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TRG-S 338 LM Bedding Job Results

 
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Old 03-12-2004, 11:34 AM
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TRG-S 338 LM Bedding Job Results

As y´all know I have had problems with this thing. When I switched to 300 Matchkings the weird variations got worse and worse while the best groups got better. The start with this rifle was good but it got bad really fast and since then I´ve been trying to eliminate the possible causes one by one, that includes the shooter.


The downhill started at 200 rounds only, nothing was consistant except every now and then, especially in sub-zero temps things were pretty good. After shooting this five shot group the other day I took the rifle apart. What I found was crap. Pure crap in the real meaning of the word.


Here, 100 meters, bipod and sandbag on cartop, free recoil:




That´s an honest four or five inch group,folks.


You will find more about this job in another thread, anyway I did a careful bedding job including pillars and this is my WORST group of today´s test shooting, the first one after the epoxy dried:



The grid is not one inch, these are just printed targets that are not scaled. This is a 1.2" group having three shots within 0.47" and I didn´t let the rifle cool down at all plus the gun was in room temperature when I started. Low 30´s outside.

I shot five more five shot groups and they all stayed within 1.1 " and the POI drift was 0.4 maximum, logically to the left. That can be the shooter but anyway this is consistant now, as far as I understand.


I really prefer shooting consistant 1.2 " groups with the POI staying there, compared to occasional 0.35" groups somewhere else and then a 4" group every now and then... Within 1.2 MOA I´ll do good up to 500 meters every time when talking about that moose which is my reason to use this rifle in the first place. Whoa.

Do I win money now? Practising got quite motivating all of the suddden. [img]images/icons/grin.gif[/img]
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  #2  
Old 03-12-2004, 11:39 AM
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Re: TRG-S 338 LM Bedding Job Results

Quite an improvement. Does your rifle now have an after-market recoil lug?
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Old 03-12-2004, 01:57 PM
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Re: TRG-S 338 LM Bedding Job Results

No it doesn´t.

In case this will not hold I´ll make a new lug and strengthen it up by bolting it through the sides. But the lug looked healthy, the problem has been in the fit so that the bolts have had all too much to do during recoil. Now the lug is finally at work.
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Old 03-13-2004, 02:24 PM
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Re: TRG-S 338 LM Bedding Job Results

Petander,

A good freind of mine pointed out to me the other day something about Sako's. he has had several and does the same thing to each one. Once he has found his pet load he loads up about 25 of them and heads to the range. What he does is he takes a inchpounds (not foot pounds) torque wrench and tightens the action screws(or whatever they are called) to 30 inlbs and shoots a 3 shot group, then he tightens to 35 inlbs and shoots another group. he goes all the way up tp 50 inlbs. at that time he will then evaluate which setting yeilded the best group. Every gun has been different. the groups have varied as much as 3" in size. His latest gun shot a .6" group at 300 yards after doing the adjustment. Might be something to try and I am going to try it on my TRG-S as well. I usually just tightend them as tight as I could before.
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Old 03-13-2004, 07:23 PM
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Re: TRG-S 338 LM Bedding Job Results

Petander,
Nice improvement there! That's got to be refreshing!!

Sako,
One three shot group -
I guess you could tell what "didn't" work very quickly, just like one 3 shot group during any other test of something else might show too, but is this how he approaches it, i.e. heading away from poorest groups type deal and not necessarily focusing on the tightest one, possibly a "lucky" group?

I've heard of guys checking the same thing with reguard to tightening the clamping force on their barrel blocks to barrel, to tune them also. Something else I'll have to play with now. [img]images/icons/grin.gif[/img]
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Old 03-13-2004, 10:23 PM
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Re: TRG-S 338 LM Bedding Job Results

Brent,

By the time he has his pet load figured out he has a pretty good idea of what the gun is capable of. His shooting skills are top notch as well so that helps. He showed me the results of one said test and you can definatly tell where the sweet spot is. Of course once he is at that point he does several groups to rule out a "fluke". suprisingly it isnt always the tightest that is the best. He has 2 of the identicle gunsa and one liked 30 inlbs and the other liked 45-50 inlbs.

Sorry I'll be quiet now, I dont want to highjack the thread. Just thought that might help Petander get even better than his already awesome results. By the way can anyone point me towards his bedding thread?
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  #7  
Old 03-13-2004, 11:11 PM
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Re: TRG-S 338 LM Bedding Job Results

Thanks Sako.

Just thought that might help Petander get even better than his already awesome results. Only reason I asked. [img]images/icons/smile.gif[/img]

Petander

You've got me excited now! I hope my sons 308 shows that kind of improvement also!
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