bullet expansion vs velocity


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padd54
October 31, 2009, 12:05 PM
I am trying to determine min. fps needed to expand the bullets I am using in my 256win mag.

Where can I find this info?

Thanks,
Ray

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Radaray
October 31, 2009, 01:00 PM
Try the website of the bullet manufacturer that you're loading. They will provide load information for most of their bullets. As an example, Hornady adds a little slip of paper in their boxes that give a range of velocity for their XTP bullets that should give adequate expansion.

longdayjake
October 31, 2009, 01:56 PM
You do realize that those bullets are going to go VERY fast for like 400 yards right? How far are you going to be shooting?

padd54
October 31, 2009, 03:04 PM
Thanks, I did email the various bullet manufacturers, still awaiting responses.

I doubt the 256win mag. can push the rem. 86g fn out to 400yrds and be useful. I am waiting for my Chrono to arrive so that I can check on velocities.

Thanks,
Ray

longdayjake
October 31, 2009, 03:36 PM
Ah, I was thinking .257 weatherby. Sorry about that.

Ol` Joe
October 31, 2009, 10:44 PM
Most 25 cal bullets 75gr and over are intended for larger cartridges such as the 250 Savage, 257Rbts etc. I doubt the 256 will drive them fast enought to expand reliably past 100 yd if that.
I would call the maker of the bullets you plan on useing and see what they recommend prior to purchasing any. IIRC the cartridge was originally loaded with 60 gr bullets at ~24-2500 fps from a rifle..closer to the old 25-20 then the various 25s of today.

fireman 9731
October 31, 2009, 11:44 PM
What bullets are you using?

Most lighter varmint bullets will expand at fairly low velocities.

Seedtick
November 1, 2009, 12:43 AM
Hey Ray,

I'm not familiar with the .256 win mag so I googled it and found an interesting little read by Chuck Hawks. I don't know if it will help you any but here is the link in case anyone wants to read it.
Linky (http://www.chuckhawks.com/256Win.htm) :)

ST

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