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257 PRC (300 PRC necked to .25)

If you really want to up the ante?

Something on the Lazzaroni line of cartridges.
Something like the 7.21 (7mm) Tomahawk necked to 6.53 (257).

Or something based on the 378 Weatherby?

I could possibly keep my screen name building a 7mm-378 Weatherby... ;)
 
A 257 PRC should be really close to the 257 Banshee,( 257 - 6.5x68s improved) I had a Banshee built maybe 15-20 years ago and it's been a deer slayer way out yonder. I haven't shot it in years due to where I hunt now with the ranges are less than 200 yards but H1000 and Retumbo are great powders in it and should be in the 257 PRC. Good Luck on the project!
 
B23 said:
The 257 STW was a fairly popular 25cal hot rod for awhile and a 25-300PRC would be damn near a ballistic twin to that.

I don't know what the brass is like but if you have a standard bolt face long action to build off of, like say a LA Rem 700, necking down the Weatherby 6.5RPM to .257 would probably make for a pretty sweet setup and not cost a whole lot to build. I don't know if anyone makes bushing dies for the 6.5RPM but if they do that would be an easy way to go.

And, since you're a fan of the 284 anyway the 6.5 RPM is basically a stretched out 284 case. A 257 RPM would have pretty much identical case capacity of a 257 Weatherby but on a standard bolt face action and no belted case.

I know Kirby Allen did a couple different hot rod 25 cals. one was built off the 300 Dakota case and the other used 338RUM as the parent case but they all were "improved" variants with Kirby's shoulder angle and case taper. I'm not sure what they were or where he got them but he was shooting some really heavy 25cal bullets if I recall they were 156's. He used 28-30 inch barrels and slowwwww powders like H870 and US869. I don't know what the BC was on those 156's but it was pretty high and if I recall he was launching them 3300-3400fps and the 115-120's were leaving the barrel at 3800.

Something that overbore would probably be a good test for one of Bartlein's 400modbb barrels that's supposed to last longer.
Click to expand...
I take a 25 284 win sizer die and use it to neck down 6.5 wrpm brass full length resize with a 6.5 wrpm sizer with the decaping rod out
 
You come up against a wall with useable powder capacity. More powder doesn't equate to more speed let alone more accuracy. Just less barrel life and less $$$. For an example I have a 25 and 6.5 based off the 8X68S case. Just a little bit less capacity than the PRC. Blown out and 30 degree shoulder. Disappointing with the small bores. The 6.5 almost worked and the 7MM did. 180's at 3100FPS and accurate. Google 257 Banshee and 25 STW BUT don't believe everything you read.
I do own a 257 Wby that I love.
 
B23 said:
The 257 STW was a fairly popular 25cal hot rod for awhile and a 25-300PRC would be damn near a ballistic twin to that.

I don't know what the brass is like but if you have a standard bolt face long action to build off of, like say a LA Rem 700, necking down the Weatherby 6.5RPM to .257 would probably make for a pretty sweet setup and not cost a whole lot to build. I don't know if anyone makes bushing dies for the 6.5RPM but if they do that would be an easy way to go.

And, since you're a fan of the 284 anyway the 6.5 RPM is basically a stretched out 284 case. A 257 RPM would have pretty much identical case capacity of a 257 Weatherby but on a standard bolt face action and no belted case.

I know Kirby Allen did a couple different hot rod 25 cals. one was built off the 300 Dakota case and the other used 338RUM as the parent case but they all were "improved" variants with Kirby's shoulder angle and case taper. I'm not sure what they were or where he got them but he was shooting some really heavy 25cal bullets if I recall they were 156's. He used 28-30 inch barrels and slowwwww powders like H870 and US869. I don't know what the BC was on those 156's but it was pretty high and if I recall he was launching them 3300-3400fps and the 115-120's were leaving the barrel at 3800.

Something that overbore would probably be a good test for one of Bartlein's 400modbb barrels that's supposed to last longer.
Click to expand...
You are right about barrel life and a good test for the Bartlein. Would be an expensive toy but all of us need somthing to spark us.
 
284winner said:
My reamer is the 25-284, not the 25 PRC. I'm helping a buddy with his 257 Weatherby while doing a 300 PRC improved currently for myself. I'm comparing brass on the 300PRC and 257 WBY. Very close to the naked eye. Just a curious why I haven't heard anyone building a 25 caliber on the 300PRC case. Seems like a pretty easy task necking down the brass and good brass available as well. Apparently we've reinvented the wheel with the 300PRC while still having the 300WM. It's pretty much the same as doing a 25-300PRC while having the 257 WBY still going strong. It may turn into more than just an itch.
Click to expand...
I know this is an old thread but why go to the trouble when you have the severely overbore factory original 257 Weatherby Magnum?
 
DaveTooley said:
I did a wildcat on the 8X68 case years ago. Similar to the 25 Banshee. You reach a point of diminishing returns quickly. I did. Same with a 6.5 on that case. Sometimes more powder is just more powder.
Click to expand...
Dave
Did you have the variety of powders now available? I used to get about 3400 with a 120gr in a wby with standard ( nonwby chamber). Throat erroded about 3/8" in 500 rounds. I suspect your wildcat would be faster with.less than.1000round barrel life
 
wboggs said:
Dave
Did you have the variety of powders now available? I used to get about 3400 with a 120gr in a wby with standard ( nonwby chamber). Throat erroded about 3/8" in 500 rounds. I suspect your wildcat would be faster with.less than.1000round barrel life
Click to expand...
I used Rl22
 
BTDT with the 245Wby. It's like the fiery red head you dated in college for a really great time.... you're not likely to bring her home to meet the family OR marry her, lol.
I am hearing that the PRC brass is not all that strong/uniform and some guys I know are favoring the Nosler over the PRC. Anyone care to comment ?
 
TheMolyBulletMan said:
I know this is an old thread but why go to the trouble when you have the severely overbore factory original 257 Weatherby Magnum?
Click to expand...
260/6.5 CM, 220 swift/22-250, 280/284. They all are so close, why have both. It's just what gun guys, shooters and hunters like doing. Not sure there is a particular reason other than because we can. Certainly nice that we have options isn't it ?
 
Anchorite said:
BTDT with the 245Wby. It's like the fiery red head you dated in college for a really great time.... you're not likely to bring her home to meet the family OR marry her, lol.
I am hearing that the PRC brass is not all that strong/uniform and some guys I know are favoring the Nosler over the PRC. Anyone care to comment ?
Click to expand...
How high do you want to run pressues? It is my impression you can get very stromg PRC brass, at least as strong as Nosler.
 
wboggs said:
How high do you want to run pressues? It is my impression you can get very stromg PRC brass, at least as strong as Nosler.
Click to expand...
BTDT with 2 different 257Wbys in years past. Love the Bee, but as I've aged, I've slowed down and moved toward efficient cartridges anymore.
 
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