - that's your maximum OAL. The actual distance to the lands will be shorter than that since the rifling usually touches the bullet somewhere along the ogive. If you suspect the bullet might have been pulled out a little when you brought the bolt back, coat the bullet with the felt marker around the base and you can tell if that happened.