Thunderhead 100 Modifications
 

I just picked up six new Thunderheads this past weekend and I plan to use them for the PA deer season. They've worked well for me in the past, but I also have noticed that they tend to be 5-8 grains over the advertised 100 grain weight.

My question is, have any of you ever tried filing those extra 5-8 grains of thread off the back of the broadhead, or have you done anything else to reduce this weight? I may try it depending on how much thread I have to work with.

Fritz

RE: Thunderhead 100 Modifications
 

Nope... I have 125gr Thunderheads and now use them as a backup. They are known to fly a bit low, due to the increased grain weight compared to what they are advertised as. Read my thread on the review forum, as you'll see how I compared Thunderheads to Magnus Stingers to Slick Tricks.

I guess some guys tune their bows for Thunderheads (lower the nock point a hair) and go with that, but then don't shoot field tips at all during the season.

Butch A.

RE: Thunderhead 100 Modifications
 

I've thought about it. The o ring and retainer are where the weight is coming from so you would need to end up with a pile of shavings at least that big in equal amounts from each blade (You know what I mean). I don't think I could do that good of a job. I just think I'll keep poking comments in when I can and maybe someone who can do something about it, will.:D

RE: Thunderhead 100 Modifications
 

I've weighed a lot of different broadheads and not very many of them weigh the exact advertised weight. They are typically very close (within a few grains). I think the more important thing is that they are all consistantly very close to the same weight.

RE: Thunderhead 100 Modifications
 

Why bother ? If the heads you have all weigh the same or within a grain or two just adjust your shooting .

RE: Thunderhead 100 Modifications
 

I like to be able to shoot field tips and broadheads throughout the season and I considermy bow tuned only when broadheads hit the same spot as field tips. The first step to insuring this is to make sure all heads weight exactly the same.

RE: Thunderhead 100 Modifications
 

Over a 350-450 grain arrow, your shooting can tell 5 grains difference? I would think if they are not hitting the same its not the 5-8 grains, its something else.

RE: Thunderhead 100 Modifications
 

It may very well be. I have gotten the two to hit the same spot in the past, but the "flyers" always seemed to be field tip high and broadhead low. Anything I can do to have confidence in my equipment translates into confidence afield later. Call me anal retentive, but that's why it's a hobby......:D

RE: Thunderhead 100 Modifications
 

Ok , but only since you insist ...

If the difference between your field points and the broadheads is only an inch or two it would be much simpler to adjust your shooting , you're still in the boiler with a diff that small . I also question whether it's the 5-8 grains or something else , have you inspected every part of your gear ? A 5-8 grain diff is pretty miniscule , that's literally 5-8 grains of wheat and wheat is pretty light stuff . Altering your broadhead is just asking for even more flight problems .

I shoot instinctive with a recurve and consider a 3" group pretty damned good if they're all in the kill zone . Sounds like you're sweating the small stuff . BTW , it's all small stuff . ;)

RE: Thunderhead 100 Modifications
 

In a way, I understand what hes saying. I like to have both my FP and BH hit in the same exact spot, and Ive noticed that TH100s fly a little lower out of some bows. I can usually adjust this minor low hit out by moving the rest height up ever so slightly.

On my Ultratec, I have it spitting TH100s right in the bullseye out to 40 yds. but my FPs hit slightly high and left. Maybe 3" high, and 1-2" left. I tried everything to get it dead on, and they just wouldnt meet. So I sighted in to the TH100s and Im happy. My Xtec on the other hand,shootsTH100s andFPsin the same spot. Go figure?

Some of it may have to do with spine of the arrow, and how the longer BH changes the spine and length ever so slightly, and maybe it has to do with more drag due to blades. 6 grains is really not much, and some arrows are offby more than that.Whatever it is, I wouldnt worry about it. If you really cant sleep because of it, try to add weight to your FP's till they weigh 106 grains. Maybe just a small collar on the back.

Than you can practice with either or, and never have to change a thing.

---Matt:)

RE: Thunderhead 100 Modifications
 

5 grains is roughly 1 fps. However you are changing teh FOC of the arrow with an identicle fp vs bh, so if you are running low foc with fp, then you might hit low with the bh.

But like you said, 100% confidence in equipment is the most important thing, I use to tinker til they hit identicle, now I switch to BH and play around until the group tight at all ranges, starting by BH tuning. Usually they end up real close.

RE: Thunderhead 100 Modifications
 

Since it isn't legal to hunt with field points anywhere that I'm aware of it's really rather pointless to compare most broadhead's performance to them anyway . I practice with field points too , but as the season nears I switch over to the broadheads exclusively . Any problems that I'm gonna have then will become apparent in time to correct them . Switching back and forth from fields to B-heads has been a waste of time for me , and somewhat frustrating , so I don't do that anymore .

RE: Thunderhead 100 Modifications
 

Yeah but.... {call me ignorant and lazy}... ;)

I always shoot both field tips and broadheads. I practice in my backyard with field tips a majority of the time. Then I goof around shooting both for a while, so I can see where my broadheads are hitting in relation to the field tips. Once I find a broadhead that hits exactly where my field tips do, I call that perfect and then just go with it.

Butch A.

RE: Thunderhead 100 Modifications
 

butchwhy not up your field points 5 grns this would be easer.myth100's are 5 grns more than my points and they are spot on out to 30 yrds..sorry guysthis is to mrfritz44

RE: Thunderhead 100 Modifications
 

I shoot 125gr field tips out to 40 yards and am pretty much dead on in the bullseye. My 125gr Slick Tricks fly just like field tips too. But ironically, my 100gr Magnus Stinger 4 blade heads also, strangely enough, fly just like field tips even though their 25 grains lighter. I got a headache trying to figure it out, so I just go for it with what I got.

Butch A.

RE: Thunderhead 100 Modifications
 

I agree with Snood Slapper . . . the minor difference would be negligible. Similarly If one wasn't careful the balance could be thrown out of whack!