New Weatherby Cartridge

[bmart2622]

Interesting, Weatherby rifles are known for long throats

 

[z987k]

6.5 RPM case length = 2.570
156 Berger Nose Length = 0.765

So if you seat a 156 with the end of the bearing surface right at the mouth of a max length case (not ideal, stuffed deep into the case) you get 3.335" COAL. What SAAMI max is doesn't much matter in that situation.

Ah ok, I see what you're saying.

 

[wind gypsy]

...and a custom reamer...

Why would rebarreling a 257wby with a fast twist barrel require a custom reamer?

The longer throat necessary for the long high BC bullets

Yeah.. I think a custom reamer would probably have a SHORTER throat. Saami spec is 0.378” freebore which is long AF. For context a 133 Berger has 0.447” total bearing surface. I’m not sure any bearing surface would be in the neck to touch lands.

 

[PsRpOiGrRiAtM]

I have to applaud them for at least trying to get past the "bigger, faster, lighter, flatter, etc" to the point of being a little bit contrarian to Roy's initial vision. People have gotten smarter and it seems like Weatherby has too--this (and the rest of the RPM line) is much more in line with current views and trends towards cartridge efficiency, than others (looking at you, Nosler) have been.

 

[bnewt3]

Interesting, Weatherby rifles are known for long throats

Not likely to be that long. A berger 133gr is a full .200" longer than a 110gr ELD-X which is about the longest "traditional" .25 bullet

Long throat is realistically one of the if not the biggest advantage the "modern" cartridges can take advantage of.

 

[bnewt3]

Yeah.. I think a custom reamer would probably have a SHORTER throat. Saami spec is 0.378” freebore which is long AF. For context a 133 Berger has 0.447” total bearing surface. I’m not sure any bearing surface would be in the neck to touch lands.

Can you break that down barney style for me?

 

[Donjuan]

Not disagreeing with you but what two cartridges between 223 and 300win could we not say the same thing about? It's not for me either but it's pretty cool to see a stout fast twisted 25 caliber factory offering.

I can certainly see the appeal and probably targeted customer base. I can think of several people who like to think they have the best.....well everything. They're not going to shoot a box of "shells grin" a year so expensive ammo isn't a problem and will make them feel like it's that much better. Top it off with an expensive Leupold in whatever rings the store has that fits. It won't kick as hard as the last new magnum they brought and they'll hit a little better with it. The gun will become famous on the way back home from the fully guided hunt. So much so he will put a 25 rpm sticker on his truck next to the Leupold sitka and yeti sticker. grin

I like all those products just fine just making a joke

Agreed at standard whitetail ranges it doesn’t matter what you shoot if you put it in the pump house. At longer ranges is probably where these high bc bullets shine. For me, I don’t have any place to shoot farther than 300 so it’s all a moot point. If you do, it probably means western hunting and shooting in a prone position which doesn’t happen much in whitetail country

 

[bmart2622]

Not likely to be that long. A berger 133gr is a full .200" longer than a 110gr ELD-X which is about the longest "traditional" bullet for 25-06.

Long throat is realistically one of the if not the biggest advantage the "modern" cartridges can take advantage of.

I know that the free bore on my 257 wby is gigantic. I cant even sniff the lands with a 110 Accubond. Maybe, you do need a custom reamer and all 3 of the smiths I talked to just happen to have a custom 257wby reamer

 

[Trogon]

Between saum and rpm, which will have better mag options?

Im partial to creedmoor cases simply because I can fit 5 in a short double stack.

 

[bnewt3]

I know that the free bore on my 257 wby is gigantic. I cant even sniff the lands with a 110 Accubond. Maybe, you do need a custom reamer and all 3 of the smiths I talked to just happen to have a custom 257wby reamer

the 110 accubond is shorter than the eld-x so like .220" shorter than the 133. 25-06 and 257 WBY were designed with 110gr class and under bullets.

 

[bmart2622]

the 110 accubond is shorter than the eld-x so like .220" shorter than the 133. 25-06 and 257 WBY were designed with 110gr class and under bullets.

I know

 

[bnewt3]

I know

Soooooo whats the malfunction?

 

[MtnHawker]

Could be a nasty little sucker. Low 70s grain H20 capacity with a 130 class 25 cal would be a slippery SOB with pretty moderate recoil and not as obscenely overbore - fit in standard long actions. Sounds like a winner to me.

Would be pretty similar recoil to 270win/6.5 PRC but should outperform both in drop/drift.

Still reading through the thread so I'm sure most have realized already but you nailed it. I guess my issue so far is that I already have a 270. Inside of normal (400yds for me) hunting distances I don't really see the benefit.

That said I've been itching for a quarter bore for years now. Almost built a 257 roberts Tikka. Still might. I'm really hoping Federals next peak alloy release is a short action high pressure 25. Would be my perfect do all

 

[bmart2622]

Soooooo whats the malfunction?

As I said, none of the gunsmiths Ive talked to or the people I know that have rebarreled 257wby and shoot heavies, have mentioned anything about custom reamers

 

[Montana Slim]

From Ron Spomer's Facebook.

25-06, 25 RPM and the 257 Wby.
View attachment 999579

Just a quick first glance... but does that not look tikka mag-length to anyone else?

 

[bnewt3]

As I said, none of the gunsmiths Ive talked to or the people I know that have rebarreled 257wby and shoot heavies, have mentioned anything about custom reamers

You said 110 AB, not heavy

 

[Justin Crossley]

The 25 CM fits really well in short-action mags and factory Tikka mags. I don't see any reason for this at all.

But, I'm sure they'll sell a bunch of them.

 

[MtnHawker]

I don't doubt it will be a "better" hunting cartridge than the 25CM.

It is my understanding the 25CM was introduced because it fit perfectly into the regulations for some competitions. The fact it was a nice hunting cartridge option is a positive point as well.

If I understand things correctly, the 25 RPM will be too hot for the competitive shoots leaving them with the market size of people who really want a hotrod 25 with a heavy bullet. If that market is big enough, they beat the 25 PRC to market and might benefit from the head start. I am tired of everything new being a Creedmoor or PRC and honestly hope they succeed. I just don't think it will be a big hit.

Plus, I think the next cartridge to attract significant market share is going to be a 6/25/6.5 version of the Backcountry. Whether Federal does it first/best or one of their competitors does it, new high pressure short action cartridges are going to come out soon.

High pressure short action is what I'm waiting for. Cmon Federal. Do something

 

[wind gypsy]

Can you break that down barney style for me?

Below is a SAAMI chamber print. That part that says 0.2574 cyl is the freebore, my math says the cylinder is 0.363 long. after it ends there is a very gradual taper until the end of the throat. The portion of a Berger 133 EH that is full 0.257 diameter is only 0.447” long. Meaning by the time a 133 Berger is out far enough to touch where the throat is tapering down in front of the freebore there will be little to none of it still held by the case neck. IE you’d have to jump a 133 long AF in a saami 257 wby mag chamber.

 

[bmart2622]

You said 110 AB, not heavy

Yep, I have been shooting 110s, its being rebarreled with 7.5 twist to shoot heavies