Bigger objective lensed scopes are substantially heavier than smaller 42mm. They have to be mounted much higher - taller mounts, and because of the leverage and weight, probably need stronger and heavier mounts. And the weight is higher above the bore, so the rifle feels top heavy, so you end up adding a bigger bipod. And because the scope is high, you don’t get a decent cheek weld so you add on a comb raiser butt bag that carry 10 rounds of ammo. By now you have added a lot of extra weight, so you need a biathlon type sling to carry the rifle.
On a hunting rifle the little 3-9x36 Swarovski is a stunning little scope. Sadly no longer available in the UK. I have one on my 243 and its all I need. I have a Leica 2.5-10x44 on my 7x57. Its on a 30mm tube and its a bit bulky. My 243 did wear a 4-12x50 Swarovski. It got dropped so sent it off for repair. It needed higher mounts. I temporarily put the 3-9x36 back on. 5 years later its still on and haven’t felt the need for a bigger scope.
If I was buying again i would have a close look at the Khales Helia 3 4-12 x44. This is a lightweight scope, but can be equipped with a ballistic turret which means you can dial for longer ranges if needs be. Buts on a 1” tube so you can mount it nice a low. S&B did do the 4-12x40 Summit - I think it is now discontinued. Another superb scope.
Many seem fixated on high power scopes and use 20x for taking shots on deer. Personally I like a wide field of view around the deer as it allows you to see what else is going on etc. And it allows you to see the shot reaction. Higher magnification shows up all your wobble and vibrations.
