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Quoting from the Speer reloading manual, 12th edition, from the 44 Magnum (Rifle) section (emphasis original):
"The 300 grain bullet has two cannelures for crimping. THE REAR CANNELURE IS INTENDED FOR REVOLVERS ONLY. The loads listed for the carbine were develped with the bullet crimped in the FRONT cannelure. This sets the proper overall length for reliable function in repeating rifles.
Rifle ammo for the 44 Magnum operates at the same pressure as revolver ammo-36,000 psi. These loads are within that limit."
With their 300 grain bullet:
Rifle: OAL 1.585", max load 20.5 grains H110
Revolver: OAL 1.665", max load 22.5 grains H110
Same bullet, same pressure; more powder in the load with the bullet seated out farther.
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