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Old 10-22-2010, 12:54 AM
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Default Hot 7mm Rem. Mag. load question

I have an 1885 Browning in 7 mag. And have been trying several loads, went by a buddyís place today and tried three loads and then he offered a fourth one to try. 145 grain Speer Grand Slam loaded with 65 grains of IMR 4350. Donít look for it in the book, they donít go this high! LOL Just wondering if anyone else has had any experience with a similar load. I didnít see any pressure signs and got a three shot 100 yard group that was just over Ĺ an inch.

J.B.
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Old 10-22-2010, 11:40 AM
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No, I haven't had a similar experience and hopefully never will! That load is almost 10% over the maximum load listed for the same bullet in the Speer manual. If I remember correctly from working with the Powley Computer years ago that would translate into roughly a 20% increase in pressure with IMR series powders. Regardless of the absence of pressure signs and good accuracy that load is clearly not safe. I won't even get into what I think of shooting somebody else's handloads.
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Old 10-22-2010, 12:00 PM
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As a range safety officer, I banned a shooter who constantly showed off his 'OFF THE CHART" loads and bragged about "no pressure signs and very accurate."
After I moved, the next safety officer let him back onto the range.

He persuaded a lady to shoot his magic load, and the gun blew apart, sending her to the emergency room with serious injury to the left hand.

NDI inspection of the blown gun proved there were no defects in the gun metal before the failure.

Pointless and dumb. That's what I think of shooting "off the chart" reloads.
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Old 10-22-2010, 05:06 PM
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I think I will back 'em down some. I pulled one of these bullets down today and found they were loaded with 66.8 grains! The 1885, B-78’s and No.1’s are stout guns, this load in something else might cause problems but I did find a load in my Lyman book that is very close to the 65 grains of IMR 4350. I’ve got some 120 HP’s to try that I loaded, hope they do good.

J.B.
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Old 10-23-2010, 07:07 PM
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I think I will back 'em down some. I pulled one of these bullets down today and found they were loaded with 66.8 grains! J.B.
Which illustrates why I NEVER shoot somebody else's reloads. One case that is old or has been reloaded once too often combined with a serious overcharge of powder leaves you with a lot of very high pressure gas and brass particles looking for some place to go.
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Old 10-23-2010, 08:23 PM
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Quote:
Originally Posted by Nard View Post
I think I will back 'em down some. I pulled one of these bullets down today and found they were loaded with 66.8 grains! The 1885, B-78ís and No.1ís are stout guns, this load in something else might cause problems but I did find a load in my Lyman book that is very close to the 65 grains of IMR 4350. Iíve got some 120 HPís to try that I loaded, hope they do good.

J.B.
Good move. Work your way down and you will probably get just as good accuracy, plus you can shoot them with no worries. Whatever you shoot with them will never know the difference.
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Old 11-10-2010, 09:08 PM
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Default hmmm

I find that there is alot of variation in guns, chamber length, and powder and case capacity. Reloading books just give you a place to start at. Like yesterday I was loading .222 remington. The book said that I could expect 3100 fps from 20 grain of powder and I only had 2254 on my chronograph. That said if someone showed me a load that was clearly over the book I would start lower with the same ingredients and work my way up.

So basically if I had no pressure signs I would shoot the same case with that load in it to see how long it took for the case to hit maximum overall length. Often times you won't get pressure signs for the first time that you fire a hot load in a case. Then after like 4 shots it starts to show pressure signs. If you had a chronograph that would tell you even more.
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Old 11-12-2010, 02:07 AM
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I shoot my dad's 1964 M700 in 7mm Mag. Some of the brass is about 40 years old and is still being loaded with the same load of 68 gr of IMR 4350 with a 139 gr Hornady or 140 gr Sierra bullet. A similar load, but not the same, is published in Speer #7, but we use a standard Remington 9 1/2 primer instead of a magnum primer. Speer #7 says a 160 gr bullet can be loaded with 64 gr of IMR 4350 with a magnum primer. The use of magnum primers reduces the amount of powder that can be used safely. There isn't any reason to use a magnum primer with IMR 4350, but if you do, just back the load down 1 gr.

Before anyone brings up the "changes in powder", the same load with new IMR IMR 4350 is within 10 fps of the old DuPont IMR 4350 when shot in the same gun.

It might be a good idea to break down the ammunition you have and reweigh it so it's actually 65 gr.

The 100 yard groups look like this.

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Old 11-18-2010, 05:34 AM
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Quote:
Originally Posted by Nard View Post
I have an 1885 Browning in 7 mag. And have been trying several loads, went by a buddyís place today and tried three loads and then he offered a fourth one to try. 145 grain Speer Grand Slam loaded with 65 grains of IMR 4350. Donít look for it in the book, they donít go this high! LOL Just wondering if anyone else has had any experience with a similar load. I didnít see any pressure signs and got a three shot 100 yard group that was just over Ĺ an inch.

J.B.
JB sometimes you have ask yourself how dead is dead.for my hunting loads accuracy means more than speed.I have seen lots of guys push the 7 mag hard and they are shooting 100 lb texas deer.IMHO work up a load and find the sweet spot for your rifle.there isn't a deer here in the lower 48 that can take a 145 gr GS bullet @ 2500-2600 fps and walk off if you put it where in belongs.I haven't had one of my bullets bounce off a deer yet.
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Old 11-19-2010, 08:29 PM
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thats a shooting house gun, i would find a 165 or 175 gr bullet that would shoot in that 85 for long range you need a heavy bullet with that long barrel it should bring up your fps some thats just my thoughts on that gun, i would use it as a bean field gun, if you get tired of the 85 you just let me know!
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