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Thread: Sako 85 300 WSM Barrel Break In

  1. #1

    Default Sako 85 300 WSM Barrel Break In

    I have finally got my Sako 85 Finnlight 300 WSM set up with a Nightforce NSX 5 x 22 x 50, NP-R2 reticle. I’ve taken it out 3 times this week for some load development with 180 gr E-Tips and 168 gr TTSX’s. I’ll be posting the final results of that in the next few days.

    Due to technical difficulties (low battery in my chrony) I only fired 4 shots on my first outing. On the second outing I got another 6 shots fired before I was chased by some rain and sleet. I shot 18 more rounds the third outing with a little more shooting to do tomorrow. So over the course of 3 outings, I shot 28 rounds, 21 E-Tips and 9 TTSX’s

    Anyway, I did a barrel break in routine with the rifle. I cleaned it after each shot with a Dewey rod and Butch’s Bore Shine for the first 14 shots. I was planning on using Montana Extreme but upon closer evaluation of the label I found that it was the Rimfire version. So not knowing what the difference was I grabbed the Butch’s I had on hand went to my shooting spot up the road in the Hyalite foothills.

    I soaked patches and ran them through until the heavy powder was gone. Then I did a couple of other miscellaneous time killing chores such as recording data, checking my target ( an old piece of 2’x 3” plywood… I used various knot holes for aiming points), etc., while the bore soaked for a few minutes. Then I soaked a few more patches and stroked them back and forth until all significant blue/green color disappeared. Then I ran a few dry patches through before firing again. The whole cyclical process from one shot to the next took about 10-15 minutes. After the first outing I brought the rifle home and soaked it with Wipeout a couple of times for a couple hours each and removed some significant copper residue and soaked it overnight for the final spotless cleaning.

    After the 3rd shot (7th shot total) on the second outing I was noticing significantly less copper residue in my cleaning. Again, that night I soaked a couple of times and overnight with Wipeout and got less but a fair amount of copper residue out of the cold-hammer forged barrel.

    After the 3rd shot (13th shot total) on the third outing, copper fouling ceased. Not a hint of it after that with the E-Tips. After the 14th total shot I began cleaning after every second round, corresponding to my incremental powder increases. After the fourth TTSX, I noticed a very little bluish color on the first dry patch, but nothing more after that. That night, I again soaked the bore with Wipeout once in the evening with no copper residue and then again overnight. In the morning when I patched it out, there was only a very slight, almost undetectable violet color in the residue that came from the bore.

    This makes me a happy camper. Nothing like a no-copper-fouling barrel. So I think there is something to this barrel break in process. I know I will do it for every new barrel I get.

    Looking back, I think I should have soaked the barrel overnight with wipeout before taking it out the first time as the factory test fires their rifles before sending out.

    My experience and input on “Barrel Break In”.

  2. #2
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    Default

    great! I lean towards proper break-in too. Last barrel I broke in was the Super Match from Pac-Nor for my .338-06 chambering in a CRF Win. 70 after the 20th shot, 5 shots of 1 and clean per and on to 3rd set of 3 shot groups of 5 was no evidence of fouling. I pursued the procedure till the last of the 5 groups of 5 shots and clean. Superb accuracies!

    it is a good thing.

  3. #3

    Default

    Quote Originally Posted by grizz106 View Post
    great! I lean towards proper break-in too. Last barrel I broke in was the Super Match from Pac-Nor for my .338-06 chambering in a CRF Win. 70 after the 20th shot, 5 shots of 1 and clean per and on to 3rd set of 3 shot groups of 5 was no evidence of fouling. I pursued the procedure till the last of the 5 groups of 5 shots and clean. Superb accuracies!

    it is a good thing.
    You're right Grizz, it is a good thing. I think it probably helps accuracy, velocity and barrel life and my rifle will be a lot easier to clean. All I have to do is clean the powder out now and that takes about 1/3 the patches as before and a lot less time.

  4. #4

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    Took the rifle out again this morning and put 17 more rounds through it. 6 E-Tips, 5 TTSX's and 6 HAT's (Henson Alunminum Tipped) bullets. I cleaned after each set. No evidence of copper from wet patching them. There was a very slight blue color on the first dry patch after cleaning the E-Tips and TTSX's but no other sign of copper. When I got home, I soaked the bore with Wipeout for 5 hrs, and then pushed a patch through it and it was colorless. Very satisfying.

    Now I just need to find the best loads

  5. #5
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    Default Hey montana

    I have a sako 75 in 300 wsm, I just worked up some 168gr ttsx with win brass and wlrm primers with 68gr of Imr-4350 seated @ 2.904" groups 3/4 @ 100yds and 3" @ 300yds. I don't have a chrono yet so I don't the fps, no signs of excessive pressure yet but its close to max.

  6. #6

    Default

    Hey Gotmudd, my max for the 168 gr TTSX's is 65.5 of H4350 With velocities near 3100 fps. I haven't fired then in a while because I'm trying to get a lod worked up for the 189 ETips. which have been real inconsistant. I got .454 group the other day, then when I went bak out to confirm it it went to over 3 inches and the POI shifted. I'm seating my bullets at about 2.910

    Between work and weather, I haven't had much chance to shoot.

  7. #7
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    Default montana

    Good luck with the e-tips, I haven't tried those yet.

  8. #8

    Default

    That's supposed to be 180 gr ETips, along with all my other typos...

  9. #9
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    Thumbs up Detailed & informative post Montana

    Over the years I have done pretty much exactly what you described, using the exact same equipment and solvents when breaking-in a new barrel. My results have been uniformly the same as yours...minimal to no copper fouling and a much easier cleaning process in the future. The issue of break-in or not has been debated periodically over the years on our forum, and it has always been my position that it is time well spent if done correctly using the right equipment.

  10. #10

    Default

    Thanks Doc, I now have a well broke in barrel that sometimes shoots half inch groups and sometimes 3 inch groups And real cool to hear some else did the same process with same results, thanks for sharing.

    Now all I gotta do is figure what this rifle likes, if it likes anything

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