9.3 X 74R cast load

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  • Last Post 26 January 2014
sharps4590 posted this 11 October 2012

Either late this week or early next week I have a drilling in 16 X 16 over 9.3 X 74R arriving. My question is regarding the cartridge and recommended bullet. Nearly all the 9.3 X 74R loads and load data I have found are with bullets weighing from 240 to around 300 grs. This drilling was nitro proofed for a 13 gram, (200 gr.) bullet. Before anyone asks if I'm certain it is a 9.3 X 74R and not a 9.3 X 72R, yes, I am certain as it is proofed and so stamped on the bottom of the rifle barrel for the 74mm length cartridge. Has anyone had any experience with a 200 gr. bullet in the 9.3 X 74R and worked up a load for same? As long as this drilling is in my possession it will be used with cast bullets.

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Ed Harris posted this 11 October 2012

I have not shot 200-grain bullets in the 9.3x74R, but have in the .375 H&H. With cast bullets that light the fast-burning shotshell and pistol powders work best. In the .375 about 12-14 grains of anything in the range of Bullseye, Red Dot, 700-X, SR-7625, Unique or PB works well with 200-270-grain plainbase, approximating. 38-55 ballistics. I use 8 grains of Bullseye in the. 35/.30-30 and would not recommend reducing below that. I think about 10 grains of the fast burners is about right and about +2 grains more for those in the PB, Unique, or similar range.

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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onondaga posted this 11 October 2012

http://www.castbulletassoc.org/view_user.php?id=6317>sharps4590:

I have never seen a 9.3 X 74R. please post pix of the cartridges if you can.

Gary

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6pt-sika posted this 12 October 2012

I shoot a 207 grain gascheck bullet in my 10.75x65R Collath which also happens to be in a drilling and if my memory serves I use 18.5 grains of SR4756 for about 1800 FPS .

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sharps4590 posted this 12 October 2012

Gary, I am about the worst person you could ask for pictures. I have the tech skills of a man my age who isn't tech oriented...not many.

I did find this and here's the link.

http://www.midsouthshooterssupply.com/item.asp?sku=0001320293215

Dimensions are: Rim - .524 Head - .465 Neck - .387 length - 2.93 bullet - .366

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sharps4590 posted this 12 October 2012

Thank you Ed, I'm grateful. Though not the same cartridge the informaiton is helpful. If I remember correctly you do not use a case filler?

6pt., in your drilling did that load shoot to the sights? That's about the velocity range I would like to be in, 1800-2000 fps. Was that load with or without a filler?

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onondaga posted this 12 October 2012

http://www.castbulletassoc.org/view_user.php?id=6317>sharps4590:

Thanks, that is a beautiful cartridge. If you decide to use a filler, I use this in .458 WM and .500 S&W mag. it weighs 75%less than cornmeal, it is fluffy and easily compressible and it nicely makes a quasi gas check on plain base bullets upon firing to extend the velocity range of plain base bullets:

http://www.midwayusa.com/product/695248/bpi-shot-buffer-original-500cc-approximately-1-2-lb>http://www.midwayusa.com/product/695248/bpi-shot-buffer-original-500cc-approximately-1-2-lb

The safest way to use fillers is to add the filler weight used to the bullet weight for a total projectile weight when calculating velocity/pressure for safety. You are shooting the stuff, so this calculation is necessary.

That cartridge does seem similar in volume to a .458WM. I load my .458 with 57.7 grains H4895, 12.2 grains BPI to rim and compress the filler seating the bullet. Velocity is 1700 verified with the 350 gr, Ranchdog and a tad faster with the Lee 340 gr RN-F plain base bullet. This is my Bear load in Western NY. The plain base bullets with a higher charge will go faster with the filler and stay accurate but recoil gets obnoxious after 1700 fps. At 200 yards I still have over 1000 foot pounds and that is plenty. My Bear shots have never been over 100 yards.

Gary

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6pt-sika posted this 12 October 2012

sharps4590 wrote: 6pt., in your drilling did that load shoot to the sights? That's about the velocity range I would like to be in, 1800-2000 fps. Was that load with or without a filler?

Thats without filler !

At 50 yards with that load it's about 4” high and 2” left . The sights on this drilling are very crude to say the least . I've not tried it at 100 yards but I would “assume” that it's still going to be high at 100 yards .

My other two drillings and combo gun that are all chambered for 7x57R shoot pretty much POA at 50 yards with the Hornady 154 SP and a medium charge of IMR4064 .

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sharps4590 posted this 13 October 2012

Thanks 6 pt., I appreciate your information and help.

I have a Meffert drilling in 16 over 7 X 57R, great, classic cartridge, and I settled on 47 gr. IMR 4831 under a Sierra 160 gr. SP. It lands right under the front sight at 100 yds.

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6pt-sika posted this 14 October 2012

sharps4590 wrote: Thanks 6 pt., I appreciate your information and help.

I have a Meffert drilling in 16 over 7 X 57R, great, classic cartridge, and I settled on 47 gr. IMR 4831 under a Sierra 160 gr. SP. It lands right under the front sight at 100 yds.

The main reason I went with IMR4064 in the 7x57R loads is that some one gave me an 8 pounder of the stuff and I don't use it that often .

 

The loads I clocked in my Kerner 7x57R drilling were in the 2100-2200 range . I backed my charges back 10% off the max loadsa in the book . I think I could most likely go a bit hotter but there's really no need for what I'll do with it .

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sharps4590 posted this 20 October 2012

Well gentlemen, I have to make a correction and offer my apologies for bothering all of you with what turned out to be a pointless question. The drilling arrived and after a clean up I made a chamber cast. The head and rim dimension were quite a bit smaller than the 9.3 X 74R. Also, the barrel stamping of “74 1/2” and the 13 gram bullet kept hanging up in my head as something not right about this 9.3 X 74. I posted on the GGCA site and as it turns out I have a much more interesting cartridge than the 9.3 X 74R. The drilling is chambered for the 9.3 X 75 Nimrod! If Mike and Axel peruse this site thanks to both of you again for essentially solving this mystery without much help from me. Brass, bullet mold, dies and shell holder are on the way to my house. As soon as all the goodies arrive the fun begins!!!!

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Scearcy posted this 26 January 2014

This is an old thread but let me pose a question anyhow. Has anyone tried black powder (or a substitute) in the 9.3X74R? I have a Ruger #1 in this chambering.

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