Yes, that was a good movie but a sad one also. The Golden Circle:
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My rifles feed the LR ammo just fine. I like it in the .30-30 (I have replicated the load) but I do not like it at all in the .45-70 and not just due to recoil. Yes, well, Remington went bankrupt you know but the 405 grain JSP "Safe For All Rifles" 1,300 FPS I described as not bad but a little sharp in recoil. The Remington 405 grain JSP Level II I have not seen or used but it is at 1,600 FPS. I have not seen any Winchester for .45-70 in a while nor ever used them to say how they are. I mostly reload for plinking and for bear protection duty it is the HMS Bear Load 430 grain or BB +P 430 grain, and there is some recoil there.
If they don't feed, a new-different magazine follower is supposed to cure that. Had a friend who's Marlin (M95) started jamming on him out of the blue. It was a rifle I had sold him, so I felt kind or responsible, and friend had no mechanical ability. Went out with him to shoot it, and sure enough, jam-city with Leverevolution. Did not occur to me that it was the ammo. I completely took that rifle apart, every part, bolt, everything, three times trying to find the cause of the jam. I'd take it apart, check everything, reassemble, try to run three-four rounds through it, jam jam jam. Then do it again. And again.
Happened to glance up at one of my ammo shelves, and spied a box of my reloads that had always worked perfectly in that rifle. For the heck of it, loaded the gun up with them, expecting it to jam, but the darn rifle functioned flawlessly. ?????? What. Then the light bulb start to come on. Dimly. Then I flip the Lever-evo-lution box over, and in super small fine print, it says how it may not function in all rifles, and if not, "contact the manufacturer and obtain a different follower" or something like that. Big DUH. Darn. I felt pretty dumb that day, but also quite perturbed at Hornady. Perhaps and possibly the 336 is not as OAL sensitive.
Just an opinion, but I think a 400+ grain .458" bullet at 1300fps will take care of a bear just fine. But in a strong rile like the Marlin, certainly no reason not to use a heavier load if you might run into Grizz. But I wouldn't bother.