96wa6
10-05-2010, 03:10 PM
Gang:
I just tried Red Dot in the .45 Colt for the first time and I need to know if you guys actually chrono-ed your loads. 6.0-gr. gave me 707 fps avg., and 6.5 gave me 756 fps avg., each of 12 shots. What could cause such a shortfall in velocity from the oft-quoted 850-ish fps?
Boolits were RCBS 255 LSWCs sized .452" out of a S&W 625 Mountain Gun (4" bbl, yeah a tiny bit short). The boolits would push through the cylinder throats with a tiny bit of effort, so they might be a TINY bit undersized. Apache Blue lube.
WW cases, WLP primers, built on Redding dies, Redding expander, and the boolits are tight in the cases (can't get 'em in by hand), and they've got a nice, heavy roll crimp on 'em.
I even weighed every charge (I do that sometimes when developing a load).
I've been reloading for over 30 years (and started on pistol loads way back), so I think I covered the bases.
What gives?
Marcus
I just tried Red Dot in the .45 Colt for the first time and I need to know if you guys actually chrono-ed your loads. 6.0-gr. gave me 707 fps avg., and 6.5 gave me 756 fps avg., each of 12 shots. What could cause such a shortfall in velocity from the oft-quoted 850-ish fps?
Boolits were RCBS 255 LSWCs sized .452" out of a S&W 625 Mountain Gun (4" bbl, yeah a tiny bit short). The boolits would push through the cylinder throats with a tiny bit of effort, so they might be a TINY bit undersized. Apache Blue lube.
WW cases, WLP primers, built on Redding dies, Redding expander, and the boolits are tight in the cases (can't get 'em in by hand), and they've got a nice, heavy roll crimp on 'em.
I even weighed every charge (I do that sometimes when developing a load).
I've been reloading for over 30 years (and started on pistol loads way back), so I think I covered the bases.
What gives?
Marcus