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????

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

Welcome HuntAway.
Thats some useful info you have posted. I'll add those formulas to my lil book.
Thanks for sharing.

Thanks for the info. When I run the calculation, I think I will be able to shoot the 250 grain R.E.A. L.

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.