Is there any reason why you would want to hunt deer with a shotgun? Is it the only type of firearm you can use in your area?
This is a good post if you want to learn a bit about buckshot and hunting.
http://www.canadiangunnutz.com/forum/showthread.php/948571-Testing-Buckshot-effectivness
If you plan on taking deer with buckshot, maybe you should get the Maverick with the 28" barrel with interchangeable chokes.
http://ww w.cabelas.ca/product/3819/maverick-88-3-12-gauge-pump-shotgun
Keep in mind that you can buy the Maverick 88 with a 24" rifled barrel and sights if you want to use slugs.
http://ww w.cabelas.ca/product/38512/maverick-88-field-slug-pump-shotgun