@Bear_with_me
Pears do obtain a good size on callery rootstock and thats a great question better answered here Pear rootstocks influence on Fruit size. Here are some links back to older threads that shows fruit size. About the closest thing i have to a list of my results growing them by year is here Pear buds, blossoms, and fruit or here Here comes the 2016 apple and Pear harvest!
or here Here comes the 2018 apple & pear harvest! or here Here comes the 2019 pear harvest! . Another thing that should be brought up is when the severe drought showed up my pear trees produced when every other pear tree failed to produce fruit in my area. My general method of topworking can be seen here Top working Pears weather permitting - #32 by clarkinks . More on growing fruit eg. Pears in less than desirable soil If you had to choose for wet sites: apple, pear, chestnut, or persimmon - #10 by clarkinks
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