If you need reduced-recoil handloads, do it with 140-grain bullets to improve ballistic efficiency
and fit chamber throats.
Because of the high density, relatively short lead or lead-alloy bullets offer excellent ballistic efficiency
. Such bullets give good accuracy and terminal performance in low-velocity loads.
While ballistic efficiency
is hard to dismiss as irrelevant, it's also hard to love.
Overall, bonded designs provide a significant performance advantage over conventional non-bonded lead-core bullets and are available in a wide variety of styles from exposed-lead nose to polymer tipped designs for improved long-range ballistic efficiency
. There are probably more types of bonded bullets on the market today than any other.
The short powder column and sharp 35-degree shoulder angle contribute to the WSM's ballistic efficiency
The neck of the 5.56mm NATO case was increased sufficiently to accept a 6.5mm bullet, while case length was shortened slightly to 42mm, just enough to accept projectiles of higher ballistic efficiency
than the original length would allow.
They placed their emphasis on: A) superior accuracy, B) downrange ballistic efficiency
for retained energy and a flat trajectory, C) positive controlled expansion on target, and D) a lasting finish that retains a fresh visual appearance even after long storage.
"Increasing diameter, weight and ballistic efficiency
beyond what is possible from the .22 centerfires brings us to 6mm and up, with a maximum bullet weight of around 130 grains.
To achieve a flat trajectory, and thereby improve long range capability, requires a higher degree of ballistic efficiency
than can be provided by the 6x45mm.
Yet another was great ballistic efficiency
. In the early '70's I first became aware of a new Hornady bullet, the 7mm 162-grain BTHP.
This probably made sense commercially--the 6-inch satisfied those who wanted (almost) maximum ballistic efficiency
and a superior sight radius; the 4-inch remained for those who wanted something a bit more "packable." But the 5-inch--a wonderful compromise--seemed to have an extra magnitude of coolness, particularly in S&W's Model 27 and Colt's Official Police.
This significantly increases ballistic efficiency
without reducing accuracy potential.