Sidebar to accompany .38 Special Test results
© 2014 – Ed Harris
The accompanying test data were fired from sandbags at 25 yards using my .357 BSA Martini. I started this project simply because I wanted to know if my own cast bullets shot as well as “bought ones” and whether it was worth the money to buy commercial soft-swaged wad cutters or good quality commercial cast bullets, or to cast my own.
I was very pleased that my own wheel weight metal, cast Saeco #348 wad cutters, loaded as-cast, unsized, lubed either with Lee Liquid Alox (LLQ) or Rooster Jacket tumble-on lube (RJTL), in unsized fired cases, decapped and flared only, with my standard charge of 3.5 grains of Bullseye, crimped in the revolver crimp groove and profiled in the Lee Factory Crimp Die shot equal to factory loaded Winchester wad cutter ammunition. The results also indicate that using the same simplified loading, method with soft-swaged Remington factory wad cutter bullets, enables you to assemble your own accurate match ammunition to equal or exceeding the grouping of factory wad cutters now available.
Commercial hard cast bullets of 92-6-2 alloy, sized, to .357” or 358” diameters did not shoot as well as my own unsized wheel weight cast bullets lubed with LLQ or RJTL. The Remington soft swaged HBWC bullets shot wonderfully when flush seated, using the black dry lube which came on them. None of the cast double-enders grouped as well when flush seated as they did when seated out and crimped in the crimping groove.
I believe that this is attributable to two causes. First, flush seating results in increased free bullet travel of the wad cutter bullet during initial acceleration, when fired in the .357 chamber. Also, when the top driving band is seated below the case mouth, crimping and profiling in the Lee Factory Crimp Die results in a slight reduction in its diameter. When bullets are seated out and crimped in the crimp groove with the top band exposed, its diameter remains as cast, or as-sized.
I believe that either an enlarged front band, or an expanding hollow base, as in the Remington HBWC bullet, aid in providing a positive gas seal, which reduces leading and bullet deformation, which hurt accuracy. There was no leading whatever with the factory HCWB bullets or the unsized cast bullets lubricated with either LLQ or RJTL.
I did some limited firings of my .38 Special Colt Officer’s model from sandbags to check each load. The loads which shot well in the Martini also shot well in the Colt. All of the cast wad cutters were tested with the same 3.5 grain charge of Alliant Bullseye, because this is proven reliable in past experience. The results would indicate this is the case.
The soft-swaged Remington hollow-based wad cutters shot consistently well, even with somewhat lighter and heavier charges than those usually recommended. I found that a somewhat heavier charge of Alliant Bullseye, than the often recommended 2.7-2.8 grains was needed with the HBWC bullets to approximate the velocity of factory wad cutter loads and that whether firing in the Martini Cadet rifle or the 6” Colt revolver that a charge in the range of 3.0 to 3.2 grains was correct.
When Spring weather permits, I hope to do some confirmation firings outdoors at 50 yards and also shoot some lead round nose and SWC bullets from the rifle at 100 yards to see how well a .38 Special rifle fares as a mild and quiet small game rifle. So stay tuned!