Est. this shot distance and my fps.

[xrob]

Hey,
I was out with my friends shooting at distance, but didn't know really how far it was. We were shooting a 8" shoot n see target, milk jug and 2 liter.

I dialed 3 minutes and was on with my 30-06, 22" with my handloads.
49.3 varget 150 sst, brass with 60 gr water weight. est. fps around 2900-2875 fps.

My question is what do you think the distance and my fps are?

I estimated about 250-275 yds.

thanks

 

[vinsonr]

Re: Est. this shot distance and my fps.

You can't estimate velocity without knowing every other variable with 99.9% accuracy. A velocity increase of 100fps moves my .308 round an inch up @ 275 yards. Unless you are capable of measuring your point of aim and point of impact exactly it's really not feasible to estimate velocity. Without the exact range of the target it's even less possible.

 

[gvanhyning]

Re: Est. this shot distance and my fps.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Vinson</div><div class="ubbcode-body">You can't estimate velocity without knowing every other variable with 99.9% accuracy. A velocity increase of 100fps moves my .308 round an inch up @ 275 yards. Unless you are capable of measuring your point of aim and point of impact exactly it's really not feasible to estimate velocity. Without the exact range of the target it's even less possible. </div></div>
+1 ... you need a good velocity to reverse engineer the distance. Likewise, you need a good distance/range to reverse engineer the velocity.

 

[Mendy300wm]

Re: Est. this shot distance and my fps.

This is like one of those math problems in school...
(X+Y-D)(htc_mdb_v2.0.7_normal)= and I would put down on my paper, "I have no fucking idea"

 

[Bennyboy]

Re: Est. this shot distance and my fps.

The quick and dirty answer is buy a range finder and a chrony.

I am editing because I wanted to say that I am not wanting to sound like a smart aleck, it is just the only way I see to be truly accurate.

 

[fw707]

Re: Est. this shot distance and my fps.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bennyboy</div><div class="ubbcode-body">The quick and dirty answer is buy a range finder and a chrony. </div></div>

Yes, and if you can't get them both at the same time, get the range finder first.

 

[Bennyboy]

Re: Est. this shot distance and my fps.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: fw707</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bennyboy</div><div class="ubbcode-body">The quick and dirty answer is buy a range finder and a chrony. </div></div>

Yes, and if you can't get them both at the same time, get the range finder first. </div></div>

+1 on the priority of the range finder.

 

[HillbillyfromAL]

Re: Est. this shot distance and my fps.

I really like my Bushnell 1600 LRF Binos, I think they are hard to beat for the money. How did you measure the distance? One thing with alot of guys that just guess the distance is they tend to overestimate. What alot guys thinks looks like 250 might really be 150. Of coarse it's just natural like when she asks how long it is and you say 9 when it's really 6

 

[xrob]

Re: Est. this shot distance and my fps.

So... thanks for the Google earth idea, I pulled this picture off and tell me what you think the distance is now? I have calculated 897 ft or 299 yds

as for FPS, I just need to shoot over a chrony, waiting till someone lets me shoot a couple rounds over one, cant get one right now, just upgrade scopes to a Nikon Buckmaster 4.5-14x40 mildot, so I am will get a mil reading next time on some known target sizes and get a good estimation on the distance.