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Technical information

Thank you to Bryan Litz, Applied Ballistics, LLC for providing the following information:

Ballistic Coefficients

The Ballistic Coefficient (BC) of a bullet is a measure of how well the bullet retains velocity. Bullets with higher BCs retain velocity better than low BC bullets, and will generally have more favorable flight performance, especially at long range. It's important to use accurate BCs for bullets when comparing to other bullets, and when calculating trajectories using ballistics programs. Visit JBM Ballistics for a good free online ballistics calculator.

BC is of minor importance at close range (within 300 yards), and becomes increasingly important as the range extends beyond that. High BC doesn't necessarily mean better precision (smaller groups). However, a high BC bullet has better resistance to wind deflection, so it can increase your chances of hitting a target at long range.

Since BCs are difficult to verify, it's tempting for bullet makers to advertise inflated BCs in order to draw customers to their product. We're doing our best to provide the most accurate BCs possible and will update the BCs as better methods/information becomes available.

In conclusion, the farther you shoot beyond 300 yards, the more important the consideration of BC should be for you.

Boat Tails

The boat tail of a bullet is there to reduce base drag, which it does effectively at all speeds. Reducing the base drag has the effect of increasing BC. Having a boat tail on a bullet is not necessary for short range shooting, but it becomes increasingly more important as the range is extended due to its positive effect on BC.

Rebated boat tails such as those used on some Matrix Ballistics bullets are different than conventional boat tails. There is a small step (typically 0.015"), or rebate at the bearing surface / boat tail juncture. This rebate is there because of manufacturing realities. Testing has shown that rebated boat tails act to reduce base drag just as effectively as conventional (non-rebated) boat tails.

Pressure Rings

Bullets are "born" with pressure rings, inherent due to the manufacturing process. Some manufacturers use them as another marketing tool, proclaiming them to be an accuracy aid. While they do not harm accuracy, there is no evidence that they are helpful. A large pressure ring will hamper seating. 

Multi-part Bullets

Balance is very important to the precision of a bullet given the incredibly high RPM's. Bullets with simple construction are easier to produce with greater balance compared to those having several parts like partitions, plastic tips, etc. As a result, the simpler construction bullets tend to be better balanced and more precise. The simple construction of the Matrix Hunting bullets promote high precision which is an important asset for target shooters at all ranges, and hunters especially at long range where precision shot placement is most critical.

Fused vs Bonded Jackets

The process of fusing jackets involves the use of flux and heat which is a slow and expensive process compared to bonding. Bonded bullets are chemically glued which is a more cost effective process with the same effect. The effect of fusing or bonding a jacket to a core is to ensure the bullet stays intact on impact, and achieves controlled expansion. Controlled expansion is a favorable attribute of terminal ballistics which is midway in the performance spectrum between highly frangible and fully solid (non-deforming).

Precision: Commercial vs Custom Bullets

Flyers can be caused by too much coffee, a bad shot, or neck tension.

Or they can be the result of inconsistencies in the bullet's ogive, even though the bullets weigh the same, measure the same length, and come from the same lot. Unless you use a bullet comparator, which measures from the base to the ogive, you won't see the difference, and neither will your seating die. Variances originate from the use of multiple dies, or from differences in the pressure dwell time during bullet formation. These differences will give your bullets varying jumps to the rifling lands.

Custom bullet makers use the same set of dies and your bullets are made in the same run, with the same pressures and consequently more consistent bullets.

Stability

Stability is an important consideration to make when choosing a bullet for your barrel. The ability of a rifle to stabilize a bullet depends mostly on the twist rate of the barrel, and the length and weight of the bullet. Other minor factors include muzzle velocity and atmospheric conditions.

It's important to carefully consider stability when choosing a bullet. Your rifle barrel needs to have at least the twist rate that we recommend for a particular bullet. If your barrel twist rate is faster than recommended, that's OK*, but if the twist rate is slower, it will result in the bullet tumbling, which is a completely useless condition.

*Having a twist that's faster than necessary will result in a bullet with more stability than it needs which is usually not detrimental. However, it's generally a bad practice to use much more twist than necessary because the excessive twist can magnify the dispersion from imperfections in the bullets balance and/or alignment in the bore.

In conclusion, the ideal twist rate for a particular bullet is the twist rate that is recommended for that bullet, or a little faster. Never slower than recommended, and not too much faster.