before looking at the range you must remebr that you lose approximatley 40 fps for every .05 gram of bb weight therefore if you are shooting at 450 fps muzzle velocity with .25 gram bb then you will be shooting at about 370 fps with .36 gram bb. which would mean you actually lose maximum range in a vacuum ( how these numbers were achieved) of about 25 feet. Now this chart does not take into account the extra accuracy or "effective range" you will get with the heavier bb or the dramatic effect hop-up can have on the flight path.
If you are shooting 450fps with .2g bb i would guess even with hop-up off they would fly high at the tail end negating that distance increase. A heavier bb with the proper hop-up - but not too heavy will have a strighter more accurate flight and longer effective range on target.
I would see how .3g bbs work first before moving to .36g I think depending on the length of your barrel and the effectiveness of your hop-up it could be a great sweet spot between "punch", distance and accuracy.
I havea tight bore PDI barrel on an m4 shooting about 450fps w/ .2g bbs and have found the goldenball .32g bb with a proper amount of hop-up to be a great combination.
Remember the heavier a bb the slower it will go but it will retain its momentum for longer - however if it starts out too slow the target might be able to "matrix" you at the tail end of your effective range therefore negating any advantage