.270 Winchester (TC Encore) Handgun
Date: Feb 12 2015
Notes from the Lab: .270 Winchester (TC Encore) Handgun
The .270 Winchester was formally announced in 1925 and was first offered in the Winchester Model 54 bolt-action rifle. It was based on the .30-03 Springfield case necked down to accept .277-inch bullets. As a result, it has a maximum allowable case length of 2.540 inches, or some .046 inch longer than the .30-06. Early ballistics advertised a 130-grain bullet at 3,140 fps, but that has now been reduced to around 3,060 fps. A 150-grain bullet was later advertised at 2,900 fps (now generally reduced to 2,830 fps) and a 100-grain bullet at 3,480 fps. It boasts of a flat trajectory and moderate recoil, with many shooters reporting that they do not flinch and that they shoot it more accurately in the field than heavier recoiling cartridges. It has been offered in a wide variety of rifles including bolt, pump, semi-auto, several single-shot actions and even double rifles. It has become one of the most popular sporting cartridges among hunters and remains a top seller. Although it is primarily a rifle cartridge, it has also found its way into single-shot handguns such as the Thompson/Center Contender used to develop the accompanying data.
When using 100- and 110-grain Hornady bullets, powders with a faster burn rate than traditional .270 powders such as Hodgdon Varget, Alliant Reloder 15 and IMR-4064 produced the highest velocities and were the most accurate. Moving up to the 130-, 140- and 150-grain bullets, the more traditional powders gave the best performance, including IMR-4350, IMR-4831, Accurate 4350, Alliant Reloder 19 and Hodgdon H-4831.
Due to the reduced velocities of the 15-inch barrel of the T/C Encore pistol, to achieve enough velocity for reliable bullet expansion at normal hunting distances, it is suggested to use the 130- and 140-grain bullet weights for deer sized game, which reached more than 2,600 and 2,500 fps respectively.