300 WM necked to .25 cal?

I haven't, but it looks good. It appears to run close to
the 257STW while using a good bit less powder. I currently
use a 25-06AI that is a little slower than the 257Wea, but
not enough to matter. This 25-300 has some appeal. Reloaders
nest list several loads & they are close to 257STW if safe!
 
thanks alot guys! that looks GOOD! i think i'm gonna make one? why not? do you think the recoil would be very bad? i dont think so. looks like it would put the thumping on a deer!
 
I can look it up in the 50 year old PO Ackley book and see what it is called. I did, it is called the .25 Ackley Magnum. He felt it was badly overbore. I am sure a barrel burner. If you do not have the action, look at the 25 souper. .308 cartridge necked to .25 or the fine old 257 Roberts (or the improved version) or better still the .250 Savage Improved.
 
If it were me(but it isn't, it's you!) I'd build it on a WSM rather than a WM. A little less powder used, slightly less "overbore", short action,no belt, etc,etc. Either way, go for it! More powder, more barrels, more gunsmiths fees, that helps our sport and the economy!!!! Enjoy!
Let us know what you build and how it performs, good luck!
F1
 
migth want to have a couple extra barrels sitting around. I don't see that throat lasting long at all, not even 1000rnds. IF,...IF,..you can have it twisted fast for use with heavy bullets so you can run H1000, RL25, Retumbo, AA8700, US 869 etc and you may be able to keep temps down as well as pressures while still making top speeds.

If I were gonna burn that much powder out that little hole,..I'd also call Kirby Allen and order some of those ULD bullets he is designing. They will sit back in the case enough to use up some of the volume, while being heavy enough to allow slower powders to be used as well.
 
well my friends uncle has a gunsmithing shop, and this guy does amazing work, and i get like a family discount thing so i mean if it burned up a barrel or needed some work it might just be worth it. the wsm looks inviting, i really dont like the belt, and it would use less powder and probly give close to the same velocities?

another question, has anyone necked up a wssm case to accept a .308? or 7mm?

thanks again for the help
 
The WSM will run close to the same (sharper shoulder partially responsible for this) velocity. I would lean more towards the 25-06AI which will be marginally slower, but last majorly longer. Or run the WSSM case, but you will lose some speed on that one,...that is of course if you are looking for top speed.

If not, think about the 257rbts Imp. That is highly efficient with all the power you need to be shooting anything with a 25cal bore.

if you really want to torque them up,...257RUM loaded with 8700 or the new US869 or retumbo.
 
If you to go with such screeming velocity choose your
bullets carefully. Most conventional slugs will blow-up
like a varmint bullet at those velocities.
 
No smart a$$ intention meant... just a legitimate question to a question, perhaps overly ponderous on my part though! Perhaps you know something I don't, I'm open to learning something here, but I cannot think of an advantage of a 7mm or 30cal wildcat based on a wssm case when compared to existing cartridges. With a wssm case you'd have reduced mag capacity, reduced powder capacity when compared with existing cartridges that would also work in a short action, greater potential for feeding problems, short case neck requiring greater seating depth, which would reduce case capacity, etc.
There are no dumb questions, and I didn't think of yours as such, but if there's something I'm missing, I'm open to enlightenment!
F1
 
i was jsut wondering if the COAL of the wssm if you could shoot it out of an AR or something? cuz ive seen the 300 fireball or whatever it was? and that was a necked up 221. FB to a 308? so i was jsut wondering if anyone has done that witha wssm?
 
The 25 WSM has been around for a while and I see no advantage for it over other rounds available. Brass is hard to work with because it is so thick. The 6mm and 6.5 WSM rounds are real screamers too! All will be hard on barrels if you shoot them alot. An easier way to go is shoot the 115gr Sierra HP's in the 270 WSM or neck down the 270.

On the 7 or 30 WSSM, the 30 verison is popular in the Hunter class of some matches shot. However, I see no advantage to any of these rounds. The problem is the good match bullets when seated are deep in the case reducing powder capacity.
 
The topic seems to be bouncing around, but concernig the WSSM in a 7 or 30, as stated before it would give us nothing. If you want an fast 30 AR, look into the AR10 in 300SAUM. Just a 308 AR10 would be more logical than the WSSM.

Concerning the writings of P.O. Ackley, they are great & many things apply today, but not the overbore issue. The powders have changed drastically & make these comments irrelevant for the calibers he spoke of including the 25-06AI.

Your original post indicated you wanted one of the faster
25's. As stated before, I feel the 25-300WM would offer some advantages over the 257STW & the loads I have seen are quite close to the STW with less powder & fit more actions.
I would much rather work with the 300WM brass than 257Roy also & with this one you could load to top end 257 Wea. velocity & have less pressure, better case life & similar
bore life to the Roy & step it up when you want to. Another round you could look at is the 257 Allen Mag, with a fast twist barrel, you can get about 3,400FPS with a 156 Gr. Wildcat bullet, yea, I said 156 Grain. Concerning barrel life, you can start this 25-300 with a 28-29" barrel & after barrel wear, set the barrel back & re-chamber & do this 2-3 times. Have your gunsmith keep the reamer for this & the per time charge will not be that huge.

As for me, the 25-06AI gives me the velocities I was after, 3,550-3,600 for the 100gr., 3,375FPS for the 120 Part., 3,250 for the 125 Gr. Wildcat. These speeds & bullets do what I want, in fact the 125 now does it all for me because at 500 or so it starts outperforming the light Varmit slugs & really kicks but in the wind. That is just my view, but if you want more speed, that is your business & good luck!! /ubbthreads/images/graemlins/grinning-smiley-003.gif
 
I'm a PO Ackley fan but, The powder we have avalible today compared to what they had 50 years ago. I would say go for it on the 25-300 Win Mag. I've been looking into a 6.5 STW but, haven't jumped in on it yet. Over bore or not it will produce some serious figures with todays powders.
 


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