Maxi Ball Specifications: Length

[OldSmoky1967]

Hello, I have a .54 Green Mountain Barrel with a 1 in 66" twist. I am interested in trying Maxi Balls in it. Can anyone tell me the length of the .54 Maxi, so I can use the Greenhill formula to calculate if it will stabilize in my rifle? Thanks!

 

[bubba.50]

Don’t know the specs or what a ‘Greenhill Formula’ is but they shot great in my 54cal Lyman Great Plains rifle.

 

[OldSmoky1967]

Don’t know the specs or what a ‘Greenhill Formula’ is but they shot great in my 54cal Lyman Great Plains rifle.

Glad to hear that. Isn't that barrel a fast twist, like 1 in 28"? Mine is a 1 in 66". Thanks!

 

[mooman76]

Conicals are not a standard length. You might want to try the Lee REALs. They are made fat and short to better stabilize in slower twist barrels. Each caliber is available in in two different sizes.

 

[bubba.50]

Glad to hear that. Isn't that barrel a fast twist, like 1 in 28"? Mine is a 1 in 66". Thanks!

No sir. The Great Plains Rifle has the same roundball twist as your Green Mountain barrel. The Great Plains Hunter is the one that has the fast twist barrel.

 

[longcruise]

I think the GM 54 is more likely a 1:70 twist. Older GPR 54s were 1:48 then they switched to 1:60. Not sure they ever did 1:66.

 

[nkbj]

Hello, I have a .54 Green Mountain Barrel with a 1 in 66" twist. I am interested in trying Maxi Balls in it. Can anyone tell me the length of the .54 Maxi, so I can use the Greenhill formula to calculate if it will stabilize in my rifle? Thanks!

Greenhill might not help you much. The lube grooves are so big that the weight is reduced. That'll throw off assumptions made in a Greenhill calculation. The bullet shortens in order to perform its proper functions so that might throw off the calculations depending upon how hard you slap its behind. If you can find some give them a try. Try at short range and long. The dispersion will probably not be the same minute of angle.

 

[Old Hawkeye]

Hello, I have a .54 Green Mountain Barrel with a 1 in 66" twist. I am interested in trying Maxi Balls in it. Can anyone tell me the length of the .54 Maxi, so I can use the Greenhill formula to calculate if it will stabilize in my rifle? Thanks!

Maxi-Balls are not likely to stabilize in a 66 twist. They were intended for use in 48 twist. Go shoot them & see! Then let us know! That would be more fun than doing a math equation.

 

[Maven]

Hello, I have a .54 Green Mountain Barrel with a 1 in 66" twist. I am interested in trying Maxi Balls in it. Can anyone tell me the length of the .54 Maxi, so I can use the Greenhill formula to calculate if it will stabilize in my rifle? Thanks!

If you have the mould and the Maxis, I'd just try it, with an over powder wad of some kind: w5 yd. at first; 50 yd. later. You'll know right quick whether it works in your bbl.