25-300 weatherdy
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BuckeyeSpecial
New member
I would guess that 257 Weatherby Magnum loads [from a manual] are the place to start.....
Is it a Weatherby wildcat, or is it the proprietary [factory] Weatherby?
Guessing it's a wildcat version if the case WAS a 300 Weatherby...
Is it a Weatherby wildcat, or is it the proprietary [factory] Weatherby?
Guessing it's a wildcat version if the case WAS a 300 Weatherby...
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Sounds like a great way to burn a lot of powder and probably a barrel too, while only gaining marginally over the results of a standard 257 Weatherby or even the 25-06.
Buckeye's probably got a good place to start, though I think the 300 case might be larger than the 257 Wby case.
I'd find answer that question first.
Buckeye's probably got a good place to start, though I think the 300 case might be larger than the 257 Wby case.
I'd find answer that question first.
Rustydust
Active member
This is a caliber I can just hear the various barrel makers loving people to buy. Talk about a barrel burner!
If you have a need to shoot a 75 grain slug at over 4200 fps then this may be the ticket for you. But as was mentioned earlier, the actual performance increase is not going to be worth it in my book. Be fun though.
A 25/06 is a superb deer round as it is. If you need more killing power then you would be better off to go with a bigger bore rifle than you would with just a faster quarter bore.
If you have a need to shoot a 75 grain slug at over 4200 fps then this may be the ticket for you. But as was mentioned earlier, the actual performance increase is not going to be worth it in my book. Be fun though.
A 25/06 is a superb deer round as it is. If you need more killing power then you would be better off to go with a bigger bore rifle than you would with just a faster quarter bore.
This round would be pretty similar to the 257 STW which is of course the Full length 8mm mag necked down. With a 100 gr barnes tsx 86.0 gr of RL25 is a pretty stout load. (4180 fps -26Inch barrel) Around 80 gr would be a good jumping off point to start. I've got some other data for the 75 gr V-Max and the 120 Partition if your really interested. Lots of fun!
I'd guess the 257/300 Weatherby version would gain about like the 257 STW did - Roughly 100-200 fps per bullet weight- over the standard 257 Weatherby. It's up to the opertor to decide if this gain is worth the cost in powder and barrels steel.
There's a lot of hair splitting in the reloading-wildcatting arena, and guys seem to feel that an extra 100-200 is worth it in other areas. Max performance comes at a price. The question as always is: Does the extra 100 or so FPS make a difference . . .To YOU? The deer ain't gonna care if it's a Roberts or Weatherby. But if YOU care, then it matters.
There's a lot of hair splitting in the reloading-wildcatting arena, and guys seem to feel that an extra 100-200 is worth it in other areas. Max performance comes at a price. The question as always is: Does the extra 100 or so FPS make a difference . . .To YOU? The deer ain't gonna care if it's a Roberts or Weatherby. But if YOU care, then it matters.
257 Weatherby with zero freebore-Pac Nor super match three groove
100g Nosler ballistic tip at 3850 out of a 26" barrel
115 Nosler ballistic tips at 3650 out of a 26" barrel
87g Speers out of a 26" barrel at 4130 fps(imr 4831)
100g SIERRA at 4000 out of a 30" HART 12" twist barrel
R#22 with Federal 215's
------------------------------------------------------------
Custom 25/06, shilen barrel, 12 twist-VERY IMPORTANT
100G SIERRA 63.0g of R#25, win case, Fed 215-3650 fps
117g sierra Flat base 58.0g of R#25, Win case, Fed 215-3350 fps out of the 12" twist Shilen barrel
NOTE: 12 twist will only stabalize the bullets above and lighter. DO NOT try these loads in a 10" twist rifle, start off 10% lighter because speeding up the twist rate does increase pressure.
100g Nosler ballistic tip at 3850 out of a 26" barrel
115 Nosler ballistic tips at 3650 out of a 26" barrel
87g Speers out of a 26" barrel at 4130 fps(imr 4831)
100g SIERRA at 4000 out of a 30" HART 12" twist barrel
R#22 with Federal 215's
------------------------------------------------------------
Custom 25/06, shilen barrel, 12 twist-VERY IMPORTANT
100G SIERRA 63.0g of R#25, win case, Fed 215-3650 fps
117g sierra Flat base 58.0g of R#25, Win case, Fed 215-3350 fps out of the 12" twist Shilen barrel
NOTE: 12 twist will only stabalize the bullets above and lighter. DO NOT try these loads in a 10" twist rifle, start off 10% lighter because speeding up the twist rate does increase pressure.
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KAG
New member
I think if you look slightly in a different area you will find quite a bit of data begin your rough work up. There has been work done including write ups working with the 25/300winmag. Barrels, powder, and twist rates. I think if I remember right they coined this cartridge the 25 Pronghorn or something like that.
I personally think the cartridge would excel using heavier bullets, not lighter ones. Should be a straight forward build and I believe redding or CH4D might offer it in their custom die shop. If its something you want to do, research it and then do it.....no matter what people say.... a wildcatter understands that sometimes the only reason is simply because you need to know....
I personally think the cartridge would excel using heavier bullets, not lighter ones. Should be a straight forward build and I believe redding or CH4D might offer it in their custom die shop. If its something you want to do, research it and then do it.....no matter what people say.... a wildcatter understands that sometimes the only reason is simply because you need to know....
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CastleRocker
Member
I built my Dad a 25-7mm a couple years ago. It's comparible to a 257 Weatherby, should be comparable to this one. We used to make our 257 Weatherby out of 7mm Rem Mag brass. (If you do a LOT of shooting, Rem brass is way cheaper than Wby brass).
I guess for some of us, it's a Quigley Down Under kind of thing; it just shoots "a mite farther, and a mite faster".
My Dad is in his 70's, and his eyes aren't as good as they once were. However, I can tell you one thing for sure, with this rifle, if he can see it and range it, it's DRT Antelope hate it.
Don't worry what others say, if you want it...build it! It WILL be worth it.
I guess for some of us, it's a Quigley Down Under kind of thing; it just shoots "a mite farther, and a mite faster".
My Dad is in his 70's, and his eyes aren't as good as they once were. However, I can tell you one thing for sure, with this rifle, if he can see it and range it, it's DRT Antelope hate it.
Don't worry what others say, if you want it...build it! It WILL be worth it.
Dustballs
New member
You dont build a rifle like this for barrel life or worrying about burning powder. I have a rifle that a friend built on his and his dads version of the 257 STW. I can shoot 100 grain bullets at 4000 fps. I dont care how long the barrel will last when it is gone I will get another one with the same chamber.
Just a note on the 25/300 Weatherby. This would NOT be similar to the 257 Weatherbay or the wildacatts based on the assorted short(standard) mag cases like the 7mm mag, 264, 300Win, etc. This is a full length case and will produce 200-400 fps more speed than the short case, albeit at a higher expense in barrel life and lowder consumption. That is why I included data from my STW as a starting point.
If in fact you were using a 25/300 weatherby, standard 257 weatherby data (And that for it's wildcatt counterparts) might in fact be a dangerous place to start. With the ultra slow powders this round needs to perform; too LITTLE powder can be a dangerous thing. The case capacity of the 257 STW, and a 257/300 Weatherby would be very close. And there is a good deal of data available on the fairly well publicized STW version to work with.
This round and others like it are pretty specialized. But they are fun, fast, and deadly on the critters for which they are best suited. No, there are not efficient. Who cares. If effecient is all that matters, get a 223, a 30-06, a 12 gauge, and a 22 and be done with it. Try not to die of complete efficiency induced boredom.
For those of us who like to occasionally AI something. Or for whom a fast 17 is a joy. Or even those of us who like to occasionally get the snot kicked out of us by some charcoal burning t-rex thumper. Rounds like the 25/300 make perfect sense. Go for it.
If in fact you were using a 25/300 weatherby, standard 257 weatherby data (And that for it's wildcatt counterparts) might in fact be a dangerous place to start. With the ultra slow powders this round needs to perform; too LITTLE powder can be a dangerous thing. The case capacity of the 257 STW, and a 257/300 Weatherby would be very close. And there is a good deal of data available on the fairly well publicized STW version to work with.
This round and others like it are pretty specialized. But they are fun, fast, and deadly on the critters for which they are best suited. No, there are not efficient. Who cares. If effecient is all that matters, get a 223, a 30-06, a 12 gauge, and a 22 and be done with it. Try not to die of complete efficiency induced boredom.
For those of us who like to occasionally AI something. Or for whom a fast 17 is a joy. Or even those of us who like to occasionally get the snot kicked out of us by some charcoal burning t-rex thumper. Rounds like the 25/300 make perfect sense. Go for it.