Need Help 257 STW

Albert Johnson

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I'm thinking about building a 257 STW on a Voere action to be used for a hunting rifle, if you have some experiance with this cal let me know. I want to know good or bad, I can take it. Thanx for the Help. Dave
 
why not build a 257RUM ..it will fit in the same mag box length , if you're gonna burn powder why not BURN POWDER

Aren't you getting to a point of diminishing returns? Correct me if I am wrong but a 6.5-06 AI will pretty much out-do a .264 Win Mag, and with less case capacity.

AJ - is that an M98 Voere or a Titan II?
 
why not build a 257RUM ..it will fit in the same mag box length , if you're gonna burn powder why not BURN POWDER


The ultramag case is really a waste with any bullet smaller than .308".I have two 7mmstw's and a 7mmultramag and the ultramag only produces 50fps to 75fps more than the 7mmstw's.
 
Aren't you getting to a point of diminishing returns? Correct me if I am wrong but a 6.5-06 AI will pretty much out-do a .264 Win Mag, and with less case capacity.

Comment:
Not a chance that this is true, in this world or the next. The 264 wins, hands down every time. More powder capacity = more velocity, all other things being equal. Regards, Eagleye
 
Not a chance that this is true, in this world or the next. The 264 wins, hands down every time. More powder capacity = more velocity, all other things being equal.

Well I have no experience with either. What I did see is that in Nosler's #4 the .264 only beats the 6.5-06 by 60fps with a 125gr Partition. I thought that the A.I. version would make up for that. With other bullet weights the .264 has ~100fps advantage.

I hope Boonerbuck reads this, I think he has a 6.5-06 AI with chronographed data.

And about more capacity = more velocity: don't you start getting issue with a cartridge being over-bore, and then your extra powder is just wasted?
 
I can't think of a circumstance, i.e. powder-bullet combination where more capacity (powder) would not equal the potential for more velocity. Certainly there are diminishing returns, but that wouldn't come to a point where adding more powder did not increase velocity. I have seen a string of shots each going up by one grain, where a shot produced a bit higher velocity than the next shot that contained one grain more. That's explained by the natural highs and lows of any load which can be say +/- 15 fps (the lower charge goes on the high end and the higher charge on the lower end). When I repeated the loads and shot five of each, the average was always higher with more powder. I have observed a given amount of powder in a smaller case produce more velocity than the same amount of powder in a larger case, but that's a pressure thing. Try comparing the velocity of a given bullet using 50gr of powder in a 30/06 with the same 50gr of the same powder in a 300 Win Mag - the '06 will outrun it. Then try it with 70gr. But wait, you can't stuff 70 gr in an '06. :wink:

The Wildcat guys are notorious for exagerrating claims, but more so for loading up way past safe pressures and comparing to a non-Wildcat's max published load which is well within pressure - not apples and apples. There are many examples, one being good old Gibbs who claimed his 30 Gibbs could match the 300 Win Mag - complete BS.
 
There is a new 25 cal on the block in which I was a co-designer.It is called a .257 Allen magnum.It's parent case is a 338 ultra mag that is blown out.It is getting 3350+fps with a 156grain ultra low drag bullet We have found that this cartridge will beat the 25 stw by 150 fps consistantly.These velocity's are with a 30 inch barrel and it is a must to use ball powder.If any one is interested in these or the others in this family I can provide all velocity data.The newest cat is a 338 lupua necked down to a 277 shooting 185 grn uld bullets
Bulletsmith
 
These velocity's are with a 30 inch barrel and it is a must to use ball powder.

And what if you use a 26" barrel? How would it compare to the STW then? Just out of curiosity.
 
You're looking at making your own brass by necking down 7mm STW(runs $27.99Cdn per 50 from Wholesale Sports). Midway wants $35.19US for 20 and $79.89US with a 90 day plus wait for a sizer die. RCBS sells die sets, but not cheaply. From their Custom Shop, I think.
This cartridge uses a lot of powder too. 80 plus grains for most bullet weights. Sure does move though. A 90 grain Sierra HPBT bullet, for example, runs at 3884fps. It'll be a barrel burner.
 
Dan,
this is a completely new line of cartridges co-designed with Kirby Allen out of montana.
they are all based on long barrels and heavy bullets, they go from a 224 all the way up to a 50 cal.
Albert Johnson-another one to consider is the 25-300 winchester mag.I have one and the own the chamber reamer .It has a 26.5 inch gain twist barrel and 100 grn bullets will beat the 4000 fps mark.This is the cartridge that got me into building bullets.I have all sorts of data on this one and there is alot on accurate reloading.com
Bulletsmith
 
I happen to own two custom built 25's one is a 257 Weatherby & the other is a custom 25 STW & I am here to tell you the difference between the 257 STW & the 257 Weatherby is the difference between the 257 Weatherby & the 25-06 this is in a well built rifle shooting handloads. P.S. if you are worried about burning powder & being efficient shoot a 22(LOL)
 
besides some VLD semi-custom match bullets, 25 caliber bullets usually have pretty mediocre Ballistic CoEfficients, when compared to the next caliber up, 6.5mm

a 120 gr. Nosler Partition has a BC of .391
a 115 gr. Nosler Ballistic Tip has a BC of .453
a 110 gr. Nosler Accubond has a BC of .418
a 115 gr. Barnes Triple Shock X has a BC of .429

and now take a peek at some 6.5mm BCs

a 120 gr. Nosler Ballistic Tip has a BC of. 458
a 140 gr. Nosler Partition has a BC of .490
a 130 gr. Barnes Triple Shock X has a BC of .487
a 140 gr. Barnes XLC has a BC of .522

if you're gonna be burning all that powder, wouldnt it make most sense to top the load off with a bullet that can whistle at long range and slice through the wind well??

a 6.5mm STW would make more sense IMO. In 25 cal I see little use of anything larger in capacity than a 25-06 AI.

My .02
 
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