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barrel options

 
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  #1  
Old 11-02-2007, 12:35 AM
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Location: NC
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barrel options

if you were to build a wildcat in a short action .25 cal that could lauch a 120gr bullet at 3200+fps what twist rate would you use... barrle length..
also would it have a short or long throated chamber.. ?
i would have in mind to use it for a part bench an varmint
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  #2  
Old 11-02-2007, 03:45 AM
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25/284

Hi look at the 25/284. You will get 25-06 performance in a short action have a wyats extended mag box fitted to a Remington action and you will be good to go.

Cheers Bill
Australia
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  #3  
Old 11-02-2007, 08:14 AM
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Hi Bill using a 243/308 case , whats a wyats ?

if you were to build a wildcat in a short action .25 cal that could lauch a 120gr bullet at 3200+fps what twist rate would you use... barrle length..
also would it have a short or long throated chamber.. ?
i would have in mind to use it for a part bench an varmint

open on suggestions......... Thanks
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  #4  
Old 11-02-2007, 09:37 AM
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The standard twist rate for factory 25-06 is 1-10 , I have heard some guys can shoot the long Berger bullets but some can't so I think that the 1-10 is right on the brink of minimum amount of twist for these long high BC bullets. I do know some guys that shoot the 120gr class hunting bullets with no trouble out of their 25-06.

What kind of bullets are you planning to shoot out of this rig , the long high bc or the shorter hunting type? As for barrel length , I'd say that you'll need at least a 26" to get that velocity out of that small of a case , I would probably opt for a 30" and then cut it back later if you need to. i think you may be working with some high pressures if you able to get 3200fps out of a 308 case with a 120gr bullet in the .257 bore.

The Wyatt's box is an extended magazine box that allows you to seat your bullets out a good bit further to allow more room in the case. I highly recommend that anybody building any type ofr long range gun in either long or short action have a Wyatt's box installed especialy if your using a 284 case in a short action.

Are you dead set on the .257" bore ?? for paper punching and varmints the 243 and the Ackley improved version are awsome rounds out to 1000yds as is the 260 and 260 improved with 95-140gr bullets. I only mention this because of the limited amout of quality match bullets for the quarter bore.
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  #5  
Old 11-02-2007, 09:12 PM
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Cases

Hi the twist I would use is 1in9 so the 120gr Bergers will definitely stabalise.

As for cases an improved 308case will noy get you there safley. 257Roberts improved will only push a 100gr at 3200fps abd it is a lot larger.

You will need a 284case necked to 25cal to do it in a short action. This will duplicate 25-06 ballistics. I also think you will need a barrel at least 26" long to get the velocity.

Hope this helps your gunsmith should know about fitting Wyats mag boxes.

Cheers Bill
Australia
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  #6  
Old 11-03-2007, 12:47 AM
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Join Date: Oct 2007
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well i had hopes of putting togeter a 25 souper improved improved' 45* shoulder an the wall is blown out to .461-2, rather then necking down a 308 case it seems to be easier to neck up a 243 case with a 257 die an then form fire it to the chamber but i just got back some speaks from a friend who put it on the quick load program it reaches 54000psi an at max gets me to 3100 fps with a burger 120 ..re19 / 48.5 out of a 23-1/2" barrel , have no idea where the col will be,the data is only program generated the reamer we located has a lead to throat .106 i think that includes free bore the neck will be short on the case,, so how far i can stick out the bullet i won't till it was put together[ if i go this route]
most of the info came from a pre built winchester i'll be working with a 700 remington action which as a recest bolt face i don't know if the winchester has a flat face or not... would make a difference ?

on the Wyats magazine does the action have to be machined? to make the box fit

i just mite be better putting together a 6m br... i really wanted this souper deal
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  #7  
Old 11-03-2007, 05:48 AM
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25 Souper

Hi if you want the 25 souper get it built. forget aboul getting 3200fps and settle with whatever velocity you get. The wyats mag box requires the action to be machined back where the space between the trigger and the rem mag box cutout. it is a simple machining operation and I would definatley do it. Get the 9 twist barrel I recommend Lawton Barrels they areamasing in their finish and they shoot unbelievably well without fouling exsesivly.

As for the cases if you are moving the shoulder foreward use Lapua 308 cases they can be sized in one operation in your sizing die. Buy your cases and dies then make up spme cases seat the projectiles to your maximum oal then send one to Dave Kiff and have him grind your reamer to suit.

On the neck diameter have 1.5 thou clearence on each side off the neck making it 3 thou larger than the measured neck of your dummy cartridge. For your throat make tne frebore .2571" don't go bigger this will be the most accurate you can have it. Make then neck length around the projectile diameter .257 and the shoulder can be up to 60 degrees. I have 1 reamer a 338 on the 300 ultramag case with the 60 degree shoulder and have a match 7mm on the 270WSM case being made at the moment.

I would look at H1000 and H4831SC as the prefered powders and stay away from double based powders as they are less effected by temperature variations. Also use the CCI BR2 primers as they work verry well with the above powders.

Get a 28-30" barrel from Barney and you will have a beautiful cartridge and great long range rifle for medium game. There are also plenty off projectiles around the 117gr to 120gr weight to make this worthwhile.

But if you are set on 3200fps the 284 case is a better option.

Cheers Bill
Australia
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