is 2500 fps a no go zone.

[fiver]

so is 2500 fps a kind of no fly zone?
it seems like I never see any real accurate loads target that velocity.
2400-2450 fps seems to have some real super nice accuracy nodes
I know over 2600 the BC and trajectory seems to suddenly line out and the loads fly a ton flatter.
is there a little flutter zone there at 2500 fps?

 

[Intheshop]

Fiver,"flutter"..... Which I consider real,is IMO gonna be tough to define.Have read about it in JB ballistic articles and get pretty glossy eyed trying to digest.Its chocked full of theory,big words and calcs.

Blow a pce of typing paper across a slick table..... we've all done it.The paper starts to move,slows,"flutters"..... then hauls arse across the table.There are also similarities in an arrow flight.We also see it in machine balancing.So,how one goes about processing the information is up to them.Some need volumes of calcs and computer simulations before accepting?

I've got hunches on what works with HV CB's,will let you know.

 

[Ian]

Yes. .308, .30 XCB, .30-'06, 22 and 23" barrels, 10-11-12" twist all stink at 2500 fps. In fact, most of them don't come together again until 2600+. .270 really likes 2700.

In sporter or light varmint barrels around 22-24" I think I could make a compelling argument for 2225, 2450, and 2600 being sweet spots. Oh, and somewhere around 1900

 

[RicinYakima]

Interesting. The model 1903 International load from the 1920's that won all the matchs for the Americans were hand loaded to 2200 with the 9 degree 173 boat tail bullet.

 

[35 shooter]

Don't know about a no fly zone, but since you mentioned it, seems in both 35 whelen and .308, 25 to 2550 fps. would try, but never seemed to really settle down.
Accuracy would start coming back in at around 2600ish.

On that other site, i believe Blammer has a very good load in his whelen at 25 or 2550 fps. with 4895 and a 200 gr. bullet though.
He killed a hog at 200 yds. if i remember right with that load, 1 shot said and done!

 

[Rally Hess]

There might be something to it, but I couldn't do the math. All things flying have a "sweet Spot", but they have different spots, a lot of which depends on frontal area, shape, elevation, etc. I'm not sure how it converts to bullets flight but it does aircraft. I was air Navy my first tour in the service and was sitting on a flight line in Yuma Arizona, listening to training films about the subject. We couldn't fly due to outside temps being over 110 and the damage jets did to the tarmac when landing, so either we played spades or listened to training films! The math and subject were way beyond my pay grade. The subject that day was directed at fighter pilots and fuel usage in fixed wing aircraft, and how to conserve fuel, when needed, over the ocean or land. Maybe Bill will chime in.

 

[35 shooter]

Yes. .308, .30 XCB, .30-'06, 22 and 23" barrels, 10-11-12" twist all stink at 2500 fps. In fact, most of them don't come together again until 2600+. .270 really likes 2700.

In sporter or light varmint barrels around 22-24" I think I could make a compelling argument for 2225, 2450, and 2600 being sweet spots. Oh, and somewhere around 1900

Rain woke me up tonight so i browsed back through this thread and realized the nodes you mentioned are exactly where my 12 twist .308 and 14 twist 35 whelen like to shoot.

 

[Bret4207]

I was air Navy my first tour in the service and was sitting on a flight line in Yuma Arizona...

Spent quite a bit of time at MCAS Yuma. Great station.

 

[Rally Hess]

Bret,
You must like sage, lizards, and heat! Spent an evening down at "the zone", and fortunately, I was the lowest ranked sailor in the car when we came back across the border. It was July when I was there TDY from NAS Oceana, Va.. I was ground support for VA42 with a few pilots from Va176 also there. I think it was the hottest place I've ever been. I prefer -20 and snow.

 

[Ian]

Funny how we're all different. I like the desert and would be living in the south west somewhere, probably Sparks, if my wife could stand it. So we live in SW Texas where we have lots of heat AND humidity, and mosquitoes and allergens year 'round! There's a disconnect somewhere, maybe she'll see the light before old age overtakes me.

 

[RicinYakima]

Don't tell anyone. Shh! Silver City, NM. (Also known as the Santa Rita silver mines before 1800.)

 

[KHornet]

Have lived in the tropics, in the north east, south east, middle America, north west, and Alaska. Of all of those, Alaska was the most agreeable to me an my family. By agreeable, I mean the healthiest! For an outdoor person I found it ideal year round except for the national bird of Alaska (the misquito). Been gone many years now, but still miss it. Weather today in eastern Ne is basically yucky, but am to old to move, and taproots keep me here.

Paul

 

[Rally Hess]

Where were you stationed in the tropics, if you don't mind my asking? My wife won't let me go to Alaska, she knows I'd never come back.

 

[Will]

I went up quite a bit from my 46.9gr charge of 4350 with the 308 hunting bullet. This should push me pretty well into the 2600fps area. That should show me if staying in the 2500fps is what’s giving me problems.
At that point I have as much 4350 as I can fit in the case. I’m feeling some crunch when seating bullets around 47.5gr. This should also increase my engraving pressure some which may get me into some pressure trouble but I’ll keep a close eye on it.

 

[KHornet]

Rally, 2 yrs in Tiawan (loved it), a in Vietnam (beautiful country but no desire to ever go back).
Paul

 

[KHornet]

Will, will be real interested in your results.

Paul

 

[fiver]

that's pretty close to the 47 I tried with AA's 2700 with the XCB bullet. [which I figured was right close to 2600 fps]
the 2700 is a fine grain ball powder so it has more room in the case.
it generally likes a little compression or at least a 90+% fill rate, so a jammed start wouldn't bother it too much with a little less than a full case.

 

[35 shooter]

Will,
A long drop tube may get you a bit more in the case if you get on top of a node at 2600 and can't quite get there otherwise.

 

[Will]

I may give that a try if it’s necessary. I figure going from 46.9gr to 47.5 will show me if that accuracy node is going to pan out.
Also loaded some with win 760 that should be around 2400fps. Might work better a little slower than what I’ve been shooting.

 

[VZerone]

First let me say that every rifle is different. What may be very accurate in your rifle may not be in another. There are accuracy nodes, but to them fps figures is totally wrong! A good bit of the nodes are about harmonics. Just as with a barrel tuner installed on a barrel as you dial it and find an accuracy node, then turn more and it goes to hell, and keep turning it comes to another accuracy node, and so forth. Because these tuners have a fine thread pitch that would boggle your minds, there are to say at least many many nodes. To give you an example of how little of an amount you have to turn a barrel tuner the number is in the neighborhood of 1/50th of a thousandths of an inch!!!

Some one on here saying 2500 fps is a no go zone is not totally right.