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haiku_rodney
Joined: 03 May 2006
Posts: 100
Location: Maui, Hawaii
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| Posted: Wed Mar 14, 2007 1:38 pm Post subject: Lee R.E.A.L. bullets |
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| After 18 years of sitting in the closet, I have dusted off my 50 cal flintlock. I used to shoot patched round balls exclusively. I am thinking using the Lee REAL bullets. Has anyone had any experience with these bullets? My flintlock has a 1 in 66" twist. Would the 250 grain or the 20 grain bullet be a better choice? |
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ADKBEAR
Joined: 16 Sep 2003
Posts: 662
Location: Central NY
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| Posted: Thu Mar 15, 2007 5:07 am Post subject: |
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HR
Have never shot the Lee bullets, so I cannot help you there. The best thing to do is get some and do some paper punching. I think that with that slow of a twist your bullets are going to tumble and that a patched ball will be a better option. You never know tho. My 50 cal flinter has a very slow twist but a very long barrel and though I just shoot patched balls out of it I have put some power belt bullets through it and they shot very good. I did attribute this to a longer barrell the bullet had more time to stablize, don't know if it is true???? |
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HuntAway
Joined: 04 Jan 2007
Posts: 1
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| Posted: Thu Mar 15, 2007 5:49 pm Post subject: |
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The following was taken from another site.
http://home.insightbb.com/~bspen/math.html
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Bullet Stabilization An elongated bullet flying through the air without spinning will be unstable and inaccurate. The longer the bullet is in relation to its diameter, the more spin is required to stabilize it. How much spin is required? This relationship is expressed in the Greenhill formula, a simplified verson of which is:
150 x diameter squared divided by bullet length = required spin
Example for a .45 caliber bullet .60 inches long:
150 x .45 x .45 divided by .60 = 50.6 inches
So, for the example bullet, a spin rate of 1:50.6 or faster is required
The formula can also provide us with the maximum bullet length which can be stabilized by a given barrel twist. The formula becomes:
150 x diameter squared divided by twist rate
Example for a .50 caliber barrel of 1:48 twist:
150 x .50 x .50 divided by 48 = .78 inches
The barrel will stabilize a bullet .78 inches long, or shorter.
©1997 B. E. Spencer |
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JTapia
Joined: 21 Aug 2003
Posts: 758
Location: Florida,USA
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| Posted: Thu Mar 15, 2007 6:10 pm Post subject: |
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Welcome HuntAway.
Thats some useful info you have posted. I'll add those formulas to my lil book.
Thanks for sharing. |
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haiku_rodney
Joined: 03 May 2006
Posts: 100
Location: Maui, Hawaii
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| Posted: Thu Mar 15, 2007 9:29 pm Post subject: |
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| Thanks for the info. When I run the calculation, I think I will be able to shoot the 250 grain R.E.A. L. |
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Ironwood
Joined: 17 May 2007
Posts: 43
Location: East Texas
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| Posted: Sun May 20, 2007 11:07 am Post subject: |
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Rodney I think the 250 grain REAL may shoot well in your 1-66 twist rifle. I have a TC Pennsylvania Hunter with a 1-60 twist barrel and the 320 grain REAL doesn't shoot well at all. It's more like a pattern than a group. I haven't tried the 250 grain REAL since I have a .50 caliber CVA ST Louis Hawken with a 1-48" twist barrel and it shoots the 320 grain REAL great.
If you are thinking about getting into bullet casting you might want to get the combination Lee mould that cast a 250 REAL bullet and a .490 roundball. MidSouthShootersSupply has about the best price on Lee moulds. The price for the combination mould is only a couple dollars more than the single cavity mould. |
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