I have used 1.5x5x24 Leupolds on 45-0, 375 Win etc. Scope makers pick objective sizes very carefully. It is not a random outcome. Objective size is related to the ratio of power to the objective. So a 1.5-5 at max power gives 5/24 for a ratio of 5. 5 is generally considered to be the maximum light a human eye can use, with good young eyes. As you get older you can't use as much of the available light. If you turn it down to 1.5 you get 16, so lots of light. This is also the right choice for higher powered variables, as you get close to dark turn the power down to get a brighter sight picture.
I have used a 1.5x5x24 with no illuminated reticle night hunting pigs in Texas. On 1.5 power I had no problem whatsoever in shooting pigs at 1 in the morning at 1-250 yards. For night hunting a red illuminated reticle that can be turned down real low would have been nice, but I used what I had and it worked just fine.
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