In tinkering with Stu Miller's calculator I've found a set up that nearly matches perfectly.  My problem is I'd need a point weight of 165 grains.  Well, I guess it's not really a problem since I've been looking at the Zwicky No Mercy's.  The problem is finding a field point to match it and test before I go that route.  How do you go about this?  Buy 175's and shave some off?

jonathon,  just use the point weight closest to that.  You could cut a little off a 175gr if you wanted to.  I've took a dremel to a few heads.

Years ago "they" did wind tunnel test's on arrows.
"They" found that the point of impact of a 125 grain field point, was the same as that of a 160 grain broadhead. The reason is because a broadhead get's "lift", and a field point doesn't.
Jim

That's pretty interesting, Jim.  Got plenty of 125's around from my wheelbow days.  

Thanks for your tip, too, Kenneth.  I do want to try with something closer to that weight to test my spine and arrow flight.

I would not use 125's.  That test was not done with your bow or your arrows, and probably not the broadhead you plan to use.    Your arrows spine will be different with the different weight heads.  

I use my grinder and uniformly bevel the back edge of the field point where it meets the front of the arrow.  I can get the weight right at 165 or any other weight I want that way.

You can almost breathe ten grains.  Anyway, a broadhead the same weight usually flies a little quicker than a field point of the same weight; that has been my experience...more aerodynamic I suppose.  Unless you are shooting competition out to long ranges, I don't think you will have an issue with ten grains difference.

Jonathan, I did a post that tells you how I added weight to mt field points for wood shafts This is it.Good Luck
http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=1;t=083295;p=1#000000

Just put 4, 11/32" 5 grain brass weight washers behind the 145 grain field point and that bumps the 145 grain field point up to 165 grains. This is what I do when I need a practice field point to match a 165 grain broadhead. I get mine from 3 Rivers Archery.

http://www.3riversarchery.com/product.asp?i=5208X

Just shoot what you got and when it is time, practice with the broadheads.  I myself don't shoot well enough to worry about 10 - 20 grains
ChuckC

I got a kick out of this.  Last year I took a large collection of 2 blades (Magnus, Zwickey, Bear) and weighed them.  They were up to 30 years old and I found broadheads that had been identical when purchased were now as far as 15 grains apart.  

I guess all that sharpening has an effect.

What George and LKH said.......ChuckC also.

I've never been able to see much difference in 15-20 grains of point weight unless  you are borderline in your tuning.  However, by using different combinations of steel adaptors, glue on points and brass inserts and adding clipped off pieces of solder in the hollow points of the steel adaptors I can get a huge variety of point weights when I'm trying to match field points with broadheads in my tuning. I prefer glue on to screw on just because I have so much more flexibility in what I can create.  I can even add a little piece of solder to compensate for the metal that is removed from several sharpenings.

I find I can shoot broadheads with a difference of as much as 30-40g,,with no real problem.

But for tuning I like to get things exact,that way I have a known base to work from.

A difference of 20g means nothing on the hill.

Right on  George!!!

Simmons Archery sells 160 grain field points. Check their web site.LCH