Forgotten Rifle Calibers.
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Old 12-09-2010, 09:06 PM   #1
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Default Forgotten Rifle Calibers.

.240 Weatherby Magnum


Introduced in the Mark V rifle in 1968, the .240 Weatherby Magnum was the last of a dozen cartridges introduced while Roy Weatherby was alive. Physically, the .240 bears a strong resemblance to the British designed .240 Apex or .240 Belted Nitro Express as it is more commonly called. With a rim diameter the same as that of the .30-06, the Weatherby cartridge is suitable for any rifles with standard action lengths.

The .240 Weatherby Magnum represents about all the powder capacity that can be utilized with a 6mm bore with any degree of efficiency. When the 6mm Remington and the .240 Weatherby are loaded to maximum chamber pressures in barrels of equal length, the larger case will push all bullet weights 100 to 150 fps faster. Like other cartridges of low expansion ratio, the .240 needs a long barrel in which to reach its impressive performance.

The .240 Magnum is an excellent compromise in performance. Its relatively small bore size allows the use of lightweight bullets at extremely high velocity on varmints without excessive recoil, yet with a trajectory that will give any .224" centerfire a run for its money. Loading a 90 to 105 grain bullet in the Big Six transforms it into a fine deer and pronghorn cartridge.

With the exception of light, varmint weight bullets, powders of slow burning rate offer the best performance in this cartridge. Excellent choices are H4831, H450, and IMR-4831. With the lighter bullets H414, H4350, IMR-4350, IMR-4320, and H380 are better choices.

Historical Notes:

The 240 Weatherby was added to round out the Weatherby proprietary magnum line in 1968. It differs from other 6mm's in having a belted case with somewhat greater powder capacity. It is very similar to the 240 Belted Rimless Nitro Express introduced by Holland & Holland around 1923. Thus far, it is available only in the Weatherby Mark V bolt action rifle or through custom gunsmiths. It is an excellent cartridge and will push the 100 grain 6mm bullet with about 300 fps greater muzzle velocity than the 6mm Remington and around 400 fps faster than the 243 Winchester. However, a considerable portion of this ballistic advantage results from increased barrel length and loading pressure. It is important to allow plenty of barrel cooling time with this, and all, high intensity cartridges. It is a more effective deer and antelope cartridge than the other two. The principal detraction regarding the 240 Weatherby Magnum is that ammunition is expensive and difficult to find outside of the large cities. The 240 case has about the same capacity as the 30-06 and the rim diameter is also the same.

General Comments:

The 240 Weatherby is the most powerful of the 6mm cartridges. It represents the maximum performance that one can squeeze through a 6mm tube with modern powders. The 244 H&H Belted Rimless Magnum, based on necking down the 375 H&H Magnum case, will hold more powder but doesn't produce any improvement in ballistics. The late Roy Weatherby built a successful proprietary gun business on the basis of good product plus the all-important element of ballistic one-upmanship. The weatherby magnum cartridges have traditionally offered higher velocity and energy than their standard factory counterpart. The 240 was born of this same tradition. Of course Remington, Winchester, Norma, et al have their own magnum line in various calibers, and Winchester offered the 300 and 375 H&H Magnums before WWII. However, Roy Weatherby was the first to really popularize this British innovation in the U.S. He convinced the American shooters that it was something they truely needed. For the hunter who must have that extra edge in a 6mm rifle, the 240 Wetherby Magnum is the cartridge of choice.
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Old 12-09-2010, 09:32 PM   #2
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7x61mm Sharpe & Hart


The 7x62mm Sharpe & Hart was developed by the well known handloading authority Phil Sharpe in Collaboration with Richard F. Hart as a high velocity7mm suitable for all North American game. It achieved factory production in 1953 in rifles produced by the Danish firm of Shultz and Larson. Ammunition is now produced by Norma.

Based on an experimental French 7mm military cartridge Sharpe discovered as an ordinance officer in WWII, the commercial version of the cartridge was belted and features a very abrupt shoulder angle of 44 degrees. It's power falls between the standard 7mm's and the 7mm Weatherby and more recent 7mm Remington Mag.

The following the 7x61 S&H once enjoyed has been far outstripped by the 7mm Rem Mag. The older cartridge remains, however, a respectable performer.
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Old 12-09-2010, 09:35 PM   #3
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.25-20 Winchester (25-20 WCF)


Prior to the introduction of the .22 Hornet in 1930, a Winchester Model 92 in .25-20 was considered to be just the ticket for varmint shooting. Introduced during the mid 1890'2, the .25-20 is one of the few cartridges to survive the transition from black to smokeless powder. This fine, mild mannered little cartridge simply refuses to die. In addition to the Winchester and Marlin lever action rifles, the Winchester Model 43 bolt action was available in this chambering from 1949 until it was discontinued in 1957. During the 1950's, Sako also chambered a few L46 rifles for the .25-20, mostly for the Australian market.

Even during the ages of supper-zappers, there definitely is a market for rifles in .25-20 among American shooters. Kimber once chambered a few of its Model 84 rifles for this cartridge, and Browning produced a few Winchester Model 92 reproductions in .25-20. The only standard production rifle presently available in .25-20 is the excellent little Marlin Model 1895CL.

The.25-20 has put its share of venison in larders during its day, but it is no deer cartridge by any stretch. It is, however, a fine turkey cartridge and destroys very little of the eating part of a big gobbler. If the .25-20 is suitable for hunting any four legged creature larger than the groundhog, it is probably a potent enough cartridge for javalina.

The only readily available jacketed bullets suitable for handloading the .25-20 for the lever action rifles with tubular magazines, are the 60 grain Hornady and the 75 grain Speer. Both are of flat nose form, but the cannelure on the Speer makes it a better choice for lever action . Other bullets of spitzer form can be used in bolt action rifles but should never be used in rifles with tubular magazines. Actually, the owner of a rifle in .25-20 can live happily ever after with cast bullets, and a number of molds are available from several sources. H4227 is an excellent powder for the .25-20 WCF.
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Old 12-09-2010, 09:40 PM   #4
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5.6x57mm RWS


The 5.6x57mm cartridge was created by RWS in Germany for hunting small deer such as roe deer, and for chamois. The calibre has a significant following among European sportsmen, and most European mass production riflemakers chamber several models of rifle for this cartridge. During the 1970-1990 period this cartridge was widely and successfully used in the Republic of Ireland for deer shooting, since security considerations at a period of Provisional Irish Republican Army violence had led to a ban on the civilian ownership of calibres larger than .224in. Some British small deer specialist hunters use the 5.6x57mm with great success on roe, muntjac and Chinese water deer.
With a factory-load velocity of 3,500 ft/s (1,100 m/s) with a 74-grain, cone-pointed bullet, it is approximately 100 ft/s (30 m/s) faster than the .220 Swift cartridge firing a bullet of equivalent weight. The larger case capacity means that handloaders can produce 50-grain loads that, with velocities in excess of 4,100 ft/s (1,200 m/s), will outpace anything that can safely be achieved by the Swift. There are no dimensional or ballistic differences between the 5.6x57mm round and the 5.6x57mmR round, other than that the latter is rimmed.
The 5.6x57mm cartridge case has a distinctively thick case wall, and this causes significant problems when handloading, owing to the force that needs to be used through the press when re-sizing the case neck. It has been suggested that this unusual neck thickness is the result of the use of .22 rimfire chamber adapters in centrefire rifles chambered for this cartridge.
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Old 12-09-2010, 10:09 PM   #5
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Chart out the ballistics for the 257 Roberts, 100gr., at modern factory CUPs. They are really impressive especially considering size and economy of the round.

I have one barreled on an old Mauser action and a hand finished stock and I'm very happy with it.

I think remington tried to get people excited about it with the 700 a few years back, but no luck

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Old 12-09-2010, 10:29 PM   #6
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Interesting stuff, thanks tango.

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Old 12-09-2010, 11:01 PM   #7
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tango if you dont already have them you should find copies of ackleys reloading books, two volumes but there is so much in there and so many different cartridges, my favorite but the most useless it the 22 eargasplittnloundencaboomer.

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Old 12-09-2010, 11:05 PM   #8
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Quote:
Originally Posted by Logan2302 View Post
Chart out the ballistics for the 257 Roberts, 100gr., at modern factory CUPs. They are really impressive especially considering size and economy of the round.

I have one barreled on an old Mauser action and a hand finished stock and I'm very happy with it.

I think remington tried to get people excited about it with the 700 a few years back, but no luck
I think you are thinking of the 700 Classic, which Rem does every year. They did their .257Roberts and it was one of the best sellers of the Classic.

It is a great round.
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Old 12-10-2010, 12:19 AM   #9
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If I build a 7mm long range gun I may look real hard at the 7x61mm It is right there with the bigger mags but not so hard on the shooter. It offers more than a 280 or 7mm-08.

There are so many forgotten cartridges out there.

My dad has the Ackly books as he father was a major player in the bench rest scene in CA many many years ago.

I seen one cartridge in some old obscure book my dad has that had 3 different necks on it. They were all stacked up.

Then you get into some of them Flanged rounds and they get right goofy looking.

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Old 12-10-2010, 02:14 AM   #10
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hey those stepped cases kept me entertained when i got tired reloading and wanted to screw around, they were fun to do, if i remember right when i formed my improved zippers from the 30 30 it was a step and then you fire formed it. A bunch of dies and some old brass, cheap entertainment to say the least.

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