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Very Hot Topic (More than 25 Replies) Spire point verses meplat type bullets (Read 6277 times)
jhm
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Spire point verses meplat type bullets
Aug 4th, 2020 at 7:04pm
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I recently completed a roller in 32-40 Rem Hepburn. I am shooting a 165 gr cast with a meplat. Is there any advantage to a spitzer type bullet? My velocity is around 1200 fps. and my twist is 1 in 10.


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marlinguy
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Re: Spire point verses meplat type bullets
Reply #1 - Aug 4th, 2020 at 8:05pm
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In my opinion the advantages of weight forward as larger meplat bullets have outweighs BC of pointy bullets. I do like the rounded nose of the Money Bullet style though, which is a nice combination of weight forward without being a spire point, and better BC than flat points.
  

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oughtsix
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Re: Spire point verses meplat type bullets
Reply #2 - Aug 4th, 2020 at 8:23pm
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I can’t speak to the ballistics of meplat vs pointy bullet but a pointy bullet will breech seat easier, if you are going that route. Or you have a tapered bullet.  But the debate always comes up at our bullsessions  at the range and the fact that NASA makes pointy rockets tends to trump flat nose.  Could be we are all nuts, and it’s just aesthetics.    Please report successes, I have a .32-40Rem, too


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oneatatime
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Re: Spire point verses meplat type bullets
Reply #3 - Aug 4th, 2020 at 9:17pm
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Of course our bullets aren't coming into the atmosphere at 24,933 fps (that's 17,000 mph) and besides, the rockets are coming in butt first.
  
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Re: Spire point verses meplat type bullets
Reply #4 - Aug 4th, 2020 at 9:46pm
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This bullet shoots the best breech seated in my 14 twist 32-40.   

Mine is from the Hoch mold that CPA used to sell but this one looks identical.

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Re: Spire point verses meplat type bullets
Reply #5 - Aug 4th, 2020 at 9:47pm
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But of course they don't launch and reach 24,933 fps butt first, and don't re-enter our atmosphere butt first, although they do land butt first. Kind of like comparing apples and oranges.
  

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Re: Spire point verses meplat type bullets
Reply #6 - Aug 4th, 2020 at 10:09pm
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jhm
Unless your bullets are going supersonic a spitzer point bullet isn't going to buy you much, if anything, in the way of bucking the wind better than a more blunt nose bullet design.
  

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Re: Spire point verses meplat type bullets
Reply #7 - Aug 4th, 2020 at 11:42pm
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I cannot tell any difference in accuracy or wind drift. I certainly can see a difference on the target. The flat nose bullet holes are easier to see. 

"A spitzer/spire point bullet breech seats easier."  You got me on that one.   Undecided
« Last Edit: Aug 11th, 2020 at 2:07am by westerner »  

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Re: Spire point verses meplat type bullets
Reply #8 - Aug 5th, 2020 at 8:24am
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I am having very good accuracy results with the
modest ogive Lyman 311299 bullet in my 32-40 Rem Hep/8 twist. Currently fixed load
beltfed/arnie
  
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marlinguy
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Re: Spire point verses meplat type bullets
Reply #9 - Aug 5th, 2020 at 9:31am
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Ballistically a rocket is much longer compared to diameter than any bullet. Tough to compare a rocket traveling through the atmosphere to bullet shapes that are stubby. At some point bullets begin to destabilize, and the heavy base tries to pass the lighter point. It happens sooner with pointy bullets.
  

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JLouis
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Re: Spire point verses meplat type bullets
Reply #10 - Aug 5th, 2020 at 12:19pm
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Jhm has nothing to do with bullet design but there should be a big  advantage if you were to bump your velocity up. The 1450 - 1475 average velocity range has always worked very well for myself. You should also find another sweet spot in the 1350 - 1375 fps range as you continue going up to the 1450 - 1475 fps range. Just keep a close eye out for any pressure signs as you continue going up and you will find something that your rifle likes extremely well along the way.
  

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Re: Spire point verses meplat type bullets
Reply #11 - Aug 5th, 2020 at 12:47pm
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marlinguy  Bullets may/ do destabilize but certainly not at any range we are concerned with. Extreme long range rifle bullets are still stable at, well, extreme long range. Those bullets look very much like the proverbial rocket ship. And for good reason.
  

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Re: Spire point verses meplat type bullets
Reply #12 - Aug 5th, 2020 at 12:51pm
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JHM, to answer your original question, no.
  
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Re: Spire point verses meplat type bullets
Reply #13 - Aug 5th, 2020 at 1:37pm
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Bullets start out unstable and will return to being unstable I believe Dr. Mann has already proven that to hold true. I do believe distance does play a very important part in regards to the best accuracy for the specific distance being shot. An example might be the powder charge I use for 100 yards is not the same as what I use for 200 yards in regards to shooting the smallest groups. I honestly do not know why but I do believe it has to do with the bullets stability in flight at each of those specific distances that are being shot. As far as flat nose, round or spitzers go your rifle will let you know which one it likes the best. And I have also found that its preference can change depending on which distance is being shot. The Spitzer might be better at 100 yards and the flat nose at 200 yards or vice versa so you just need to go out and find out what works out to be the very best for yourself.
  

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Re: Spire point verses meplat type bullets
Reply #14 - Aug 5th, 2020 at 5:48pm
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Thanks everyone. Biggest reason I asked is I have a spire point mold and just didn't want to have to buy another. The bullets I have now are store bought and I am about out of them. My load is 14 gr or IMR 4198. What are some good powders to try and how heavy of a bullet will the 1-10 twist stabilize?


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