This sounds like some good ammo, but I question the use of this ammo in a Handi. Ammo makers keep pushing the envelope and making faster and faster ammo. I got a new Lyman reloading manual this summer. Was reading from it earlier this week. Where they list guns that can be shot with certain loads, they have downgraded the H&R guns. Case in point, 45-70, they no longer list the 45-70 H&R as being able to shoot the Lever-gun loads. They say the H&R should be limited to the Trapdoor loads. Are they just being legally conservative or is there some sound reasoning behind this? Having seen guns blow up and people sent to the hospital, I am leery of some new products, in old designs. This new ammo sounds nice, but it's hard to improve on an already good thing.
I have one of the first .35 Whelens from the 90s, with the longer barrel. My Dad used it to take an Alaska/Yukon Moose, using factory Remington ammo. 250gr Core-loc bullet, made a complete pass through at 80 yards. Lungs and Heart were all turned to jelly. Moose turned around took two steps, then fell.
Using a Custom .35 bolt gun, I shot a Grizzly with ammo from the same box my Dad used. Bullet hit under the chin, continued back and shattered about 10 inches of spine, for an instant kill.