I'm bringing this thread back up, because I've spent a bit more time with the M76.
I got out the chrono, and ran some ammo over it.
Factory Remington, 98gr LRN. 850 fps, spread of 72 fps. It actually shot well.
Then I reloaded my few pieces of brass. I first loaded with 2.6g Promo, but thought that was too hot (pic at beginning of thread). I reloaded with the same Lee bullet, and 2.0g Promo.
As can be seen, this load is MUCH more accurate than the 2.6g load.
I was getting some wild velocity spreads (ES was 104 fps) until I started tipping the revolver muzzle up prior to each shot. That settled the numbers down a good bit
860 fps, I think it's still too hot. I'm going to try to drop the load to 1.8g. I want to stick with Promo, because (as we used to say back when I worked for Our Crazy Uncle) I have boo-coo of it. Many pounds.
I bought the Promo several years ago, $90 per 8 lb jug, $11.25 per pound. This means at 2.0g per load , I have 3/10 of 1 cent worth of powder in each shot.
Yes, a third of a cent of powder per shot. Combined with my self-cast bullets, and the pre-stupid primers, I'm shooting this thing for under a nickle a shot.
.
This revolver is fun !