Got out yesterday to shoot, a great day, norther in, 20 mph gusting to 35.
Blew my target stand all over the place, had to wedge it in a downed tree top to keep it up.
Tried the 220gr rn gc, Herco, 12gr, 1240fps .
H110, 25gr , 1620fps.
 
Then 320rfn gc, IMR4198, 35gr, 1580fps.
Rel 7, 45gr, 1740fps.
 
Then, 405gr rfn gc, Imr 4198, 35 gr 1610fps.
 
Then, 500gr 3R gc, Imr 4198, 35gr, 1620fps, too much for me!
IMR 4064, 34gr, 1160fps.
H 4895, 39gr, 1430fps.
It seems the 4198 is just a little slow for the 320gr,as I got higher velocities with the same charge with the heavier bullets, I am going to get some A1680 or W680 and see how they do with the 320gr bullet.
I recently did the o ring on the forearm screw stud trick to freefloat the barrel and the groups are better, see attached targets.

That's interesting... H110 in a .45-70.  I reckon it isn't too much of a leap from .410 to .45-70 and they are both relatively straight sided cases.

I admire your tenacity in braving the weather to get your shootin' in.

The off hand target, the lateral spread is not from the wind blowing the bullets,it is from the wind blowing me!

Don,

What speed are you looking for out of the 220?
 
On those light charges - 12 and 25 grains - are you putting an over-powder wad on top of the charge?
 
How does using the O-ring on the forearm post change the look of the fit of the forearm to the bbl?
 
Finally, I notice you make no mention of the recoil of the 320 at 1740, or the 405 at 1610, but don't like the recoil that the 500 produces at 1620. Were the lighter weighted bullets that much 'better' in recoil?
 
Paul

Sounds like you're getting some of our wind. :)

Yes, Quig, I really wish you people up there would keep the door closed.
 
Paul, I got 1250 fps with the 220 gr rn and 12gr Herco and 1600 fps with 25 gr of H110. Yes, the Lyman 5/8x5/8x1/4" of dacron batting
This is, let the kiddies shoot a coke can level stuff, they can brag they shot a .45-70!
No, the 500gr at more than 1500fps and especially at the 1620 fps I got is the only one that rattles my teath and makes my shoulder ache.
I have pushed the 320 gr rfn to 2000 fps and it does not bother me.
The o-ring is the size that is big enough to fit over the stud, but is a thinner one, not the thick types with the same inside diameter.
On mine, it lets a bill slide under the barrel with only a trace of drag.
I have also taken to supporting the handirifle at the hinge point only, not out on the forearm, when shooting off a rest.
I do not know if it is either or both, but the group size got better, the 3 ,500 gr shots are not much over 1/2" c to c .:D