100 grain vs 125 grain
 

I have always used 125 grain broad heads. I was wondering if there would be any advantage to using a 100 grain? Im curious if the increase in velocity would be substantial enough to over come, and exceed the inertia lost from less mass. I shot carbons and dont see going to a 100 grain advantageous. Im curious on what you all think.

RE: 100 grain vs 125 grain
 

Let me have a stab at your delema.... If I understand your question correctly then this would be my answer.....If your Bow is shooting @ 275 fps and you are using a 375gr.totalwt arrow your ke would be 62.98 lbs...now changing to a lighter arrow { by 25 gr.} and your speed increased by only 10 fps. your ke would also increase to 63.14 lbs. so I would think that it would be in your best interest to change to the lighter arrow...this does not sound like a lot but when you are at the breaking point of using mechanical versafixed blade it makes all the differance....Every little bit helps right....[:-][:-][:-]

RE: 100 grain vs 125 grain
 

GENERALLY, I find that every 5gn lighter you go, you' ll gain ABOUT 1 fps. Thus dropping 25gn will get you 5 fps.
In all reality, you won' t notice much differance....SLIGHTLY flatter shooting, but nothing HUGE.
You will likely loose a LITTLE KE, but the reduced friction caused by the increased speed will pretty much balance it out to where you' ll have about the same penitration.
Reasons for going to a 100 gn head from a 125? If you have too much FOC (Front of Center balance) you might be better off with a 100 gn head. This could be the case if shooting feathers, and light carbons.
If your grouping well with the 125s, leave well enough alone.

RE: 100 grain vs 125 grain
 

Mahly13 is on the right track with FOC. When shooting fixed broadheads, I find this variable in the flight of an arrow a little more important thatn speed or KE during hunting season. This year I had to switch to a 125 grain broadhead because my FOC was only 7.5...Just by rasing 25 grains I moved to 9.8. My groups have tightened up with broadheads and I couldn' t be happier. Actually the increase in front point weight has also increased my arrow momentum...which means it actually penetrates better. More drag is now required to stop the forward motion of my arrow.

But it could go the other way, you may need to drop down the change your FOC in your favor. I do think there are more broadhead selections in the 100 grain area, but many companies have been coming out with 125 grain version this year from last years models...Makes you wonder a little doesn' t it.

RE: 100 grain vs 125 grain
 

First, you' re overestimating the gain in speed. In reality, the speed gain would be more like 3-5 fps unless the lighter tip really helped out a severe underspine condition.

If my KE were marginal for mechanicals, I would not be betting the farm that .16 ft lbs would make a dramatic difference. It' s still going to be marginal.

Change to the lighter weight only if you need to, in the interest of arrow spine or FOC, or both.

RE: 100 grain vs 125 grain
 

I make my decision based on what draw weight and spine arrow I' m using. If you decrease the tip weight, then the spine is stiffened. If you were shooting the perfect spine previously, you will now have to raise the draw weight to compensate for the stiffer spine. All this is critical when shooting broadheads. You have a wider acceptable range of spine when shooting field tips, especially out of a well tuned bow with level nock travel. Bare shaft tuning is how I determine proper spine.

RE: 100 grain vs 125 grain
 

This is why I plan to go to 63 lbs with my new heads and arrows. The 125s would be too heavy for the 200 arrows to deal with (underspined) at 59 Lbs. But the 300s would be a bit OVER-spined at 59 Lbs even with the 125gn heads...so I need an extra 4 lbs to make it " perfect" according to " The archery Program" at least.

RE: 100 grain vs 125 grain
 

Shoot Muzzy 115 gr. 4-blades and all of your problems are solved....;)

RE: 100 grain vs 125 grain
 

I sighted in my bow tonight for antelope hunting in about 2 weeks. Using CX 400 Camo Hunters and 100 grain Muzzy 4 blade, they weigh 461 grains and at an even 270 fps, they fly like darts:D I' m good to go out to 70 yards on my Easy Slide single pin sight. Groups are very good!