I've used 350gr RM Hornady's at 2,290fps on Moose - splendid performance. One, a frontal, centred the brain, smashed 3 vertebrae and exited out the back of his neck- large exit hole, ie: 2".

The 350gr. Speer has an incredibly thick jacket, ie: .063" or 1/16".
Since it is guidling metal, it's even tougher than the .049's Barnes used to use.
The bullet was designed for the .458 Mag for deer and other lighter game.
In a .45/70, Speer and some writers such as Barnsness suggests moving it over 1,900fps just to get it to expand.
The picture of one sectioned, shows that I crimped it lengthwise in the vice, just to 'expand' the jacket to show it's thickness a bit better.
I'd personally drive it as fast as possible for pigs, just to get it to expand. I do think the 350 Hornady's might be better for lighter animals.
We've also had 300gr. Hornady's (or was it a FN Sierra?) driven at only 2,260fps (Sharps .45 3 1/4"), 1" diameter exit on broadside a moose lung shot, no bones - 3 year old bull, maybe 800pounds maximum.