Does anyone know where I can find heavier than 145grain field points for the beman mfx shafts. thank you

Try Kustom King Archery, or 3Rivers.

you might have to go with a heavier insert...PR

Bull Mountain Archery has them.  I have 100 thru 250 grain points.  I picked all the heavy ones up from Brock.  Heavy being 145 grains and up.

I have looked around and 145 gr. is the heaviest made to fit them correctly.I usally go with heavier inserts to get more weight up front in tuning them.What I did on one set of MFX I had was to foot them with a 1" piece of 2020,and then 5/16" points fit more flush.And you can get 5/16" up to 300 grs. and many sizes inbetween.Or another method you can get broadhead adpaters and then use 11/32" points or steel broadhead adpaters and use with glue on points.There are many different combo's you can come up with.

Big Jim and bob Morrison have them up to 300grns.

braveheart archery... by far the best I've dealt with and a sponsor here!