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Hi Bruce yes it will handle it no problem

Yes it will most rifles are ok with the buffalo bore rounds

The 357 heavy loads are listed as being ok from the Marlin Levers so should be fine in the Henry's. I would still seek advice from Henry on this so as not to risk life or limb at Henry Product Info - Tele: 201-858-4400

Company president Anthony Imperato states that the Big Boy can handle any loadings within the SAAMI pressure limit (36,000 PSI for the .44 Magnum). If you're a glutton for shooting expensive ammo, Buffalo Bore makes Big Boy-safe .44 Magnums that deliver nearly 2,000 lb-ft of muzzle energy. That said, their very heaviest .44s are not recommended; the slow-twist barrel may not properly stabilize the heaviest .44 Magnum bullets. But the Big Boy [reportedly] does fine with bullets up to and including 270 grains.

Buffalo bore states that this ammo is safe in any steel frame revolver so it will be fine in a henry big boy rifle. the henry is much stronger that some steel revolvers

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Yes this gun will handle the buffalo bore rounds of ammo. This is a modern firearm and therefore will handle any loads that are currently on the market, no matter the manufacturer. The only time you have to be careful with heavy loads is in older firearms and this is a brand new gun, so again yes it will handle and shoot them just fine. Hope this helps.