I have a d-90f airsoft gun and......?

i have a d-90f aisoft gun and i have been using .12 bbs and the accuracy of the gun is like horrible now ive heard that seamless .20 bbs work much better in electric airsoft guns but im not sure and im ready to buy some but i i dont want to buy some bbs that dont work well in my gun so i was wondering do these seamless .20 bbs really work good enough to hit a 2 foot by two foot square at 60 feet with a small wind?? please answer soon.