I play around every year with loads and chokes and guns.Everyone is different.I worked with 2 new 835's right out of the box.Those 2 guns patterned way different one than the other .One of the worste combos for one worked the best in the other!You just have to see what works in yours.
One place you might want to start is Win.Extended range.My buddies andI ran them thru 10-12 different guns and got atleaste a good pattern out of every gun.I think 7 guys wound up shooting them last season and nobody had a gripe with the loads.I stayed with my old Federal loads but will be going to the Ex.range this year.I just got to decide on #4 or #5's they both pattern great!
Have a great season with your new toy!