Pritu79 wrote:Beautiful rifle... i guess this caliber was also known as the 7mm-06. I too have grown up reading Jack o'connors articles, my dad had subscribed to American rifleman and american hunter....i have a massive stack of these magazines probably since 72 or 73.... this really refreshed old memories.
Pritu, the 7mm-06 and the .280 Remington are very similar. The .280 Remington uses the slightly longer .30-03 cartridge case with the shoulder moved up just a tad so it will not chamber in a .270 rifle. So your dad was an NRA member? Those magazines usually come with an NRA membership.
The Three Sisters
They are generally called the three sisters. The .270 Winchester, the .30-06 Springfield and the .280 Remington use the same parent cartridge; the .30-03.
The .30-06
The .30-03 was shortened slightly by 0.07 inches (1.8 mm) in the neck, the powder was reformulated to burn cooler, and the bullet was changed to a 150 grain (9.7 g) spitzer bullet, creating the .30-06 cartridge.
http://en.wikipedia.org/wiki/.30-03
The .270 Winchester
The .270 Winchester cartridge was based on reducing the neck diameter of a .30-03 cartridge case to retain a similar bullet-holding length with the same shoulder.
http://en.wikipedia.org/wiki/.30-03
The .280 Remington
The commercial .280 Remington (or 7mm Express Remington) is very similar, but uses the slightly longer 65 mm .30-03 case with the shoulder headspace extended slightly more than one millimeter (.05 inch) to prevent chambering in .270 Winchester rifles
http://en.wikipedia.org/wiki/.30-06_Spr ... Cartridges
Bullet Diameter:
.30-06 Springfield = .308 inch
.280 Remington= .284 inch
.270 Winchester= .277 inch
If you compare the ballistics, there isn't much difference between the .270 and the .280 with the .280 generating slightly higher velocities (than the .270) for a given bullet weight. With heavier bullets, the .284 diameter bullets have a slightly better a ballistic coefficient over the .277 diameter (.270 ) bullets. Comparing it with a .30-06, they are very similar but with lighter bullets, the .280 (.284 inch or 7mm) produces a flatter trajectory and more retained energy downrange vs the .30-06 (.308 inch). This is because the .284 diameter bullets have a slightly better ballistic coefficient.
The advantage that the .30-06 has over both the .270 and the .280 is that you can load much heavier bullets (up to 220 grain bullets are commonly loaded commercially) in the cartridge if you want to tackle larger game. The .30-06 produces more energy with bullets over 180 grains than the .280. Don't get me wrong, these three cartridges have very similar performance. The .280, I feel, is not loaded to its full potential (commercially) as there are a lot of pumps and auto-loaders out there that are still chambered for it.
When reloading, the game changes for the better as one can load the .280 to velocities approaching 7mm Mag with lighter bullets. I use my .280 with 139 grain Hornady Interlock BTSP bullets for deer sized game. It is sufficiently flat shooting that If I zero it at 250 yards (or sometimes 200 yds), I can center on the body of a Whitetail deer (with a target area of about 12 inches in the vital area) up to 350 yards and it won't rise more than 2.9 inches or drop more than 8.5 inches below my point of aim. So I can dispense with having to know the range to my target exactly (at least within 400 yards). I don't think I would take (or even get) a shot much further than that anyway. I haven't used it to hunt for a few years as I have to go to Northern Minnesota to use it. The area that I live in is shotgun only. Keep in mind that wind, altitude, humidity, temperature, mirage, etc can make a hash of your shot. The choice of .284 diameter bullets available is very wide but then so is the choice of .308 bullets.
Honrady Interlock BTSP (Boat Tail Spire Point)
I only load one load for my particular rifle as the only large animal that I hunt is Whitetail Deer. I'm happy with the performance of the bullet and a hit almost anywhere in the vital area will usually drop the animal.
This is the approximate performance that I look for.
Yds. M.V. M.E. drop (or rise in inches)
0.0 3000 2778 -1.5
50 2894 2585 1
100 2791 2404 2.5
150 2690 2233 2.9
200 2591 2073 2.1
250 2495 1921 0
300 2401 1779 -3.5
350 2308 1644 -8.5
Would I buy a .280 over a .270 or a .30-06 if I had to do it over? I'm not sure but I would be happy with any one of the three sisters.
“Never give in, never give in, never; never; never; never – in nothing, great or small, large or petty – never give in except to convictions of honor and good sense” — Winston Churchill, Oct 29, 1941