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  #1  
Old 03-15-2017, 05:12 PM
drz drz is offline
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load data for 7mm Gibbs?


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Does anyone have data for the 7mm-Gibbs, I have been using data for 280 ackley improved.
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  #2  
Old 03-15-2017, 09:42 PM
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drz,

My available info is taken from, "Gibbs' Cartridges and Front Ignition Loading Technique", published by Wolfe Publishing Company, Copyright 1991. ISBN number is 0-935632-99-9

This publication gives info for the 7mm Gibbs with 120grain, 139gr, 154gr and 175gr Hornady bullets.

If you will tell us which bullet weight your interested in, I will quote the data available from this book.

Bare in mind that the info may be optimistic and is all listed as "max" and clearly should be worked up from a safe starting point. The publication suggests a starting point at least 4gr. below the listed charges.

Crusty Deary Ol'Coot
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Old 03-16-2017, 06:58 AM
drz drz is offline
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7mm Gibbs

I will be using heavy 175gr 180gr for long range. thanks for the info.
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  #4  
Old 03-16-2017, 08:44 AM
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OK, Here is the 175gr data.

Bullet, "175gr Hornady RN (B.C. 274)"

61gr - H-4831 - 2965fps

57gr - RL-19 - 2913fps

58gr. - H-4350 - 2906

56gr. - H-414 - 2882fps

51gr. - IMR-4320 - 2844fps

54gr. - H-380 - 2790fps

49gr. - RL-15 - 2780fps

This data from a 26" barrel using CCI 250 primers and Remington/Peters cases.

Remember to back off from the above info by at least 4gr (recommended in publication) for starting loads.

Good luck and be safe!

Crusty Deary Ol'Coot
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Old 03-16-2017, 09:41 AM
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Lots of new powders to consider reloader 26 an VV n570 come to mind
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Old 03-17-2017, 10:10 AM
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My little 7mm x 300 RCM wildcat is in between these two. I will note that I had to really goose up the pressures to make this a slam dunk, at 500 yard customer, using semi spitzer 175 gr. bullets. Launching these 175's at around 24-5 hundred feet per second, was about like throwing rocks at that 500 m target, out at the end of our rifle range.

edit; Rocky Gibbs advertised it being equal to a Rem. Big 7, but with today's powders, his parallel blurb about having five rounds down, instead of the Rem's three, makes more sense, IMO. You're not going to tell any difference between the 280, the 280 Ack., or my 7mm x 300 RCM. It's the pressures, not the slight differences in capacity which tells the tale. I can equal the 7mm RSAUM's net capacity, when its in a short action, and I can seat my 175 gr. bullets out to the limits of my M-98's magazine. But you should only treat these as ball park equivalences. FWIW, I only get three down, like the larger capacity Rem. Big Seven. So the Gibb's and 280 Ackley Imp. still fill their niches.

Last edited by carpooler; 03-17-2017 at 10:19 AM. Reason: Gibb's ads
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Old 03-18-2017, 03:11 PM
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Well, maybe. Back in the late 1960's I hunted deer with my .25 Gibbs while my brother used his 6.5 Gibbs, using 4831 which we bought in 100 lb kegs for $35 per keg. Soon as the snow lets me get back up to my reloading shop I will look for those data. Mostly used 100 grain bullets made by Sherburn Gun Shop in Springfield, Ore. We chronogr aped our velocity as matching the .264 Wi n Mag.
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  #8  
Old 03-24-2017, 03:58 PM
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Not much help on the 7mm but used the .25 Gibbs as favorite deer rifle for years. Used 56 grain of 4831 under the 117 grain bullet.

Used 60 grain of 4831 under the 100 grain bullet.
Used 62 grain H570 " "


Coot, you must have known rocky?? When I was a professor at Wash. State I drove over to Viola to visit him only to find that his shop had burned.!?
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Old 03-24-2017, 06:23 PM
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Oldguide,

No, didn't meet Rocky, clearly a case of too soon old and too late smart.

My father in law's cousin lived next door to Rocky out on Flannigan Creek out of Viola and I was at Tad's a number of times while Rocky was alive.

It was only later that I became interested in Rocky and his cartridges.

Later,

Crusty Deary Ol'Coot
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