Arrow weight question ????

[LimBender]

You could buy new broad heads, but an extra 100 grains will probably change the spine too much to get them flying right.  Do you have any room to cut them down an inch or so?  You may be able to cut them down and add the grains.  

THere have been a lot of discussions of heavy arrows over the years if you search, which get into KE v. momentum, physics, and stuff beyond my grasp.

As you may have learned, don't use epoxy to glue arrows in and if you can cut your own arrows.  I mess around a lot with a test arrow with no fletchings until I like the flight, then cut and glue.  Trial and error.