What can you covert 7mm Rem Mag to?
- Thread starter beckband
- Start date
7mm Rem Mag is just a cartridge... What action is it on?
If it is a Remington 700 - yes it can be barreled to a .375 H & H or a .375 Ultra Mag.... or a number of Magnums...
If the 7mm Mag is on a "standard length" action, the .375 H & H case may be too long...
You asked converted "back" to... was it a .375 H & H once? More details required...
It's a Savage. The answer is "it depends, but probably". You already have a magnum bolt face, and with a little work the mag box should work, unless it's a DM model. - dan
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Yes, you can but it will be a royal pain. The fixed mag box has slots machined into the action to fit. To go longer, you will need to modify the action and fit the longer mag box.
Consider the 375 Ruger (or the 375 Dakota). Same OAL but fatter case. The Ruger has a magnum case head if memory serves. The Dakota is bigger (??) but you can neck down 338 RUM brass and end up with the same thing with no bolt face mods.
Either should duplicate the 375H&H just fine and require very little mag box tweaking.
Jerry
Consider the 375 Ruger (or the 375 Dakota). Same OAL but fatter case. The Ruger has a magnum case head if memory serves. The Dakota is bigger (??) but you can neck down 338 RUM brass and end up with the same thing with no bolt face mods.
Either should duplicate the 375H&H just fine and require very little mag box tweaking.
Jerry
257 Weatherby or 264 Winchester Magnum...a simple rebarrel on anything that was built as a 7mm Rem Mag
"...375H&H?..." Ever shoot one or look into the cost of ammo? Remington .375 H&H brass, alone runs $42.95Cdn per 50. $58.95Cdn per 20 for loaded ammo. Hornady 270 grain bullets run $29.95 per 100. 300 grain RN bullets run $29.95 per 50.
You'd definitely have mag length and action length issues. The 7mm max OAL is 3.290". The .375 H&H OAL is 3.600". 350 thou difference in the case length alone. No changing the bolt face, but I suspect the action is too short.
You'd definitely have mag length and action length issues. The 7mm max OAL is 3.290". The .375 H&H OAL is 3.600". 350 thou difference in the case length alone. No changing the bolt face, but I suspect the action is too short.
If you want to go up, why not consider 358 Norma Magnum? With my limited knowledge I assume that it is significantly easier than moving to 375 H&H. Ammunition and brass are obtainable, and performance gets you relatively close to what you're looking for.
.375 Belted H&H Magnum
The famous .375 Belted H&H Magnum (.375 H&H Mag. to Americans) was the first belted magnum cartridge, but not the first belted cartridge. The latter honor goes to the .400/.375 Belted Nitro Express, introduced in 1905 by Holland & Holland. The rimless, belted case design was intended to provide a positive edge for headspacing, like a rim, and yet still feed easily from the box magazines of repeating rifles. It was, of course, a very successful idea.
Holland & Holland refined and enlarged the belted case and in 1912 introduced the seminal .375 H&H Magnum, which spawned a rash of popular belted magnum cases. The .375 Magnum case has a .532" rim diameter and this has become the standard rim diameter for standard (.30-06 length) and long (.375 H&H length) magnum cases.
Strangely, despite their diversity and number, few of the long magnum cartridges have been very successful in the marketplace. Today only the original .375 H&H and the .300 Weatherby, probably the best seller among the full length magnums, enjoy much popularity. Among the small bore calibers, the .275 is dead and the .244 H&H, .300 H&H and 8mm Rem. Magnums appear to be on the way out. The 7mm STW had a modest run of popularity that appears to have waned, although it is loaded by all of the major U.S. ammo manufacturers. Probably its propensity to burn-out barrels has not helped its reputation.
The medium and big bore magnums have their place as specialty cartridges and it is here that the big case magnums make the most sense. Unfortunately, few game animals require such cartridges and even fewer shooters can tolerate their outsized recoil. Those factors definitely limit their sales appeal. Factory loaded cartridges based on the full length .375 H&H case include:
.244 H&H Magnum
.275 H&H Magnum*
7mm STW
.300 H&H Magnum
.300 Weatherby Magnum
8mm Remington Magnum
.340 Weatherby Magnum
.375 H&H Magnum
.375 Weatherby Magnum
.400 H&H Magnum
.416 Remington Magnum
.458 Lott
.465 H&H Magnum
The widespread adoption of the .375 H&H case with its big .532" rim diameter provided a big increase in powder capacity compared to 8x57 and .30-06 size cases, but the 3.600" COL of the .375 H&H cartridge required a special long action that some manufacturers did (and do) not build.
Considerable demand developed for standard (.30-06) length cartridges based on a shortened (and blown-out) .375 H&H case. Many of these cartridges have achieved factory loaded status, and the 7mm Rem. Mag. became the best selling of all magnum cartridges, followed by the .300 Win. Mag. and the .338 Win. Mag. These three are in the top 10 on cartridge sales lists, the only magnum cartridges ever to attain that status. The 7mm Rem. Mag. made our short list of all-around rifle cartridges (see the article "All-Around Rifle Cartridges" on the Rifle Information Page) and the .338 Win. Mag. is the premier Western elk and Alaskan CXP3 game cartridge.
Most of the standard length magnums are reasonably healthy. Only the 7x61 S&H Super is obsolete and the critical list is limited to the Norma pair. Here are the standard length belted magnum cartridges derived from a shortened .375 H&H case:
.257 Weatherby Magnum
.264 Winchester Magnum
.270 Weatherby Magnum
7x61 Sharpe & Hart Super*
7mm Remington Magnum
7mm Weatherby Magnum
.308 Norma Magnum
.300 Winchester Magnum
.338 Winchester Magnum
.358 Norma Magnum
.458 Winchester Magnum
In the mid-1960's Remington went the rest of the boys one step farther by introducing a pair of true short action (.308 length) magnum cartridges based on an even shorter version of the .375 H&H case. These 6.5mm and .350 caliber cartridges did not catch on, although the .350 Rem. Mag. became a cult classic in Alaska as a "guide rifle" cartridge for protection against the great bears as well as a Guns and Shooting Online favorite. (See the article "Guns and Shooting Online Rifle Cartridges" on the Rifle Information Page).
The Remington short magnums seemed to be obsolete when the less well balanced WSM and SAUM cartridges hit the market in 2000 with much media fanfare. The hype surrounding the squat WSM cartridges, which were not based on the .375 belted case, revived interest in Remington's original short action magnums, giving them a new lease on life, so here they are:
6.5mm Remington Magnum
.350 Remington Magnum
Both of Remington's original short magnums are back in production as I write these words and Remington and Ruger are offering new factory built rifles in .350 Rem. Mag. caliber.
The famous .375 Belted H&H Magnum (.375 H&H Mag. to Americans) was the first belted magnum cartridge, but not the first belted cartridge. The latter honor goes to the .400/.375 Belted Nitro Express, introduced in 1905 by Holland & Holland. The rimless, belted case design was intended to provide a positive edge for headspacing, like a rim, and yet still feed easily from the box magazines of repeating rifles. It was, of course, a very successful idea.
Holland & Holland refined and enlarged the belted case and in 1912 introduced the seminal .375 H&H Magnum, which spawned a rash of popular belted magnum cases. The .375 Magnum case has a .532" rim diameter and this has become the standard rim diameter for standard (.30-06 length) and long (.375 H&H length) magnum cases.
Strangely, despite their diversity and number, few of the long magnum cartridges have been very successful in the marketplace. Today only the original .375 H&H and the .300 Weatherby, probably the best seller among the full length magnums, enjoy much popularity. Among the small bore calibers, the .275 is dead and the .244 H&H, .300 H&H and 8mm Rem. Magnums appear to be on the way out. The 7mm STW had a modest run of popularity that appears to have waned, although it is loaded by all of the major U.S. ammo manufacturers. Probably its propensity to burn-out barrels has not helped its reputation.
The medium and big bore magnums have their place as specialty cartridges and it is here that the big case magnums make the most sense. Unfortunately, few game animals require such cartridges and even fewer shooters can tolerate their outsized recoil. Those factors definitely limit their sales appeal. Factory loaded cartridges based on the full length .375 H&H case include:
.244 H&H Magnum
.275 H&H Magnum*
7mm STW
.300 H&H Magnum
.300 Weatherby Magnum
8mm Remington Magnum
.340 Weatherby Magnum
.375 H&H Magnum
.375 Weatherby Magnum
.400 H&H Magnum
.416 Remington Magnum
.458 Lott
.465 H&H Magnum
The widespread adoption of the .375 H&H case with its big .532" rim diameter provided a big increase in powder capacity compared to 8x57 and .30-06 size cases, but the 3.600" COL of the .375 H&H cartridge required a special long action that some manufacturers did (and do) not build.
Considerable demand developed for standard (.30-06) length cartridges based on a shortened (and blown-out) .375 H&H case. Many of these cartridges have achieved factory loaded status, and the 7mm Rem. Mag. became the best selling of all magnum cartridges, followed by the .300 Win. Mag. and the .338 Win. Mag. These three are in the top 10 on cartridge sales lists, the only magnum cartridges ever to attain that status. The 7mm Rem. Mag. made our short list of all-around rifle cartridges (see the article "All-Around Rifle Cartridges" on the Rifle Information Page) and the .338 Win. Mag. is the premier Western elk and Alaskan CXP3 game cartridge.
Most of the standard length magnums are reasonably healthy. Only the 7x61 S&H Super is obsolete and the critical list is limited to the Norma pair. Here are the standard length belted magnum cartridges derived from a shortened .375 H&H case:
.257 Weatherby Magnum
.264 Winchester Magnum
.270 Weatherby Magnum
7x61 Sharpe & Hart Super*
7mm Remington Magnum
7mm Weatherby Magnum
.308 Norma Magnum
.300 Winchester Magnum
.338 Winchester Magnum
.358 Norma Magnum
.458 Winchester Magnum
In the mid-1960's Remington went the rest of the boys one step farther by introducing a pair of true short action (.308 length) magnum cartridges based on an even shorter version of the .375 H&H case. These 6.5mm and .350 caliber cartridges did not catch on, although the .350 Rem. Mag. became a cult classic in Alaska as a "guide rifle" cartridge for protection against the great bears as well as a Guns and Shooting Online favorite. (See the article "Guns and Shooting Online Rifle Cartridges" on the Rifle Information Page).
The Remington short magnums seemed to be obsolete when the less well balanced WSM and SAUM cartridges hit the market in 2000 with much media fanfare. The hype surrounding the squat WSM cartridges, which were not based on the .375 belted case, revived interest in Remington's original short action magnums, giving them a new lease on life, so here they are:
6.5mm Remington Magnum
.350 Remington Magnum
Both of Remington's original short magnums are back in production as I write these words and Remington and Ruger are offering new factory built rifles in .350 Rem. Mag. caliber.
