I apply a conventional roll crimp to all of my .32 H&R handloads to help ballistic uniformity
. Some cast bullet designs seated to the crimp groove may exceed the industry overall length recommendation of 1.350 inches; my Ruger will accommodate loaded lengths up to 1.455 inches, and the rare S&W Model K-32 in .32 H&R has an even longer cylinder.
Specifically, in traditional leveraction rifles, in most rifle chamberings, use of the right pistol primer routinely results in a significant improvement in ballistic uniformity
and accuracy and it dramatically reduces the risk of a misfire.
Magnum primers are sometimes appropriate for hunts in very cold temperatures or with spherical powders if a load's ballistic uniformity
(SD) is a little high.
Samples of each day's production are also shot to verify pressure, velocity and ballistic uniformity
Think "pillow stuffing." Years ago, published reloading information suggested puffball fillers for reduced loads where better ballistic uniformity
I started scientifically testing load variables 40 years ago, and started checking ballistic uniformity
of carefully assembled handloads 30 years ago.
This provides good load density--an important factor in ballistic uniformity
Accuracy averaged from 1.00 to 1.20 inches, with excellent ballistic uniformity
In the interests of gear and ballistic uniformity
, our class--comprised of assorted gunwriting and magazine types--was issued 22-inch barreled Ruger American bolt actions in .308, topped with Redfield 3-9x40 Revolution scopes.
I load for accuracy and ballistic uniformity
first, velocity second.
The loads shown in the accompanying chart were consistently accurate and demonstrated good ballistic uniformity
. These loads appeared maximum in my rifle, so the prudent reloader will reduce these charges by about 5 percent to start and then increase them carefully, watching for signs of high pressure.
was also great, with an SD of only 4.