Anyone familiar with this chambering? I guess H&H brought it out in the 1920's or 30's and capacity is very similar to Remington's 7mm. I believe it actually uses a .284 bullet. I've only seen one comparison of it to other cartridges and though it doesn't seem to offer anything that other 7mm's don't, it does appear to be the grandfather of the 7mm Magnum, though never popular. Seems like it would be a great custom rifle project chambering. Any info is appreciated.

My books show developed in 1911-12, belted version for bolt rifles and flanged version for doubles and singles shots. Factory loads included 140 gr. SP at 2650 fpas, 160 gr. SP at 2700 fps, 175 gr. SP at 2680 FPS. Barnes says with modern powders can do anything the 7mm Mag. does. I'm thinking of building a 300 H&H bolt gun just to have something a little different, a 275 H&H would be a nice little number to go with it. Do you know if cases are available?

browningguy,
Your research is much better than mine. My only exposure to the 275 is article about the 7mm Mashburn where the 275 was used as a comparative. I have not seen any cases available for this and doubt that anyone is making cases. It was my understanding that at the time the 275 was introduced bullet failure due to the increase in velocity over the 7mm Mauser pretty much doomed the cartridge. I do not know the specs for the cartridge except for the sidenote that it's capacity is near what Remington's 7mm Mag is. I do suspect it's a 300 H&H necked down to 7mm, maybe trimmed to standard action length? If not trimmed, I guess it would be the 7mm STW by a different name. I am going to try to find out as much as possible about this and start a project rifle if my suspicions of it being a suitable cartridge are confirmed. Yes, I do believe it would be a perfect mate to the 300 H&H, especially if you have a 375 H&H to go along with it!!!

This is a long, tapered ase a'la .300 H&H, so is not "modern" in design by any standard. It would be "different", but not better, than the 7mm Rem., and a lot harder to get brass for. I would not consider it a practical choice, but maybe interesting.

And as soon as you get that one done, you'll need a 244 H & H belted to round out the set. - Dan

I have to agree that this cartridge isn't one of those practical choices, but probably as practical as most any wildcat. While not any better than Remington's 7mm, it is more unique and does have a bit of nostalgia to go along with it, and for all practical purposes would do anything the Remington flavor would. Cases can made for it, if you are willing to go through the trouble of doing that and that is a given (just as any wildcat would require). I was thinking of building a light medium bore on a Hagn action and would like a cartridge that evokes the aura of the turn of century (last century) British Stalking Rifle. I already have the 7x57, 300 H&H and such and am just looking for something of by-gone days that still performs. Such was the reason behind the 300 H&H instead of Winchester or Weatherby's Magnum.

Dan Belisle, you read my mind (what little there is). I was looking through the Cartridges of the World and saw the 244 to round out the set. I think it said the 244 was based on the 375 H&H necked down. I was thinking a 275 and 244 just based on a necked down 300 H&H. Even though it may not be exactly the original at least that way the components would be pretty simple to assemble and work with. By the way, I'm not an expert reloader, I'm just starting reloading with an original .300 Sherwood in a Martini action.

A friend has a .275 H&H in an old M-70. He has taken quite a bit of game with it and takes it down South for Beanfield hunting.

Today it's quite apparant that belted cases have been found out and are not ideal. But if you must have one OK.

Ross Seyfried wrote an article a while back on the 244 H & H and it's modern equivalent, the 6mm Mach 4. Basically, like the 275, the 244 will equal the ballistics of a 6mm-7mm Rem Mag (the 275 will, of course equal the 7mm Rem Mag). Interesting and nostalgic cartridges, I think you should go for it. - Dan

In my old lyman #37 manual it shows some loads for the 275 H & H. It shows the 160 grn at 2830 fps and the 175 to 2720. Im not so sure about the data though. It also shows the .270 win with 5 more grains of IMR 4350 than any modern manual shows.