06 February 2019
I did some chronograph work yesterday - some results follow straight off the tape.
38-40 401043/WW0.401 7.7 GRS Unique Rem-UMC balloon head cases, CCI 300 loaded in 2009 944 fpsm, Ruger NMBH
401043/WW/0.401 6.0 grs HP 38 reformed 44-40 range brass CCI 300 in Ruger NMBH 852 fps mean; Same loads in Colt New Service 776 fpsm Ruger must be tighter.
For Ed's info United States Cartridge Company Caliber 38 for Winchester 1873 (light blue box marked LESMOK Central Fire Solid Head), cases are Balloon head with a small primer inscribed with US on face. Box has 2 SC business license tax 5 cent stamps on top. Fired 6 rds in Ruger NMBH since I figured it would be easier to clean - 849 fpsm with 812 to 884 spread, lots of smoke and all went bang. Took a while to clean before I did anything else.
Western 38-40 180 gr SP, yellow box, no zip code, 2 8 cent SC tax stamps, probably from the 60's 1068 fpsm from Ruger.
Old Rem-UMC JSP Balloon head only got one reading for 3 rds (one didn't fire), probably operator error 960 fps.
Have readings for misc. 32-20, 45 Colt and 38 SP/357 loads available. if anyone is interested.
I did learn that a Ruger OMBH that has many problems, some fixed, is only going to be accurate using 357 brass, while I have been trying to make it shoot with 38 spl brass - apparently the excess cyl gap and 0.360 throats don't like short brass.
Thanks for reading.