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Borrego Bob

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Reply with quote  #1 
I was reading an article in the April issue of Handloader magazine about the 7mm Mauser and it mentioned that early elephant hunters had more success with the 6.5 Mauser than the 7mm Mauser. The higher lethality of the 6.5mm he attributed to the longer bullets with higher barrel twist rates. The article said the higher twist rates of the 6.5 Mauser (1 and 8.66) were for longer range accuracy but at closer range say 100 yards the bullet would not yet "settle down" and when it impacted game would go into a tumble creating larger wound cavities. The 7mm Mauser relied on normal shot placement. I found that interesting because the 6.5 cult seems to imply some sort of "spreadsheet defining" mythical quality or higher sectional density to explain the effectiveness of the little 6.5. The fast twist tumble theory actually makes some sense to me. No magic just a tumbling long bullet. I've experienced tighter groups at 200 yards than at 100yards with 123gr SST with my 1 and 8 twist barrel which seems to indicate that it does need a bit of yardage to "settle down". One of the guys at the reloading shop also said he had experienced the same thing. Might be something to it. Its important to note that these were 140gr and above FMJ bullets NOT the 120gr bullets commonly used in the Grendel that give the tumble effect. Maybe longer solids will tumble on impact but probably not the normal 123gr SST's. 


6.5 Mauser FMJ bullets were used on Elephants with great success. 
[5x55mm_Swedish_surplus_ammunition%2C_produced_in_1976] 

[1538720_10152367926309520_6564959360829115734_n] 

This video has a good explanation on how a bullet can take a couple hundred meters before it becomes dynamically stable. Look at 3:40 in the video.



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michaelhoneycutt181

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Reply with quote  #2 
Okay now....that video series just got my NERDLY, inner, wild child's thighs, all sweaty. I was blown away by realizing that, all these years of private, individual study, plus some hard-science classes in college, just paid off in understanding what the narrator was saying. Now, if I could just put even half of it into practice. Live long, prosper, shoot well!
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sgtsandman

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Reply with quote  #3 
Think of it this way, Armalite/Colt did something similar with the 5.56 round.  The twist rate at the time was barely enough to stabilize the bullet and would tumble when hitting the target.  Making a much larger wound channel and thus being more lethal.  The down side was that it was only a combat range weapon with that configuration, so the military changed the specifications (and the tumbling bullet was considered "inhuman").
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Marko/IL

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The 6.5 they refer has a longer case than the Grendel. 6.5x55, 6.5x57. Meaning more velocity hence penetration. WDM Bell is most often quoted when we talk of the 6.5 and 7x57 Mauser. Bell was probably the first Elephant hunter to dissect an elephant skull. He is the one who find the "Magic" spot on a elephant head (between the eyes and slightly above at the base of the trunk) this is a sinus area with little bone to penetrate to get to the Brain.
He did not broadside shoot them. He did a few body shots to see what effect the calibers would do. His trackers followed them a couple of DAYS to find the downed Elephant. Bell to his credit decided the most humane and fastest kill (remember he was an Ivory hunter, days of tracking is counterproductive) was the frontal shot. Hunters who used small calibers and did not use THE SPOT usually were stomped to mush. Bell had "Great Success" other contemporary hunters thought he was nuts.
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Borrego Bob

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Reply with quote  #5 
I guess i'm not the only nerd around here lol.
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michaelhoneycutt181

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Reply with quote  #6 
Marko, I wondered how a man could confidently and repeatedly take such a huge animal down with such a basic weapon. No detractions from the rounds are intended, I just figured the guy knew SOMETHING special or was some kind of special nut job.

MSRHunt, nope, we nerds must stick together. It's the Only way to rule the world. On any given day, my biggest problem, other than not shooting, is rampant and raging NERDLINESS. However, with MS and its attendant brain damage, those videos will keep me happy for hours. I love that repeat notion. I want to know as much as I can about what a Grendel is doing before I even get my upper and fire the thing. That way I'll have a fairly good idea of just what it can or will do. Long range target shooting is nifty, no doubt, but I mostly want to make meat for the freezer. Something Carnivorous in me makes me want to kill and eat critters.

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Beerswimmer

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Reply with quote  #7 
The settling wobble is just a hypothesis, not theory. In fact, Brian Litz has offered to fly you to his home if you can prove it!

Bell used the excellent penetration of the 6.5 with the low recoil to produce accurate, deep penetrating shots on small targets. 

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