I put a NF NXS 2.5-10x32 (compact, 20 oz, same as the x42), on a Sako Finnlight 30-06. The rifle alone is 6 - 6 1/2 lbs, so not as light as yours, but it balances perfect. I tried another NXS at 33 oz, but it felt a tad too top heavy. The barrel length may have an impact on how it handles also.
Hope this helps. Post pics when you get it set up.
Will