Most modern AR-15 barrels will come in three twist rates: 1:9, 1:8, and 1:7. The 1:9 barrel is best for stabilizing lighter and mid-weight bullets between 45 and 77 grains. The 1:8 twist barrel is the most versatile of the bunch, the perfect option for16-inch carbine AR-15 (the most common configuration on the market.)
Product Description
| Caliber | Barrel Length | Overall Length |
|---|
| .270 Win. | 22-7/16" | 42-1/2" |
| .30-06 Sprg. | 22-7/16" | 42-1/2" |
| .308 Win | 22-7/16" | 42-1/2" |
| 7mm Rem. Mag. | 24-3/8" | 44-1/2" |
With 140 grain bullets, driven at velocities of between 3200 and 3300fps, the 7mm RM delivers extreme trauma on light bodied game out to ranges exceeding 400 yards. This bullet weight tends to lose its ability to produce wide wounding at ranges of around 650 yards.
The 7mm Remington Magnum was (and, to a lesser degree, still is) touted as one of the best “western” cartridges. It is indeed versatile. With fast and flat-shooting 140 and 150-grain bullets it's a fantastic open-country cartridge for mule deer, sheep, and goat.
308″) bullet, while the 7mm Rem Mag takes a smaller caliber (. 284″) bullet. 300 Win Mag has a higher case capacity and can take higher pressures, it also must send heavier grain bullets down range while maintaining necessary terminal ballistics. The 7mm Rem Mag, on the other hand, is using lighter bullets.
there is virtually no difference in the field or on paper between the 7mm rem mag and the 30-06. for equal bullet weights the the 7mm has a higher sectional density, which gives it a theoretical edge for penetration, but the 06 has bullets of greater weight available and the corresponding higher sectional density.
Create Your Free Custom Ballistic Report
| Range | Drop (inches) | Velocity |
|---|
| A | A |
|---|
| 200 | -2.6442 | 2697 |
| 250 | -5.7195 | 2600 |
| 300 | -10.0813 | 2505 |
The 7mm doesn't kick as much but it shoots lighter bullets than the . 300, though some of them have very high BC's which allows it to do well at longer ranges. With the right ammo, the 0-1000 meter ballistics are VERY impressive and the 7mm is easily capable of 1000+ meter shooting, but it falls short of the .
Standard or Long-Action: This category is based on the 30-06 Springfield cartridge with a COL of 3.340 inches. Many belted magnums based on the 375 H&H case fit standard actions because they were reduced in length when designed. Popular ones include 300 Win. Mag., 7mm Rem.
308 Winchester load, which is one of the most popular whitetail cartridges in America. It leaves the muzzle at about 2,820 feet per second, according to the manufacturer's ballistic chart, and you have zeroed your gun at 100 yards, which is the most commonly used sight-in distance among all deer hunters.
Stainless barrels should last longer than chrome moly. But the 7mm Remington Magnum is a high pressure, high heat, high intensity (did I mention high recoil?) round that has a well earned reputation for being hard on barrels (and shoulders). From what I read, 1500 to 2000 rounds is about the average lifespan.
The 7mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962, along with the new Remington Model 700 bolt-action rifle.
| 7mm Remington Magnum |
|---|
| Base diameter | .512 in (13.0 mm) |
| Rim diameter | .532 in (13.5 mm) |
| Case length | 2.5 in (64 mm) |
| Overall length | 3.29 in (84 mm) |
Hornady offers bullets from 100 to 175 grains, for instance, which is typical. Bullets from 139-162 grains are the most popular with reloaders. Like most 7mm Magnum cartridges, a bullet weighing around 150 grains is about optimum for all-around use in the 7mm Rem. Mag.
Yes, hodgdon says the data is interchangeable. Data IS different than IMR 4831. Also note there is sometimes a small difference in powder from lot to lot, so I would also not be surprised if there is a small velocity difference from one lot of H4831sc to another lot of H4831, but they do use the same data.
