I went to the range today, and did get some chrono work done, but the darned Caldwell chrono I have got pretty finicky and I was only able to check 3 different loads with the Rossi. I guess I will have to get myself a new and different brand as this is the second dud Caldwell chrono. The first arrived broken and this one was what they sent me as a replacement.
Anyways, here is what I got out of my Rossi, which has a 20" barrel like your Henry, Mike.
First load:
Powder - Accurate #9, 11.1 grains
Primer - CCI 550
Bullet - MBC 180 grain RNFP Striker
Average muzzle velocity - 1467 ft/sec
Standard deviation - 16.34 ft/sec
Min - 1450
Max - 1498
Energy - 840 - 897 ft-lbs
Impressions: No signs of pressure, so I can try upping the powder a bit more. Moderate recoil in the Rossi, but not bad.
Second load:
Powder - H110, 13.0 grains
Primer - CCI 550
Bullet - MBC 180 grain RNFP Striker
Average muzzle velocity - 1461 ft/sec
Standard deviation - 15.50 ft/sec
Min - 1440
Max - 1488
Energy - 829 - 875 ft-lbs
Impressions: Minimum load shown from the Hodgdon web data with a different bullet. No signs at all of pressure, so I can push it higher on powder charge closer to the max shown on the Hodgdon data of 14.0 grains. Recoil actually felt a hair lighter than the Accurate loads with essentially the same velocity.
Third Load:
Powder - Accurate #9, 13.5 grains
Primer - CCI 550
Bullet - MBC 140 grain TCFP Zinger
Average muzzle velocity - 1769.57 ft/sec
Standard deviation - 20.37 ft/sec
Min - 1741
Max - 1796
Energy - 942 - 1002 ft-lbs
Impressions: Nice little round out of the Rossi. Recoil felt a little lighter than both of the heavier bullet loads.
After running the third string over the chrono, it went goofy and started giving constant errors, so I didn't get to try them in my 627 Pro across the chrono. I did shoot them in my revolver and encountered no problems with them and had me a good old time at the range.

I also shot my 629 too but didn't get a chance to see how my latest new load for it did velocity-wise either because of the goofy chrono. If there hadn't been so many people at the range today, I think I would have put a couple of those 240 grain slugs through it from my 44.
