.270 REN (using Sierra bullets)
Date: Mar 06 2019
The .270 REN was developed specifically to NRA Hunters Pistol Silhouette competition by Charlie Rensing and Jim Rock, which requires the use of a straight wall case. The .270 REN is a wildcat designed primarily for single-shot pistols in which offers low recoil and is comparatively easy to shoot accurately. It is based on the rimmed .22 Hornet case necked straight out to accept .277-inch bullets. From a 10-inch test barrel, Sierra 90-grain HP and 110-grain Sierra SPT bullets reached nearly 1,800 fps and 1,700 fps, respectively.
Forming cases is a bit time consuming and consists of opening up the case mouth to accept .277 inch bullets, fire forming, then full-length sizing. The Hornet case is thin, so special care should be exercised to prevent damage during this forming process. RCBS dies were used to load ammunition, which can be special ordered.
Due to its small powder charges, any small variance will result in increased extreme velocity spreads. Likewise, when changing from one powder lot number to another, pressures and velocities will change.
While the accompanying data was fired using a Federal 200 primer, a small pistol (standard) primer such as the Federal 100 will offer lower extreme velocity spreads and better accuracy with select loads.