I like my 3x9x40mm's and for me I wouldn't want to go any smaller power wise as I often shoot on 9x. I have two of those and one 3x9x32mm. Some buddies like lower powered scopes though and never turn these up past 5x. That's just not how I like my scope but it kind of comes down to personal preference. If it was me for 100 yards I'd get a 3x9x40mm plus they are as said everywhere. At 9 power it does really well at 100 yards. I wouldn't even mind having something with a little more power.