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Microlon Gun Juice Results

 
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  #1  
Old 08-26-2010, 11:58 AM
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Microlon Gun Juice Results

Thought I would share my findings after treating my barrel with GJ. I would like to thank "Phorwath & MontanaRifleman" for their help and insight on this endeaver.

Microlon has come out with a new method for treating a barrel. I modified the procedure a little but the end results were the same. The rifle I treated is a 338 Lapua Improved. Lilja 30" fluted, 1-10 twist with a #8 contour. I broke the barrel in 1st and after 35 rounds down the tube i started the GJ treatment.

I stripped the rifle down to barreled action. I used a rifle cradle to hold the barrel. The barrel was heated to 120-150 degrees using a Snapon heat gun. I used a IR lazer to monitor the heat. Once the barrel reached the desired temp I ran a wet patch of GJ down the bore. I followed up with a wet nylon brush to scrub the GJ into the barrel. I did this two times and kept the heat to it during the entire procedure. Next I started running 1 wet patch through the bore. I waited for each run of the patch to completely dry the GJ in the bore. I repeated this procedure 12 times. GJ instructions called for 8-10 times. I figured a couple more could not hurt.

I also used a Lucas Bore Guide during this entire procedure. Did not want to get any GJ in my chamber. While I was doing the barrel I also treated my Lugs on the bolt and raceways on the Stiller TAC-338 action. I heated the action and the bolt and treated one time.

There was a noticable difference in smoothness when working the bolt with GJ treatment.

Onto the testing. I had chronoed my non-fireformed cases days earlier. At 99gns Retumbo my muzzle velocity averages 2,867 fps over a 5 shot string. It was reccomended by Microlon to back off a little on loads after treating barrel. I loaded 3 rounds at 98gns and noticed a 50fps increase over the last time I had shot at that charge weight.

My next step was to shoot the 15 rounds i had loaded at 99gns. I shot all 15 rounds and let the barrel cool between shots. My Oehler 35P gave me an average increase in velocity of 39fps, velocity was 2,906fps.

Now remember that this was using Virgin 338 Lapua brass that was not fireformed.

Earlier testing with fireformed brass I was getting 2,980fps with 102gns of Retumbo, 300gn Sierra's, .030 off the lands. This was the max load for this rifle before GJ.

I am waiting on Neil Jones custom dies to reload the fireformed brass and see what velocity I can get with the GJ treatment. I think I will be close or a little over 3000fps with max loads. However, I suspect my accuracy load will be under 3000fps. More testing will tell.

I am not very good at all this but hope you guys enjoy .
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  #2  
Old 08-26-2010, 01:37 PM
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Re: Microlon Gun Juice Results

Interesting. Did GJ after breakin myself with a 30" Rock Creek and 338AX and have ended up at 102g Retumbo at 2980fps as my max accurate load. Be interesting to see what your further testing reveals. For the time being, I'm discontinuing ongoing treating after cleaning with GJ as a test to see what, if anything changes...
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  #3  
Old 08-26-2010, 03:37 PM
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Re: Microlon Gun Juice Results

SHRTSHTR,

Very interesting and thanks for posting. That increase in velocity is similar to what I found with my 300 Win Mag and 210gr VLDs. I had to reduce my powder charges following GJ treatment in order to reduce my MV back down to my former accuracy load.

But you never know; your gun might shoot very well at the higher MV obtained with the GJ treated barrel.

One thing's for certain. The new and modified method of applying the GJ treatment is much less labor and time intensive than the former instructions/method.

Good shootin'
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  #4  
Old 08-26-2010, 10:19 PM
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Re: Microlon Gun Juice Results

jmden,
I will be shooting fireformed cases very soon. i am not so concerned about velocity as I am accuracy. I may get both .

Phorwath,
I never tried the old way but am very pleased with the new method. it will be interesting to see if these gains are consistent with time. I have heard that you only have to do treatment one time only.

Hoping to find a accuracy node in the 2900's. I will be pleased if I can accomplish this.
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  #5  
Old 08-27-2010, 08:01 AM
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Re: Microlon Gun Juice Results

Quote:
Originally Posted by SHRTSHTR View Post
jmden,
I will be shooting fireformed cases very soon. i am not so concerned about velocity as I am accuracy. I may get both .

Phorwath,
I never tried the old way but am very pleased with the new method. it will be interesting to see if these gains are consistent with time. I have heard that you only have to do treatment one time only.

Hoping to find a accuracy node in the 2900's. I will be pleased if I can accomplish this.
As I recall, you're supposed to run a patch of the GJ down the bore as the last thing you do when cleaning and then when you get out to shoot run a wet patch through before your first shot. Sound right guys?

Edit: Interesting how 102g is producing exactly the same speed. Several chrono'd 102g loads gave a corrected average MV (ES less than 10fps) of 2982, but I've been using 2980 in Exbal and I need to do more traj. validation work, but seems right on in Exbal at this time.
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In the beginning God created the heavens and the earth. Genesis 1:1

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God?" Thomas Jefferson - Notes on the State of Virginia

www.wildsidesystems.com - Shelter for Your WildSide - http://www.youtube.com/watch?v=tYwgo...&feature=g-upl

Last edited by jmden; 08-27-2010 at 08:15 AM.
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  #6  
Old 08-27-2010, 08:55 AM
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Re: Microlon Gun Juice Results

jmden,
The way I understand GJ treatment is that it only has to be done once. I have heard of people doing what you are proposing. I plan on using the treatment maybe every 200-300 rounds.

According to Microlon, the old method (Your method) is still a viable option. I am a little afraid to run a wet patch of GJ down the bore and then shoot a round. I was going to have my smith do the GJ treatment and he refused to do it. He claimed that he has seen barrels bulged out when the bore was left wet. He claims he used his bore scope to see this. I have no idea if this is true or not.

Whether you have a wet bore and shoot a round or heat the barrel and run a patch. I think you will get the same results. Basically we are baking the GJ to our bores.

I prefer heating the barrel and running a patch. I was able to see light smoke come out of the barrel after running a patch. The patches were almost try when they came out the muzzle.

It would be interesting to know your case capacity. I would bet ours are very close to the same. I did not get low ES with 102 gns of Retumbo. Es was if I remember correctly 24. These were 1st time fireformed cases. I am hoping that with the increase in velocity I am seeing with GJ that I will find an accuracy node close to 2980fps.

I will be trying 102gns Retumbo again in a few days. If everything comes up the way it did in my initial testing...I should hit real close to 3020fps for a max load. I was seeing ejector marks on my cases at 102.5gns. One of the shots at 102.5gns had a slightly sticky bolt. I think I will need to back down 1-2 grns but will not know for sure until I test.
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  #7  
Old 08-27-2010, 01:29 PM
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Location: Alaska
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Re: Microlon Gun Juice Results

Quote:
Originally Posted by jmden View Post
As I recall, you're supposed to run a patch of the GJ down the bore as the last thing you do when cleaning and then when you get out to shoot run a wet patch through before your first shot. Sound right guys?
I would only apply GJ after I knew the bore was stripped entirely clean of any dirt, carbon, or copper fouling. If you do a thorough, complete cleaning of the bore, then I think you could run a wetted patch of GJ down the bore and leave it dry until shooting it the next time. You would basically be adding a treatment to the bore after having thoroughly cleaned the bore. From the GJ instructions and folks, I plan to do that about every 100 - 200 rounds fired down my GJ treated bore. Like maybe once or twice a year based on the rate of my shooting. I don't think there's any need to do this every time you clean your bore, AFTER the initial treatment with GJ has been completed.

SHRTSHTR,

I'm also interested in seeing how long your velocity increase is maintained. If your MV starts to fall off, then maybe that would be the indicator that a maintenance/supplemental treatment is in order? Dunno. I don't have the length of time of experience yet. The velocity increase in my 300 Win Mag seems to have been permanent, at least till now.
Hope you find a sweet spot at just under 3000 fps!
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