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POI Drift 300grain Matchkings 338LM?

 
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  #1  
Old 10-17-2003, 12:02 PM
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POI Drift 300grain Matchkings 338LM?

Made my first 300 MK loads yesterday, got some nice groups but also some flyers every now and then. I thought it was bad shooting because it was getting dark but today the thing was still there,in a good light. I used only one load today.

I have a stock Sako TRG-S. Shot a bunch of 250 Scenar moly factory rounds with less than half an inch groups and never noticed this drift. So:

With the MK:s the first shot from a cold barrel is there. Right where its supposed to be,yesterday and today. Vertically the same as Scenars. The temp is arond 30F now so I let the barrel cool down for only five minutes between the shots.

What happened was that the POI drifted to the left again, just like last night but now it actually stayed there,I got the best groups at more than an inch to the left. This is only 100 yds shooting here, testing.

After a few rounds it started to drift back to center, got 1/2" groups again but closer to the "starting" POI,verticalwise. ???????

Is this just bad shooting or what? Any experience appreciated,I used a decent bench, maybe the rear support could be better. I also had the bipod attached but folded to "carry" position for some real world weight.

Here you can see what is going on. The first one is there,then the 1/2+ inch group is somewhere else. After some groups it moves back towards the center and yesterday I got two 3/8" groups as well -but in a wrong place. I have shot only moly 250 factory Scenars before and this is something new.



The load was only 2595fps because of the 26" barrel but it is fine for my hunting purposes. 85 grains of VV N165,standard COL, CCI 250 Magnum primers. SD for ten rounds was 16.

Any ideas? Id be quite happy with this for 500 yds moose with 1/2" grouping but the drift is no good. The scope is fine,Scenars shoot where they are supposed to. Plus,the twist is 10", not 12". Is it just the heat? If so,why does it drift back? [img]images/icons/confused.gif[/img]
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  #2  
Old 10-17-2003, 12:33 PM
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Re: POI Drift 300grain Matchkings 338LM?

I dont know if it could be causing it, but i would scrub the hell out of the moly that you laid down and shoot some naked rounds and scrub the hell out of it again. The residual moly needs to be shot out before you try to find a load for a naked bullet. Things will be inconsistant with the moly left in there.

if that is not the problem you could try a cryo treatment to relieve stresses in the barrel maybe??

JB--o yea, i hope you dont mind i borrowed your signature.

[ 10-17-2003: Message edited by: jb1000br ]
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  #3  
Old 10-17-2003, 03:11 PM
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Re: POI Drift 300grain Matchkings 338LM?

Yhanks for the reply JB,

moly... sheesh,Ive heard about this. Just another thing to learn by trial and error. I did some careful "breaking in" with the moly stuff,later I heard that it may not be the best idea. That was all I was able to get, moly Scenars.

Dang,can I just shoot the moly out or does it need mucho manual scrubbing? Or... what if I molycoat the Matchkings? [img]images/icons/shocked.gif[/img]

Kinda makes sense now. Anyway,I will see the 300 grain MK story till the end, moly is a minor nuisance here,I will get rid of it one way or another.
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Old 10-17-2003, 06:52 PM
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Re: POI Drift 300grain Matchkings 338LM?

The TRGS has a very inadequate recoil lug, especially for such a robust cartridge. Could be shifting the point of impact.
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  #5  
Old 10-17-2003, 10:17 PM
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Re: POI Drift 300grain Matchkings 338LM?

Thanks Len. Maybe it needs to be worked on, gotta call Sako folks and see about that. It should be a warranty job in this case.

Still wondering why this does not happen with Scenars...??? And why the first round is always right in the spot?

Well, moose time, 45-70 dog guide fun. More comments welcome.
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  #6  
Old 10-28-2003, 02:56 AM
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Re: POI Drift 300grain Matchkings 338LM?

Its the recoil lug / bedding thing. [img]images/icons/mad.gif[/img]

Something "gives" a little, this sideways drift is a known problem,I talked to some people who had heard about that too.

What should I do now? Take half an hour breaks between the shots? A bedding job? I can live with the stock otherwise.

Ideas,please? Re- stocking is not an option now although it would fix the problem. Ill see if I can fix it with the existing stock.
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  #7  
Old 10-28-2003, 07:06 AM
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Re: POI Drift 300grain Matchkings 338LM?

Check the stock for fit and make sure the barrel channel is not touching the barrel at all.

Recoil lug would be suspect to.

Later
DC
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