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flat base bullets. Why?

 
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  #1  
Old 06-30-2010, 07:06 PM
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flat base bullets. Why?

My 22-250 shoots better with flat base than boat tails. The gun is a H&R ultra varmint that I won in a lottery. It has a 24 in tube and a 1-14 twist. 50 gr nosler bt's shoot a 1.5 grp. 55 gr rem and 36gr barnes vg's
( both flat base) shoot a 1/4 in. grp. Is this normal or the twist rate? I am new to the 22 cal center fire
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Old 06-30-2010, 09:27 PM
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Re: flat base bullets. Why?

I have the same issue with a 22-250 i won also , maybe its the price we paid. I was told some guns dont like bt, i dont know but i always did have trouble getting a ballistic tip to shoot good when every else got it to work.
mike
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Old 06-30-2010, 09:33 PM
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Re: flat base bullets. Why?

Most custom bullet makers will tell you that it is much easier to get a FB bullet more uniform that a BT bullet, ergo the FB bullets tend to shoot better at the shorter distances.

BH
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Old 06-30-2010, 09:39 PM
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Re: flat base bullets. Why?

7 Loader, Bryan Litz, Berger Ballistician, in his book; "Applied Ballistics For Long Range Shooting" makes several comments about boat tail bullet design vs flat base. He also comments on the Nosler boat design in particular, which he believes is not an efficient design, too steep an angle. In general terms flat base bullets are marginally more accurate over short to medium distances and boat tails are more efficient beyond say 500yds I think. Sorry I don't have the book in front of me, someone may wish to correct me.
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Old 06-30-2010, 09:47 PM
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Re: flat base bullets. Why?

Quote:
Originally Posted by 7 loader View Post
My 22-250 shoots better with flat base than boat tails. The gun is a H&R ultra varmint that I won in a lottery. It has a 24 in tube and a 1-14 twist. 50 gr nosler bt's shoot a 1.5 grp. 55 gr rem and 36gr barnes vg's
( both flat base) shoot a 1/4 in. grp. Is this normal or the twist rate? I am new to the 22 cal center fire
Flat based bullets are best at shorter distances .And boat tailed bullets are better at longer
distances because the BCs are almost always higher making them more stable at these long
distances.

If you are shooting at 100 yards try 400+ with both boat tailed bullets an flat base bullets
and I think you will find out what bullet to use.

I use a lot of flat based bullets for short range because of accuracy and the boat tail bullets
are not nessary.

A lot of bench rest shooters use flat base bullets at the 100 and 200 yard matches.

I dont know the exact reason for this phenomenon but some say it's because the bullet exits
the crown cleaner with less blow by at that exact moment.

Maybe one of the bullet smiths will shed some light on the reason.

So shoot what shoots best at the distance you plan to shoot.

J E CUSTOM
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Old 07-01-2010, 10:02 AM
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Re: flat base bullets. Why?

Maybe a slight correction ---100% of the COMPETITIVE short range (point blank) BR folks use flat base. I use 66.7 gr FB in my 6BR and 6PPC and 142 gr SMK's in my 6.5x284 1K BR rifle.
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  #7  
Old 07-01-2010, 11:49 AM
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Re: flat base bullets. Why?

Flat base bullets release from the muzzle cleaner, providing more consistant POI up close.
But with any real distance in wind, less accurate but higher BC bullets will provide better results.
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