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Very Hot Topic (More than 25 Replies) .33-47 Bullet (Read 24558 times)
JLouis
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Re: .33-47 Bullet
Reply #30 - Mar 2nd, 2016 at 6:43pm
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Hey Ken I wasn't trying to dodge your comment on your 33-47 spitzer bullet and your success with it. When I still had my 33-47 Briesen I was shooting a 234gr. Mos spitzer and I have yet to own another rifle that shot as consistently good day in and day out. I didn't have a FN bullet to shoot in it at the time as I had no interest in them at that point in time so I can't comment on what might have been. Looking back I wish I did knowing what I know now, it would have made for an interesting comparison.
My 28-35 took me awhile to get figured, I got caught up in the need for speed! When I backed way off it might be as consistent as the Breisen based on the last ten outings with it. It now shoots extremely well and day in and day out so hopefully it will live up to Breisen. One of these days I need to pickup one of your barrels as I admire the time, effort and innovation you are putting into the project to provide thee best cast bullet target barrels out there.

JLouis
  

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beltfed
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Re: .33-47 Bullet
Reply #31 - Mar 2nd, 2016 at 7:17pm
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Guys, 
Please forgive sticking my nose "in the tent" what with my newby situation. Duhhhh!
But, What about an Elliptical nose of appropriate ogive length as opposed to either a (pointed) Spitzer or  a flat nose?
beltfed/arnie
  
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JLouis
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Re: .33-47 Bullet
Reply #32 - Mar 2nd, 2016 at 8:17pm
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You are not sticking your nose into anything and its well worth a try! The problem is getting a mould as I would also like to give it try. There is still allot out there yet to be discovered and going after it is a big part of the enjoyment! After 15 years of successful competitive shooting I have learned that there is always more out there that might make ones accuracy just a tad better than what it currently is and there is absolutely nothing written stone.

Great idea and thanks for sharing it!

JLouis
  

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JLouis
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Re: .33-47 Bullet
Reply #33 - Mar 2nd, 2016 at 9:27pm
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Beltfed here is an example of out of the box thinking. The bullet is a 147.0gr. 28 cal truncated bore riding nose breach seated plainbase bullet. Cast 20/1 lead tin alloy, Rifle is chambered in 28-35, self smithed, 12 twist Douglas, 13.0grs 300MP, CCI 200 primers and shot at 200yds with several others like it. Out shot was a sighter for hold off and then 10 consecutive 25's. Target shot during load development outing and pratice and not a match.

I think this might qualify as taking ones head out the sand and opening ones eyes what do you say Frankore?

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JLouis
« Last Edit: Mar 2nd, 2016 at 9:53pm by JLouis »  

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gunlaker
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Re: .33-47 Bullet
Reply #34 - Mar 2nd, 2016 at 11:10pm
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That is some exceptional shooting!   

Steve Brooks will cut .32 cal elliptical molds if anyone wants to try one.  I have one but it's for shooting paper patched bullets over black powder.  The results were not impressive, but the mold is good.

Chris.
  
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beltfed
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Re: .33-47 Bullet
Reply #35 - Mar 2nd, 2016 at 11:38pm
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Don't know if this is gonna work. 
Attached is a group shot with my Elliptical PP bullet shot out of my 40-65 at 100 yds
  
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gunlaker
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Re: .33-47 Bullet
Reply #36 - Mar 3rd, 2016 at 12:34am
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I've had good result with elliptical .38's, just not the .32's yet.

Chris.
  
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JLouis
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Re: .33-47 Bullet
Reply #37 - Mar 3rd, 2016 at 10:54am
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Extremely nice shooting beltfed!

JLouis
  

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Re: .33-47 Bullet
Reply #38 - Mar 3rd, 2016 at 11:07am
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From information I have read, a flat metplat bullet was designed by Elmer Keith for more impact on animals.  The flat does/will change the BC of any bullet due to drag, slows it up a touch.

From all I have been taught,  thru the years, the longer a bullet is exposed to the conditions the more it is effected.
I have also been taught a bullet can be over stabilized, or under stabilized causing other problems.

I look at airplanes, and I see none with much or any flats on the front of the planes.

I'll stick with my pointy bullets.   
I have wheels on my vehicle so I don't have to see if there is something better.
  
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frnkeore
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Re: .33-47 Bullet
Reply #39 - Mar 3rd, 2016 at 12:05pm
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I built wind tunnel models from the mid 70's to 1980. The company that I worked for, was doing R&D for both the Stealth and Cruise Missle projects, at that time.

That is when I got into wing design for my Formula Atlantic race car. Pictured is the car and the wing I design of it. It's a Delta shaped wing made of fiberglass and tapers in all planes. I learned many things about air flow at that time and have been interested in it and studied it ever since. 

A bullet is nothing more than a round wing and obeys the same laws of psychics. The first thing you need to know, is that there is a huge difference between subsonic and supersonic flight.

At subsonic velocitys the air has to flow around the nose and body of the bullet to have the best BC and ellipical bullets do that best. Any anomaly (such as a flat nose), can cause localized shock waves on the surface, hurting the BC and creating more pressure on the nose.

In supersonic flight, you want as sharp a profile as can be had because you are now pushing that shock wave and the more that you can bend it back, the higher your BC will become because your bending that wave back.

For a reference to this, you need to look at pictures of bullets pushing the shock wave, Lyman has some in there manuals.

Shooting round, flat or ellipical noses at supersonic speeds, create broad shock waves and broad shock waves take more power to push than more > shaped shock waves. All shock waves take more power to push than subsonic, no shock wave flight, if you can maintain the laminar flow.

Trucated nose shapes can be very effective if the angle is low and the flat, very small. High Mach, air planes shuch as the SR71 have a sharp point to their wing profiles.

Wind drift is a direct product of the perentage of velocity lost and doesn't correlate to ToF, especially in subsonic flight.

Now then accuracy is a whole different thing, any stabilized bullet shape can be accurate but, if you think that conditions won't move a low BC bullet more than a high BC bullet, you just wrong. People that say "I feel that" it moves less are just kidding themselfs and need to take a class in physical law.

I would suggest that people that are interested in bullet shape, read up on aerodynamics both above and below the speed of sound.

Frank
  

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Re: .33-47 Bullet
Reply #40 - Mar 3rd, 2016 at 12:09pm
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Elmer Keith?  Born 1899. First flat nose projectiles appear early 1800s. The word meplat? Never heard it till just a few years ago. 

I'll go with the most accurate bullet in the rifle I intend to use, flat nose or pointed. 


        Joe. 

  

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JLouis
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Re: .33-47 Bullet
Reply #41 - Mar 3rd, 2016 at 1:16pm
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Nice post Frank and very interesting all though it is all very basic knowledge in todays world. In these times there are several instances where the law of physics would say it is impossible but it still works. As you know but it might be unknown to others a bullets BC changes with every shot fired it never remains the same or a constant. When reviewing the ballistic system printouts the long spitzer bullets all though having a higher BC they also show a greater BC fluctuation from shot to shot than other less radical nose designs. Knowing that the BC represents the time of flight from muzzle to target which one would have the greater possibility of providing better results / less bullet displacement at the target. These BC fluctuations would also change the bullets wind drift characteristics from shot to shot. This could possibly be why I see less wind drift with the FN bullet as well as more consistency at the target? I also think it unwise when one / the target has proven this to be true as in my case that he should be called a fool. I don't fully understand everything that takes place in a bullets flight as I personaly only care about the results the targets are showing me as they do not lie nor do they care if they do or do not agree with the law of physics so nor do I.

JLouis
  

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frnkeore
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Re: .33-47 Bullet
Reply #42 - Mar 3rd, 2016 at 1:51pm
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John,
Would you mind posting the results of one of your bullet tests. The pictured test is one that Barry did for me on my design that Brooks made for me. It's a 10 shot string.

It shows a ES of the bullets BC of .008 and a SD of .003. It also shows that the ES of velocitys was 8 fps at the muzzle and 8 fps at the target.

Frank
  

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JLouis
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Re: .33-47 Bullet
Reply #43 - Mar 3rd, 2016 at 4:07pm
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Frank first I would like to say that car was pretty Cool! 

In regards to the ballistics printouts no two are the same and one has to shoot and then review a binder full to start to get a taste of what is acctualy going on and not get fooled.
Just like practice or match targets you can shoot one that is extremly good and then several that are not so good. You have to shoot several to see what is really going on and you can't base a rifles overall performance on just that one good target and the same holds true for the printout results. I have found over the years that real good target is often times just a fluke and a false indicator of what is really going on. Most all of us have gone out with a chrongraph and will have a ten shot string with low SD's and ES's and the very next ten shot string shot right after it will have just the opposite and on the high side. Also at times the lower SD's and ES's don't provide the best results on the target as one would expect.

In an earlier post you stated "I don't stay at my home range and shoot target after target, to get what I want." then how do you know what you have?
I have spent years doing just the opposite, I know exactly what I want and then spend countless hours at the range to pursue it.
You also stated in the same post "You can learn a lot by going to other ranges and it's a LOT of fun meeting others and seeing what actually works in our sport.
I agree on the Fun part and meeting people but if you don't already know what works in this sport
before you get there how can you continually make claims on what does? When one adds up your two statements they don't equate to your claims having any creditable Merit?

I have absoulutly no reason to come on here and falsify my findings, they are truthful facts brought about countless hours, experimention and years of hard work by putting an endless amount various bullets through paper at our range using various powder and primer combinations to get exactly what I want. My Joy in life is to come here and share it with the new shooters coming into this sport and it becomes a difficult task while others as yourself are continualy trying to discredit my honesty. 
It all boils down to either what I say is true per my findings or I am person who can't be trusted / a liar who is only here to stroke his ego? I will leave that determination up those who I am trying to help get ahead in the easiest and quickest way I know of to reach success in this sport I so Love.
  

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frnkeore
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Re: .33-47 Bullet
Reply #44 - Mar 3rd, 2016 at 4:47pm
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Quote:
In regards to the ballistics printouts no two are the same and one has to shoot and then review a binder full to start to get a taste of what is acctualy going on and not get fooled.
Just like practice or match targets you can shoot one that is extremly good and then several that are not so good. You have to shoot several to see what is really going on and you can't base a rifles overall performance on just that one good target and the same holds true for the printout results. I have found over the years that real good target is often times just a fluke and a false indicator of what is really going on. Most all of us have gone out with a chrongraph and will have a ten shot string with low SD's and ES's and the very next ten shot string shot right after it will have just the opposite and on the high side. Also at times the lower SD's and ES's don't provide the best results on the target as one would expect.

Just show us one or two, supporting the increased stability of the flat nose bullet

Quote:
In an earlier post you stated "I don't stay at my home range and shoot target after target, to get what I want." then how do you know what you have? You also stated in the same post "You can learn a lot by going to other ranges and it's a LOT of fun meeting others and seeing what actually works in our sport.

I know what I have in several places and I've learned more about wind and conditions, shooting at Spokane, than I did shooting at Brea, here and Springfield combined. A excellent reason to shoot at other locations Smiley

Quote:
I have spent years doing just the opposite, I know exactly what I want and then spend countless hours at the range to pursue it.

If that's the case, you should shoot rare target below 248 in the matches?

Quote:
It all boils down to either what I say is true per my findings or I am person who can't be trusted / a liar who is only here to stroke his ego? I will leave that determination up those who I am trying to help get ahead in the easiest and quickest way I know of to reach success in this sport I so Love.


I'm not accusing you of anything, I just like to producing factual info when I can and would like to compare, yours with mine. Just show us your best results.

Frank
  

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