Technical Newsletter From Your Ballistic TechniciansVolume 4, Issue 2
|Mid-Year New Product Announcement
.30 Caliber, 85 grain Round Nose SportsMaster Handgun Bullet
In response to shooter demand, Sierra has designed the new .308 diameter, 85 grain round nose SportsMaster bullet suited for use in the .30 Mauser, 7.62 x 25 Tokarev, .30 Luger, and similar cartridges.
While thousands of 7.62 x 25 Tokarev's have been imported in the US in the last few years, only imported berdan primed ammo was available. With the availability of quality brass from Starline, this bullet is certain to be popular. This bullet is recommended for use in Handguns ONLY. The stock number for this new bullet is #8005 and is available now.
|Headspacing for Proper Chambering
by Dave Brown
A caller will sometimes ask how far to set back the shoulder of a case after fire-forming. They want to set the shoulder of new brass to a best fit for particular chamber. Some loaders think that .002' less than SAAMI zero is correct. Others realize that the chamber could be longer, but assume one firing will always bring the shoulder to the end of the chamber.
Answering this I have to say chambers do vary in length to the shoulder and in diameter. Neither one firing nor seven may make it necessary for the shoulder to be set back at all. Temper of the brass, pressure of the load, dimensions and concentricity of the chamber all go together to determine what if any sizing is needed. Cases that will not fully chamber with ease need to be sized so they can.