Anybody seen or shot a 375 WSM wildcat? Wondering what kind of velocity one could expect with 260-270 grain bullets?

it's the 375 jamison
same volume , there fore performance, as a 375 taylor

jeffe

Jeffe, LOGICALLY same volume, same performance, but as can be seen with the .375 H&H vs. .375 Taylor comparison, volume does not always mean performance. That said, if the .375 WSM can push a 260-270g bullet at 2750-2800fps, I think that would be awesome, with LOTS of potential. Anybody out there actually shoot a .375 Jamison/WSM that has chronographed a number of loads? Give me some actual data, please....

MKane160

Blackfoot,
yes I have seen and handled .375WSM wildcat, but no shooting yet.
There is another group of Guys that offer the StalkerSeries of cartridges all based on WSM cases. They have 375,416,458 cal. No mods except necking up, 2.9" load length.
The .375WSM "Stalker" figures they offered were:

270gn@2675
300gn@2475
350gn@2300

I am not agreat fan of WSMs', but of the group, the 416 was the one that apealed the most to me. Funny thing was that the 350gn.416 was quoted at around 2300 as well, I thought being .039" bigger than the 350gn/.375, it would automatically be running faster than the 375 pill of the same weight.

Also something does not make sense about the 375WSM being same capacity as 375T. That would mean that the 300WSM would be the same capacity as the 308NormaMag, yet I dont believe the 308Norma round has to run to a high 63000psi like the WSM has to, to achieve 2960 for the 180gn pill.

quote:

Originally posted by MKane160:
Jeffe, LOGICALLY same volume, same performance, but as can be seen with the .375 H&H vs. .375 Taylor comparison, volume does not always mean performance. That said, if the .375 WSM can push a 260-270g bullet at 2750-2800fps, I think that would be awesome, with LOTS of potential. Anybody out there actually shoot a .375 Jamison/WSM that has chronographed a number of loads? Give me some actual data, please....

MKane160

sure enough... run the pressure up and it can go faster

jeffe

Jim Busha developed two lines of cartridges on what would become the WSM case. His .375 Heavy Express Mag does teh following:

235 gr/3,000 fps
250 gr/2,980 fps
270 gr/2,940 fps
300 gr/2,880 fps

His case used a 40 degree shoulder and 2.25" case length. This data came from a 26" barrel.

jim

Woodjack, do you have a website for the "another group of guys"?

No I am affraid I dont,I threw any litrature that I had out,cause I felt their operation was alittle to primitive/farmyard mechanic style, they could not provide any conclusive ballistic evidence or pressure barrel testing results to show me how they got all the cartridges to achieve the stated ballistics and run at the "claimed" maximum 46000psi. I dont recall them having a website, I would have automatically written it down for future refrence.

The WSM and Jamisons are not the same. The only thing they have the same are shoulder angle and case length. All other measurements are different. Next Jamison will own the RSAUM's too.

quote:

Originally posted by HunterJim:
Jim Busha developed two lines of cartridges on what would become the WSM case. His .375 Heavy Express Mag does teh following:

235 gr/3,000 fps
250 gr/2,980 fps
270 gr/2,940 fps
300 gr/2,880 fps

His case used a 40 degree shoulder and 2.25" case length. This data came from a 26" barrel.

jim

This seems to be a lot of velocity for a .375. It's close to the extremely large .378 weatherby. It's (frankly) hard to believe. Is there a way to confirm this?.....

Maybe this guy is related to P O Ackley?

quote:

Originally posted by RMiller:
The WSM and Jamisons are not the same. The only thing they have the same are shoulder angle and case length. All other measurements are different. Next Jamison will own the RSAUM's too.

Rmiller,
I think we'll agree that a wsm formed case and a jamison are so close that:

Yes, the length and shoulder angle are the same.

and the casehead of course...

and water capacity is within 2 grs on the widest of difference of them

in fact, the nominal water capacity difference is LESS than when you measure norma vs winchester, vs federal 300 winmig brass

and of course, they were determined to be so close that winchester infringed on his patent


and, frankly, if the headstamp were buffed off, you would need digital calipers to sort out which was which...

so, for the purposes of campfire talk, since one couldn't tell them apart without calipers, and the capacities are equal, and the case starts from the same parent (jamison's lawsuit proves at least THAT), then I think we can agree, for at least comparative purposes (we aren't talking reamer swaps) that the jamison and wsm cases are equal...



On the H.E.M. line.. those are from 348 win, not 404 jeffe, and have a larger case capacity, but are run as WSM like pressures

jeffe

quote:

Originally posted by vapodog:

quote:

Originally posted by HunterJim:
Jim Busha developed two lines of cartridges on what would become the WSM case. His .375 Heavy Express Mag does teh following:

235 gr/3,000 fps
250 gr/2,980 fps
270 gr/2,940 fps
300 gr/2,880 fps

His case used a 40 degree shoulder and 2.25" case length. This data came from a 26" barrel.

jim

This seems to be a lot of velocity for a .375. It's close to the extremely large .378 weatherby. It's (frankly) hard to believe. Is there a way to confirm this?.....

Maybe this guy is related to P O Ackley?

Vapodog,

Those numbers are from the Heavy Express loading manual, I took the highest velocity shown for each bullet weight (pressure data not available). It was shot in the Colorado Springs area, so altitude change is significant (6,000 feet). The rifle was a Ruger #1.

jim

Wasn't (isn't?) there a legal problem between Rick Jamison and Winchester for the "WSM" line of cases? I seem to have read something to the tune of it was Jamison who designed/patented the "short fat cases" and Winchester didn't pay him royalties when they marketed the rifle/cases recently (patent infringement).

Not sure if the above this is true-file it in the "internet freely exchanged info"/rumor section.

The trouble with case design/wildcatting, is that just a degree or two of shoulder angle, case taper, or neck dimension change is all you need to get around a design patent.

Other than that, I do like the idea of lobbing a .358/9.3/.375/.416/.458 daimeter bullet from a short fat case. A short action thumper without a belt. Me likey.