26 August 2019
That's good shooting, apparently the pitting in the bore is not spoiling the party. Maybe it shoots a little to the left of dead center, but not enough that it would worry me, personally.
Usually these old fixed sight guns from nearly 100 years ago shoot pretty close to point of aim, if you load a more or less "standard" load, or when you figure out what load they "like" and were set up for from the factory.
Exactly. This 452AA load is close to factory velocity and bullet weight, which was what I had hoped to do. Payload and velocity approximates a full-charge .45 ACP IPSC load with H&G#68, so I figure no more oomph is needed. Next is to experiment with Bullseye to determine a safe charge weight for the old gun which is a good match to this load.
I'm thinking that 6 grains of modern Alliant is about right, based on modern Lyman data for Bullseye and similar fast-burners like TiteGroup, 700-X, Red Dot, Acc.#2, Trail Boss. P.268 in the Lyman Cast Bullet Handbook 4th Edition goes up to 6.5 grains of Bullseye for 962 fps at 12,700 cup in a solid 6" test barrel in Universal Receiver. I would consider that max. for the Colt and work up to it.
73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia