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flat base bullets. Why?

 
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  #8  
Old 07-01-2010, 11:56 AM
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Re: flat base bullets. Why?

Boattails are pretty popular in IBS and nbrsa 100-200 yrd benchrest right now. The Bruno 00's and Lowell Hottensteins , which are used by Tony Boyer, some of the more popular ones. The theory about the square push thru the crown is the one I hear most. Also short range benchrest bullets are shot in the slowest twist possible for the rpms the cartridge can generate. Also flatbase bullets have a pressure ring .0001 larger than shank.


Tim J.
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  #9  
Old 07-01-2010, 01:05 PM
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Re: flat base bullets. Why?

I have experienced the same phenomenon. In my experience the crown of the rifle wasn't exactly concentric. Get a good crown on the rifle and it SHOULD shoot em all the same.

Jim
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  #10  
Old 07-01-2010, 02:19 PM
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Re: flat base bullets. Why?

True, FBs & BTs could both shoot well -up close.
But it's BC of the BTs that dominate at distance. Which is why LR competitors use heavy per cal BT bullets(whether they know it or not).
And up close, it's nearly impossible for BT's to compete with FBs.

There is ALWAYS a price.
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  #11  
Old 07-21-2010, 05:47 PM
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Re: flat base bullets. Why?

bullets are haunted by the same problem as muzzle crowns. if a hip of the tail of a is not concentric than gas will excape on oneside before the other forcing the tail to wag. fbs are easy to square while bts are hard to square.
another problem with bts, at the same point as the wag, is that instead of the gasses being blowen away 90 degrees to the bullet like with a fb they are allowed to flow around the bullet creating turbulance infront of the bullet.
fbs have their own problems like excessive drag and pressure build up behind the bullet in ss flight

Last edited by load; 07-21-2010 at 05:52 PM.
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  #12  
Old 07-21-2010, 06:11 PM
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Re: flat base bullets. Why?

In thread starters case, there is also a stability issue. 14twist is got to be the least AND worst there is for 22cal. It leaves BTs 50gr or higher marginally stable at best. Going to FBs 50gr and below, improves stability and grouping..

Here, it's muzzle release quality that marginal twist cannot overcome.
That's my theory

Last edited by Mikecr; 07-21-2010 at 06:15 PM.
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  #13  
Old 07-21-2010, 06:43 PM
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Re: flat base bullets. Why?

i have a custom built .22-250 on a mauser action with a wilson arms barrel and the best results i have had with it is from a 40-grain v-max which is a boattail bullet, i can shoot 1/2 inch groups all day consistently with this too
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