MVA scopes and barrel lenghts?

[Eric Johanen]

The rifle I have on order will be a 34 inch barrel and I asked for Shiloh to drill and tap it for the scope blocks. They quoted me with block spacing for the MVA series 6000. I also have a 30 inch barrel I might want to scope in the future and hope to get some information from shooters on which scope will be useful with both barrel lengths. I compete in Creedmoor matches so posing the question for 1000 yard shooting. Is the block spacing the same for the 6000, 4000 and 3000 series? If using a shorter length scope, would the 4000 or 3000 be to short in the tube to have a clean sight picture on the 34 inch barrel? I would like to go shorter if possible to be useful on both barrel lengths and avoid the possibility of debris blowing back to obscure the front lens. The mount would be the new Creedmoor and I am thinking of using the 7 mil dot reticle. Any advise appreciated.