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The Mk12 SPR, however, was the most accurate rifle I had and, therefore, I often carried this amazing performer on combat missions.
the lower you can get to the ground, the more stable you’ll be. The more stable you are, the more accurately you can shoot.
requirement to mount a scope higher than is necessary on standard bolt-action rifles. This is because the hand guard on an AR-style rifle will usually interfere with a scope’s objective lens.
The differences in loading time, ability to get low to the ground, and scope mounting height between semi-auto and bolt-action rifles are lessened by the fact that many bolt-action rifles are now being made with (or converted to) pistol grips, AR-style hand guards, and the ability to accept detachable magazines.
By U.S. law, the receiver is the only individual part of a firearm that is treated as a firearm.
Faster or slower twists are required to stabilize different weight, size and speed bullets. The twist-rate of rifling is measured by how many inches a bullet will need travel in order to make a complete revolution.
Twist-rate: the speed at which a bullet rotates measured by the number of inches a bullet travels for each complete revolution.
As a general rule, heavier bullets in the same cartridge need to be spun faster in order to properly stabilize. For example, 55 gr. bullets fired from a 223 Rem. work well in 1:9 twist barrels. In order to accurately fire 75 gr. bullets from a 223 Rem., however, a faster 1:8 or 1:7 twist barrel is needed.
As a note, most pistol barrels aren’t long enough to allow for even one complete revolution of a bullet.
Free-bore: the distance the bullet has to travel before contacting rifling.
To minimize throat-erosion and to reduce deformities on the bullet, a rifle can have progressive-twist rifling. “Progressive-twist rifling” does not have a consistent twist-rate, instead it gradually increases the rate of twist as it travels down the barrel until it reaches the desired twist-rate for the particular cartridge at the end of the barrel. Progressive-twist rifling avoids the abrupt twist in the throat of a normal barrel and instead allows for a gradual increase of twist. This type of rifling is nice to have but it’s more expensive than consistent-twist rifling and not necessary for
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Another way to help minimize flex is to have a stiffer barrel. The contour of a barrel is the outside shape of the barrel. A thicker barrel, sometimes called a bull barrel, is more rigid and more consistent than a thinner barrel. The downside to thicker barrels is their weight. This is why you’ll usually see target barrels with thicker contours or profiles and hunting barrels with thinner contours.
In fact, all a longer barrel does is allow more time for the powder to burn, producing a faster bullet.
For years, my go-to rifle has been a 308 Win bolt action rifle with an 18 inch barrel. It is extremely accurate and it usually turns a head or two at the range because of how short the barrel is. Even though it has a short barrel, it can reach out to targets at 800 yards just as well as a 308 rifle with a 24” barrel. Now, my shorter barreled rifle will need more elevation dialed into the scope to hit the same target as the longer barrel, but it will be just as (or more) accurate. To me, the trade off of having to dial up 34 MOA instead of 32 MOA is negligible in exchange for having a handy and
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Ideally, a trigger’s break (the point at which it releases the tension) should be crisp and it should have a consistent pull weight.
A lighter pull-weight trigger is generally desirable when accuracy is concerned because it is easier to fire the rifle without disturbing the sights.
