Has anyone had any experience with a twist rate other than 1-14 for the Lott and 500gr bullets? I sent a rifle out yesterday for rebarreling/action polishing and I am trying to decide on the twist.

Shootaway, if I remember correctly use shoot Swift softs I don't remember the solid you use but I'd stick with the 1-14 twist rate.

Dirk

I would go for a 1-12 or a 1-10" twist. Much better stabilization of long solids, especially at close range..

Do a google search on the web for rifling twist rates there is tons of info.
Here is one site that shows the Greenhill formula for rifling twist rates:

http://www.northeastmoto.com/forums/showthread.php?t=697

And another:
http://kwk.us/twist.html

I would think that a barrel maker would be able to advise you on the best twist rate for any caliber he can make barrels for.

Thanks everyone, but what I want to know is if anyone shot the 500gr bullet with the 14 and 12 or 10 and noticed any difference on paper or penetration.

quote:

Originally posted by dirklawyer:
Shootaway, if I remember correctly use shoot Swift softs I don't remember the solid you use but I'd stick with the 1-14 twist rate.

Dirk

Thanks dirklawyer.It's just that one of the two Swift bullets I recovered does not look that stressed.

quote:

Originally posted by shootaway:

quote:

Originally posted by dirklawyer:
Shootaway, if I remember correctly use shoot Swift softs I don't remember the solid you use but I'd stick with the 1-14 twist rate.

Dirk

Thanks dirklawyer.It's just that one of the two Swift bullets I recovered does not look that stressed.

I have a 1:12" .458/.338 Lapua. Works well with 500-grain monos at 2400-2500 fps, and any other lighter bullets.

I have a 1:14" twist 450 Dakota. Not so good with 500-grain Monos at 2300 fps. Excellent with 450-grain monos at 2500-2600 fps.
Good with stubby 500-grain Woodleighs at 2400 fps.

Like member buffalo, I would use a 1:12" or 1:10" for a serious .458 using any bullet make, weight, velocity considered useful for game.

If I wanted to use strictly 500 to 550-grainers I would go with 1:10".

1:14" is marginal for 500 to 550-grain lead-cored "stubby" bullets, and a poor choice for 500-grain monos, IMHO.

Thanks RIP. Would the Swifts be just as accurate at 100yds with the 12 as they are with the 14?

The twist rate in my 458 Lott that came with it new shoots three bullets 500gr three holes into a supper tight group holes into each other. Using IMR4320 powder.

quote:

Originally posted by shootaway:
Thanks RIP. Would the Swifts be just as accurate at 100yds with the 12 as they are with the 14?

You only have to worry about too fast a twist when you are shooting at 1000 yards.

Inside of 500 yards the accuracy will not suffer from an "over-stabilized" bullet.

Do you think you can keep your shots inside of 500 yards when hunting with the .458 Lott?

That 500-grain Swift is a little longer than the 500-grain Woodleigh. If you rebarrel go to a 1:12" twist for that bullet.

I called Swift and spoke to Bill Hober the President about my problem.He suggested I stay with the 1-14 and try the 450gr bullet.He said there would be less issues with the 450gr and I am still good with the 500gr and the 14 twist.He said the 458's should really be shooting 450gr bullets and the 500gr thing is the americans trying to copy the British 470 500gr thing.He said the A-frame is the best bullet for Africa and the world over!

This for you cz rifle that you shot out in 100 shots while wearing a helmet, after you used a maul to smash the bullets, and cleaned it after every shot to prevent a dirty barrel from cracking the stock, aiming for the shootaway kill zone, after it had been worked over by "a famous gunsmith" amd would no longer hit paper after 120 shots?

Just checking... 1:14 to 1:10, works just fine

quote:

Originally posted by jeffeosso:
This for you cz rifle that you shot out in 100 shots while wearing a helmet, after you used a maul to smash the bullets, and cleaned it after every shot to prevent a dirty barrel from cracking the stock, aiming for the shootaway kill zone, after it had been worked over by "a famous gunsmith" amd would no longer hit paper after 120 shots?

Just checking... 1:14 to 1:10, works just fine

Ditto