Those old guns were beauty's!!!!
Need re-chamber ideas for old Mk V 9 lug 270WbyMag
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OP, The Easy button on the tried and true with no miss match between the reamer and dies, with no issues on the Cartridge overall length and magazine length
extremely accurate, and great brass(AGD) is available also, but no flies on Winchester or Remington brass, a testimony of just how accurate this cartridge is:
7 Rem Mag-.210 freebore instead of the SAAMI freebore of .110 for the 175-180s on elk. Pac Nor can do this job for you.
26" 9 Twist barrel
175g at 2850 fps with R#22, cci 250
175 at 3050 fps with R#26, Federal 215
Both of these shoot groups less than 3/8" at 100 yds
150-154G AT 3200 with R#25 and Win Mag primers, shoot groups sub 3/8"
I killed two bulls with 140g Noslers at 3250 fps, a very top-end load of IMR 4350, Rem brass, Rem 9 1/2
sub 3/8" groups where the bullets were just barely touching the lands. Both Bulls flopped on bullet impact, one never even kicked a hind leg, the other kicked a hind leg once or twice, but neither even made the slightest effort to get up, DRT!
The 28 Nosler shoots the 175g-180g at 3100-3150 fps, and the 160ish at 3200-3350, equal to the 7 STW in all ways.
I have had all three, I am sticking with the 7 Rem Mag with a 27" #5 contour barrel where the word Accurate is an understatement, Not to mention the ease of load development, pick a bullet!
I have had several of the 257 Weatherby with very short freebore where the 100g are doing 3850 fps, shooting tiny bug holes,
110g Accubonds and 115g Bergers are doing 3600, all with amazing accuracy with very little recoil, using a Gentry muzzle break.
You see the bullet impact the animal, water vapor fly off the animal, and bullet impact many times after the bullet exits the animal.
A friend killed 6 Bulls with his Mark 5 using 117g Factory ammo, then a guide told him it was NOT an Elk round. He then got a 6.5/284 but the bulls started running off where previously they flopped. Again, Pac Nor can do the job on the 257 Weatherby with very short freebore.
OP, Consider having a switch barrel made for your Weatherby, very easy to do as the gunsmith sets the headspace, you just screw them on and off like Lug Nuts. Many consider the 30 calibers preferable to anything, but recoil goes up substantially unless you use a good Tactical type of muzzle break. The lowly 300 Winchester with a 200g is heavy-duty elk medicine, but the recoil is over my tolerance level.
extremely accurate, and great brass(AGD) is available also, but no flies on Winchester or Remington brass, a testimony of just how accurate this cartridge is:
7 Rem Mag-.210 freebore instead of the SAAMI freebore of .110 for the 175-180s on elk. Pac Nor can do this job for you.
26" 9 Twist barrel
175g at 2850 fps with R#22, cci 250
175 at 3050 fps with R#26, Federal 215
Both of these shoot groups less than 3/8" at 100 yds
150-154G AT 3200 with R#25 and Win Mag primers, shoot groups sub 3/8"
I killed two bulls with 140g Noslers at 3250 fps, a very top-end load of IMR 4350, Rem brass, Rem 9 1/2
sub 3/8" groups where the bullets were just barely touching the lands. Both Bulls flopped on bullet impact, one never even kicked a hind leg, the other kicked a hind leg once or twice, but neither even made the slightest effort to get up, DRT!
The 28 Nosler shoots the 175g-180g at 3100-3150 fps, and the 160ish at 3200-3350, equal to the 7 STW in all ways.
I have had all three, I am sticking with the 7 Rem Mag with a 27" #5 contour barrel where the word Accurate is an understatement, Not to mention the ease of load development, pick a bullet!
I have had several of the 257 Weatherby with very short freebore where the 100g are doing 3850 fps, shooting tiny bug holes,
110g Accubonds and 115g Bergers are doing 3600, all with amazing accuracy with very little recoil, using a Gentry muzzle break.
You see the bullet impact the animal, water vapor fly off the animal, and bullet impact many times after the bullet exits the animal.
A friend killed 6 Bulls with his Mark 5 using 117g Factory ammo, then a guide told him it was NOT an Elk round. He then got a 6.5/284 but the bulls started running off where previously they flopped. Again, Pac Nor can do the job on the 257 Weatherby with very short freebore.
OP, Consider having a switch barrel made for your Weatherby, very easy to do as the gunsmith sets the headspace, you just screw them on and off like Lug Nuts. Many consider the 30 calibers preferable to anything, but recoil goes up substantially unless you use a good Tactical type of muzzle break. The lowly 300 Winchester with a 200g is heavy-duty elk medicine, but the recoil is over my tolerance level.
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Whatever you pick, go with something with market support for parts. About the closest thing in performce that is readily available would be the 28 nosler or possibly the 7 prc. If you're used to the high velocity and prefer that, id rock the 28 nosler. If you're good with a little less launch, the 7 prc is a well balanced cartridge thatll do everything most guys need.
7 prc, 28 nosler, 7 rem mag all available, as well as brass if you roll your own.
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Well I bought a 7mm PRC, but I still want a 7mm Weatherby in a 8.5-9 twist rate.
Be sure you get the freebore on that 7 Weatherby shortened!
Varmint Hunter
Well-Known Member
Keep it classic. Rebarrel in 300WBY. You could even have Weatherby do the work and maintain its original character.
justincase
Member
That sure sounds like a fast twist for such a high velocity bullet….
justincase
Member
That sure sounds like a fast twist for such a high velocity bullet….
Aussie Hunter Steve
Well-Known Member
Mine is 1 in 8. I mostly shoot 142gr ABLR but it also shoots light bullets just fine.
archeratlrg
Well-Known Member
I don't know that I buy into that. Having guided for Oregons big Roosevelt for nearly 40 years, I will say that I witnessed more 1 shot kills on them from a 270 Winchester and 130gr bullets than any other cartridge. I always recommend the 130gr Nosler Partition.
Lefty7mmstw
Well-Known Member
fast twist 7stw or 7rum...
Idaho Lefty
Well-Known Member
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I've hunted with, the .270 Weatherby Mag for over 20+ Years, ( awesome Cart ) but Today,..
I'd Re-barrel / Chamber in, .270 WSM ( Same bbl. Contour, as your rifle now, in a Brux for, a "good" carry weight ) 26", 1-8 twist, IF, wanting to shoot the "Heavies" ( 165 -170's ) or, 1-9.5 to 1-10 tw. for, the AWESOME, 140 Berger Classic's at, 3,200 FPS or, more !
The 140 Berger Cl. Hunt., at, 3,200 FPS, kills Elk,.. like, the "Hammer of, Thor" with, a good Hit ( it's Flat and,.. Fast ! )
But, the 7 SAUM or, 7 PRC, would also BE,.. very Nice, too ! IMO,. .300- .338 Mag's are, NO Longer "needed" for Elk, with, TODAY's,.. Bullets / speeds.
WHY put up with, the Extra, Recoil !
I'd Re-barrel / Chamber in, .270 WSM ( Same bbl. Contour, as your rifle now, in a Brux for, a "good" carry weight ) 26", 1-8 twist, IF, wanting to shoot the "Heavies" ( 165 -170's ) or, 1-9.5 to 1-10 tw. for, the AWESOME, 140 Berger Classic's at, 3,200 FPS or, more !
The 140 Berger Cl. Hunt., at, 3,200 FPS, kills Elk,.. like, the "Hammer of, Thor" with, a good Hit ( it's Flat and,.. Fast ! )
But, the 7 SAUM or, 7 PRC, would also BE,.. very Nice, too ! IMO,. .300- .338 Mag's are, NO Longer "needed" for Elk, with, TODAY's,.. Bullets / speeds.
WHY put up with, the Extra, Recoil !
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Calvin45
Well-Known Member
I recommend a good
Something about "PRC" and "classic old weatherby Mark v" just feels WRONG going together.
It's your rifle, do as you like, but my opinion is a classic weatherby rifle really ought to be chambered in a classic weatherby cartridge. The .270 weatherby is so underrated and THE first big game cartridge Roy weatherby designed. It has panache, flair, swagger, an unrivalled cool factor or air of mystery about it.
Twist it faster and it's a monster for sure.
The 7mm weatherby is good one too, what the 7mm rem mag should have been but isn't. About the same capacity, totally trashes it ballistically because of the appropriate freebore and higher SAAMI chamber pressure.
this.
Something about "PRC" and "classic old weatherby Mark v" just feels WRONG going together.
It's your rifle, do as you like, but my opinion is a classic weatherby rifle really ought to be chambered in a classic weatherby cartridge. The .270 weatherby is so underrated and THE first big game cartridge Roy weatherby designed. It has panache, flair, swagger, an unrivalled cool factor or air of mystery about it.
Twist it faster and it's a monster for sure.
The 7mm weatherby is good one too, what the 7mm rem mag should have been but isn't. About the same capacity, totally trashes it ballistically because of the appropriate freebore and higher SAAMI chamber pressure.
7 Rem Mag should have been the 7 Mashburn, IMO
