let me rephrase
how does a 270 Wby Mag get a 300 fps edge over a 270WSM, all things being equal?
Sorry, I was a bit inebriated and forgot to add the
270wsm sako
- Thread starter mackillan
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Sorry, I was a bit inebriated and forgot to add the
let me rephrase
how does a 270 Wby Mag get a 300 fps edge over a 270WSM, all things being equal?
All things will never be equal as the WBY has more case capacity. I'm just going by my manuals, which show the WSM top out at ~3200, and the wby tops out at 3500. Obviously they use different powders.
.270 WBY 130gr - 76gr IMR 7828 - 3500 fps - 53000 CUP
.270 WSM 130gr - 61gr H414 - 3235fps - 62700 PSI
These are the fastest loads shown...
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I have Sako 75 S.S in 270WSM love this rifle and caliber. Very accurate and extremely flat shooting using TSX 130gr.
I do not like the feel or looks of newer Sako 85. I not sure about new A7 never seen one at our local gun store yet.
I do not like the feel or looks of newer Sako 85. I not sure about new A7 never seen one at our local gun store yet.
Flatter shooting makes for increased accuracy. Would you use a 22 short on sheep?
Flatter trajectory does not necessarily make for increased accuracy,what it does do is reduce the amount of holdover necessary as well as reducing wind drift.Both of these can be compensated for without a reduction in accuracy.
No, not really. Predictable tragectory increases accuracy. The accuracy killer with making a bullet shoot "flatter" is recoil and burning more powder than necessary to get the bullet downrange, which is the case with most cartridges tagged as "magnum"
The most efficient cases have the most predictable trajectory which yield the most accuracy. Of course there are other factors but this is it in a nutshell.
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In the field if one cant predict distance perfectly one of the facors involved in accuracy is being minimized. Even if one could predict distanc one doesnt have a computer brain to adjust ones aim and one cannot do 3 inces high etc with perfect accuracy. If a bullet had no trajectory then obviously accuracy in the field would be increased. Predictability iis of course another factor. They are both factors. /ngDraw;2850851]No, not really. Predictable tragectory increases accuracy. The accuracy killer with making a bullet shoot "flatter" is recoil and burning more powder than necessary to get the bullet downrange, which is the case with most cartridges tagged as "magnum"
The most efficient cases have the most predictable trajectory which yield the most accuracy. Of course there are other factors but this is it in a nutshell.[/QUOTE]
The most efficient cases have the most predictable trajectory which yield the most accuracy. Of course there are other factors but this is it in a nutshell.[/QUOTE]
Not without a computer brain they cant.
You don't need a computer brain with the right optics.If you are using a laser rangefinder,you know the exact yardage.If you know the trajectory at that yardage,you can precisely dial it in with your turrets.Or you can use a calibrated reticle to more accurately establish holdover.
If you don't have a calibrated reticle,and don't use turrets,you are only guessing at the holdover,whether it be 10" or 12".If you misjudge the holdover by 2" the point of impact will still be 2" off whether the holdover was supposed to be 10" or 12".If you misjudge the windage by 2",it will still be 2" off whether you meant to allow 4" or 6".
The only advantage more velocity will provide,is that with less wind drift and less bullet drop,if you hold dead on and ignore windage and bullet drop,you will miss by less.
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We do agree here but what you have described is a computer brain. Im looking at the rapid z 800
All things will never be equal as the WBY has more case capacity. I'm just going by my manuals, which show the WSM top out at ~3200, and the wby tops out at 3500. Obviously they use different powders.
.270 WBY 130gr - 76gr IMR 7828 - 3500 fps - 53000 CUP
.270 WSM 130gr - 61gr H414 - 3235fps - 62700 PSI
These are the fastest loads shown...
I mean all things being equal like barrel length, bullet weight, chamber pressure etc
Nosler #6 shows a 60 fps edge for the 270 Wby with 130 grainers, but it has a 2" longer test barrel
Barnes #4 shows a 150 fps edge for the Wby with same length test barrels
so on average, 100 fps advantage for the 270 Wby Mag over the WSM. That is not 300
I compare cartridges using the barrel length normally found on rifles in that chambering.Most 270wby rifles are sold with 26" barrels,while most wsms are sold with 23" or 24" barrels.How would you compare the 7mmwsm with a 7mmRUM when they aren't sold with the same length barrels?
Nosler is very conservative with the wby,rum and stw cartridges compared to other cartridges.My Nosler #4 manual has a 300win mag with a 24" barrel producing more velocity with a 165gr bullet than a 300 wby with a 26" barrel using the 165gr same bullet.I am comparing the fastest loads for each cartridge.Common sense should tell a person that something is wrong with that data..
I mean all things being equal like barrel length, bullet weight, chamber pressure etc
Nosler #6 shows a 60 fps edge for the 270 Wby with 130 grainers, but it has a 2" longer test barrel
Barnes #4 shows a 150 fps edge for the Wby with same length test barrels
so on average, 100 fps advantage for the 270 Wby Mag over the WSM. That is not 300
Different manuals, different results. Hodgdon has the same results that I posted. Anyway you look at it, the WSM doesn't trump the WBY, contrary to what was posted by Sheephunter...
If Winchester wants to trump the WBY, they'd need to put it in a 26" or longer barrel...
Different manuals, different results. Hodgdon has the same results that I posted. Anyway you look at it, the WSM doesn't trump the WBY, contrary to what was posted by Sheephunter...
If Winchester wants to trump the WBY, they'd need to put it in a 26" or longer barrel...
Its long action counterpart would be the .270 Winchester in the eyes of the American buying public so contrary to the words you put in my mouth, the 270WSM does out perform its long action counterpart....the 270 Win.........
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The 270wsm is marketed as a magnum,so I naturally assumed that it's long action counterpart would also be a magnum,the 270wby.
Of course the 270wsm out performs the non magnum 270win.After all,it is a magnum.
I just looked over Winchesters old catalogues on their site and the marketing deal was in fact pitting the WSM against the WCF...which is kinda ###...
The 270wsm is marketed as a magnum,so I naturally assumed that it's long action counterpart would also be a magnum,the 270wby.
Of course the 270wsm out performs the non magnum 270win.After all,it is a magnum.
X2
No doubt this is the reason why the 270WSM out sells the rest out of the WSM line, It is the only Magnum with a .277 bore size that is readily chambered by the manufacturers ouside of Weatherby.
Everyone loves the Magnums.
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You might assume that Stubble but the American consumer doesn't. The .270 Weatherby is far from mainstream U.S.A. and the .270 WSM was and always has been compared to the .270 Win in marketing. Fair? Of course not because the .270 Win is not a Mag but in the eyes of the consumer the .270 WSM offered something the others didn't...better performance over its long-action counterpart. Funny, no one ever compares the 300 or 7mm WSM to the Weatherby calibres
Selling guns isn't about performance it's about marketing and the .270 was easy to market because it out performed the .270 Win. The .300 was easy to market because it was one of those magic short mags that made for lighter guns, more accuracy and less recoil plus it was big enough to make guys feel comfy in grizz country. The 7mm lacks ### appeal and it's metric!
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Its long action counterpart would be the .270 Winchester in the eyes of the American buying public so contrary to the words you put in my mouth, the 270WSM does out perform its long action counterpart....the 270 Win.........
Why? Would you compare the .300 WSM to a .30-06?
