I was taught the belt was introduced for positive head spacing. I do not believe it had anything to do with feeding. The belt was supposed to be exactly .220" to the back of the case. In reality they have never been able to mass produce brass keeping a tolerance of .220" ... they are all considerably shorter.
7mm Build - Caliber questions
- Thread starter opper
- Start date
I was taught the belt was introduced for positive head spacing. I do not believe it had anything to do with feeding. The belt was supposed to be exactly .220" to the back of the case. In reality they have never been able to mass produce brass keeping a tolerance of .220" ... they are all considerably shorter.
You mentioned positive head spacing but you also said the belt was put on the 375 to improve feeding over rimmed cartridges...
I don't believe the intention of the belt had anything to do with improving feeding.. it was all about head spacing.
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
9 twist is all you will need. The 180's are fantastic at 1000m and beyond. There are very few bullets that can touch it ballistically.
As for game, neither is good for breaking bone. These are boiler room, CNS bullets. If you put them in the right spot, the effect is dramatic. Put them on bone and you will not be happy.
That is why they are so popular with LR hunters. When the bullets slow down, the penetration improves. My SWAG would say any hits on bone above 2500fps and it will go puff.
Jerry
I had Dennis build me a 280,plain old 280 with heavy Gaillard barrel in a sendero stock.He trued the action and did the trigger.This rifle will shoot ragged holes at 100 yards.Cheap to shoot and no recoil.
Gord.
Will have to take to Summerland this spring.
Gord.
Will have to take to Summerland this spring.
I have talked with a few guys now that have me thinking a 280 AI would be all one needs to get into the ultra heavy 7mm game and with the added advantage of tons of different brass sources.
I also like the 284, particularly the Shehane version.
I also like the 284, particularly the Shehane version.
the belt was introduced to improve feeding while maintaining positive headspacing. am i the only one who understands this? have you looked at a 375 h&h? how else are you going to headspace without a rim or a belt? a rim does a pretty fine job of controlingheadspace and has since the introduction of the self contained metalic cartridge. the belted cartridge was an extrapolation of that, that also helped in feeding out of magazine rifles that were relatively new at the time. at the risk of over explaining things check your history and think more about the available technology at the time. now add marketing and advertising into that. "if the 375 has a belt than my new wonder (pick a caliber) should have one too whether it needs one or not, add magnum to the title and you have a winner. we are all experiencing this same thinking in the new line of short magnums and ultra super short magnums
the belt was introduced to improve feeding while maintaining positive headspacing. am i the only one who understands this? have you looked at a 375 h&h? how else are you going to headspace without a rim or a belt? a rim does a pretty fine job of controlingheadspace and has since the introduction of the self contained metalic cartridge. the belted cartridge was an extrapolation of that, that also helped in feeding out of magazine rifles that were relatively new at the time. at the risk of over explaining things check your history and think more about the available technology at the time. now add marketing and advertising into that. "if the 375 has a belt than my new wonder (pick a caliber) should have one too whether it needs one or not, add magnum to the title and you have a winner. we are all experiencing this same thinking in the new line of short magnums and ultra super short magnums
You guys are both right.....let it go.
According to Holland and Holland (and some research will prove this), they came up with a belted case so the same cartridge could be used in both double rifles as well as bolt action magazine rifles. The traditional rimmed case did well in doubles but prevented reliable feeding from magazines. With the long tapered cases (H&H Super 30, later renamed to the H&H Magnum and others using the same case body dimensions and taper) there was nothing to hold headspace. So the belt was the answer. The belt had nothing to do with case strength; it was the solution to a headspace and feeding problem. This all happened in the early 1900's.
- Location
- Somewhere on the Hudson Bay Coast
I believe the difference in trajectory between the big case 7s and the 7 mag would be extremely difficult to utilize. Therefore the choice of those cartridges goes well beyond the point of diminishing returns considering the additional cost per round. If you are looking for a long range big game round, the big case .300s and 338s loaded with heavy for caliber bullets are a better choice than a 7mm IMHO.
