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  #1  
Old 04-08-2007, 12:27 PM
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Marlin .308MX range report (pictures)


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I brought my new 308Mx to the range today. I picked this gun up yesterday. Installed a leupold vx2 2-7 scope, weaver bases and rings. The rifle loaded, cycled, fired, extracted, and ejected fine. 2 rounds I had to squeeze the lever a little extra to chamber the rounds.
1st 5 shoots 1-2518, 2-2486, 3-2449, 4-2465, 5-2486
2nd 5 shoots 1-2469, 2-2514, 3-2468, 4-2486, 5-2464
average vel. 2480 extreme spread 69 air temp 38 degrees target shot at 50 yards

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  #2  
Old 04-08-2007, 12:54 PM
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Yeeha!
I sure need to find out who has them. Texas Gun Shop in San Angelo told me last week he still cannot order them yet.
Where will you start your handloading?
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  #3  
Old 04-08-2007, 01:14 PM
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Slim
My dealer got this rifle from a dist. in Penn. I will order dies tom or tue. I will probably start my loading around the .307 Win. Would you? It is a nice shooting rifle, I expected more vel, maybe the cold temps?
Karl
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  #4  
Old 04-08-2007, 02:48 PM
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Quote:
Originally Posted by marlin shooter
I expected more vel, maybe the cold temps?Karl
Karl Your about where we figured when we were looking at the math. You are about 80 fps below where we thought the 150-grain bullet would be in the 22" barrel at 50,000 CUP. Warmer weather will give you a rough 40 to 50 fps. Lets estimate just over 2,500 fps with the 160-grain factory load on a 70 degree day. I'll be very happy with this performance. It's not quite a .307 but the .308ME does not quite have the same case capacity.
.307 start loads should be a good starting place. Any standard production rifle will require a break in period but your looks like it is going to shoot well.
What does the crimp look like? Could there be a slight buldge at the crimp that caused the hard chambering?
I'll join the fun as soon as I can get the rifle on order.
In the mean time I'll work your figures backwards to see what they look like with IMR powder.
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  #5  
Old 04-08-2007, 04:32 PM
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It sure is a good looking rifle, I wish I could get a 30-30 like that.

I bet you are pretty badly fouled with copper after those first five shots. It took a goodly many rounds to smooth out my 336XLR barrel.
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  #6  
Old 04-08-2007, 06:52 PM
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“1st 5 shoots 1-2518, 2-2486, 3-2449, 4-2465, 5-2486
2nd 5 shoots 1-2469, 2-2514, 3-2468, 4-2486, 5-2464
average vel. 2480 extreme spread 69 air temp 38 degrees target shot at 50 yards”

I took a quick look at your data. Using the 150-grain Speer bullet seated .360” deep for a COAL of 2.500” the Powley Computer says 38.2 grains of IMR 4895 will give you 2,482 fps at 43,480 CUP.
In my 20” Winchester .307 42.0 grains of Hodgdon 4895 pushes the Spee150-grain JFN at 2,529 fps.
43.0 grains of H-4895 pushed the 150-grain Speer bullet 2,606 fps. You may increase your velocity slightly by switching to the Sierra bullet with its .307” diameter.

In 1950, with the help of Remington Arms Company, Charles Cummings put out a little book titled: “Everyday Ballistics.” In a chapter titled: “What Price Barrel Length?” he lists the 150-grain .300 Savage load as giving 2,670 fps from a 24” barrel and 2,640 fps from a 22” barrel.
My fastest 150-grain loads in the 20” .307 Winchester just exceed 2,700 fps. I prefer to stay in the 2,600 to 2,650 fps range for top loads.
I believe most of us will be well served by the .308 Marlin Express and its new rifle.
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  #7  
Old 04-09-2007, 01:04 AM
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I am thinking more velocity with higher temps. However during deer season the temps may not even hit 38 degrees. Makes no difference to me, If I can get a 150 into the 2500 fps or a 170 into the 2450's it will take care of what I point it at. It is a nice shooting rifle. The first 5 shot group was from a clean barrel and the first rounds fired from the rifle. I was happy to see no stringing or flyers. I like the rifle and look forward to working with it. It will be nice when you other guy's get some and we get some data going.
Karl
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  #8  
Old 04-09-2007, 02:42 AM
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Quote:
Originally Posted by marlin shooter
Makes no difference to me, If I can get a 150 into the 2500 fps or a 170 into the 2450's it will take care of what I point it at.
Karl
Your 150-grain goal is easily achieveable with the 20" .30-30AI. Your 170-grain goal is possible - but at absolute maximum in my rifles - in the 20" .30-30AI. I predict no difficulty exceeding your goals safetly in the .308ME. I am looking forward to sharing data and hunting experiences with you.
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  #9  
Old 04-09-2007, 05:16 AM
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Quote:
Karl Your about where we figured when we were looking at the math. You are about 80 fps below where we thought the 150-grain bullet would be in the 22" barrel at 50,000 CUP.
I hope this pressure figure is a misprint. I don't believe the Marlin action can handle that much pressure safely.

Regards,

Grizz
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  #10  
Old 04-13-2007, 04:04 AM
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What components are you using for the reloading? I talked to Hornady and they said they were not selling the leverrevolution bullets for about another year. What brass are you using and where can I get it? I am in the process of buying one and having a heck of a time finding all the components? How about reloading data? I tried Hodg and a few others with no luck. Can you help me out? Thanks...

Last edited by rc109a; 04-13-2007 at 04:13 AM.
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  #11  
Old 04-13-2007, 12:17 PM
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rc109a
I was shooting the Hornady factory ammunition. I have not received my dies yet. I will start my reloading around the starting loads for the .307 win. I have speer 150 and 170 grn bullets I'll try. Have you found a rifle yet? Good luck and be sure to post your results.
Karl
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  #12  
Old 04-14-2007, 06:48 AM
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Hey Guys,

I've just been reading an article in the "Rifleman" about the new 308ME. It's being loaded with a newly developed "double based ball powder" that is not currently being offered to the public.

Might this not cause a problem safely duplicating factory ballistics?

Lobo in West Virginia
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  #13  
Old 04-14-2007, 10:41 AM
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Well done Rifleman.
It looks as if a magazine has finally found a writer who can relay facts without changing or embellishing them.
Who is Chad Adams?
Adams reference to the origins of the Express are well thought out. His description of the powder and how it enables the cartridge to reach its potential is clear.
The reference as to the origin of the cartridge case - .307 Winchester – and why it is different is well expressed.
His chronograph results of about 100 fps shy of advertised velocity are believable and realistic considering the rifle has a production chamber.

If I had to criticize anything it would be that the comparison ballistics graph does not include the .307 Winchester. In his defense I must concede the .307 and Winchester are gone. There are few .307 Winchester rifles in use and there is no point in confusing the public with cartridges they have no familiarity with.
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  #14  
Old 04-14-2007, 10:48 AM
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I pulled apart 1 of my factory rounds and it containrd 41.8 grns of what appeared to be a ball powder.
Karl
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  #15  
Old 04-14-2007, 11:43 AM
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Karl,

Using the bullet dimensions you sent I have been working the slip stick on Homers magic computer.
Using a 24” barrel with 22.555” of effective barrel length and seating the 1.154” long bullet to a COAL of 2.530” - .475” inside the case. Using a charge weight of 41.8 grains of powder the Powley Computer says IMR 4320 (I would also use Alliant RL 15) will give us 2,543 fps at 46,100 CUP.
This compares very favorably with Mr. Adams chronographed 2,563 fps average from his shiny barrel 24” .308 ME.

My math says this is an 86% load density and the computer predicts 61 fps per grain of powder. As I said, I don’t think we are terribly handicapped by not having the high-energy powder or pointy bullets – certainly not to 225 yards as Adams was shooting at antelope. He could have made the same shot with a Speer 170-grain bullet using any one of several powders and he would not have needed the trick reticule scope – although I am not criticizing him or his equipment. I liked the article.
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  #16  
Old 04-16-2007, 12:25 PM
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I sent you a P.M.
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