Daryl, GREAT post. It demonstrates the curved-in jacket portion of the Horn 300 RN at the meplat that curves IN and rivets, instead of peeling back and expanding as a "mushroom"...sometimes...

Bpsteve, thanks; question. You say the 270 did not expand at 2000 muzzle velocity?

Can you post a pic of the recovered bullet?

How much critter {inches, estimated} would it have had to go to exit? Hit the spine and did not expand?

Seems like on most broadside shots a 270/.375 that doesn't expand would exit.

Not doubting you in any way, just disecting this thing to see what the problem & solution is.

As mentioned above, most .375 bullets are designed for H&H Mag velocities, not 57mm case speeds.

The 57mm case generates significantly higher velocities than the .375 Winchester, but not nearly so high as that generated by the H&H Mag. This is the challenge for all shooters of the .375 bullets the Mauser & Mannlicher 57mm cases, obviously.

Since bullet "tricking" is easy {HP's, Flat Pointing, etc}, there are no worries about it, except that the problem must be identified before game is shot.

All this goes for .375 Velopex Brit, 9.5 Mannlicher and .375 Win shooters {Ruger No. 3's} and of course 9.3x57 shooters who use .375 bullets sized down as I have.

A peek at Daryl's perfect pictures shows the difference between the 300RN and 270RN bullet jackets. Take that 300 jacket off to a similar configuration demonstrated by the 270 as I showed in a previous post {tip grinding} and you get a great medium game bullet of 296 grains.