NRA Sporter front sight base distance

[Willgaga]

Should have titled this “Scope Base Distance” - apologies

From what I have read in Brophy, it seems that the most common distance between the sight blocks on a NRA sporter .30 cal 1903 was 7 3/16 or 7.2”. This would give an adjustment of .25” per click on a Lyman 5a. I also know the NRA sporter could be ordered drilled and tapped for a scope. Question is whether it is possible it could have been ordered drilled and tapped for 6” centers? In reading the book for the Lyman 5a it gives adjustment instructions for both 6” and 7.2” bases.

Would 6” ever be a preferred option on a NRA sporter or would you only do 6” where you had no other choice due to the characteristics of the rifle itself?

Thanks much,
Will

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