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ammo. Bryce M. Towsley
Born in 1873, .45-70 Govt. Among our first successful self-contained metallic rifle cartridges. The .45-70 was developed for the army to be used in the trapdoor Springfield rifle. It served until the .30-40 Krag replaced it in 1892. The cartridge has a cavernous case capacity designed to work with black powder of the era, and it used large-diameter bullets to compensate for the low velocity produced by that propellant. That’s the exact opposite of what’s in vogue with modern rifle cartridges today.
.45-70 Ballistics
For a while, nobody was making rifles in .45-70 and the cartridge seemed doomed. There are lots of old Springfield rifles around, but it’s a weak design, and it can’t stand a lot of pressure. SAAMI limits the MAP to 28,000 psi. Most gun makers and gun buyers were not interested in new rifles chambered for this underperforming cartridge.
The bullet energy of a .45-70 Govt. Compared to a .450 Bushmaster and a .444 Marlin. Bryce M. Towsley
Then the Marlin 1895 lever-action rifle came along in 1972 and changed everything. The .45-70 was a very popular hunting cartridge, even before this straight-walled phenomenon started, but it’s held back by all of those old guns out there. Factory ammo must be safe to use in them, so the .45-70 rarely reaches its full potential. However, in a strong rifle like a Ruger No. 1, the .45-70 can be loaded to impressive performance.
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