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How can you tell if pressure is to high

 
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  #1  
Old 03-18-2002, 07:23 AM
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Join Date: Oct 2001
Location: Livonia, MI
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How can you tell if pressure is to high

I was playing with the chronograph this weekend. I ran my 308 rounds throught and they were on the money at 2600 fps (168 gr MK for Hi-power Silhouette shooting). Then for the heck of it I ran some of my 338 Lapua rouns over the Chrony. Dave I used your old load load for the 200 gr Nosler Ballistic tip (103.4 grs of N165). I came out with a average speed of 3550 fps. I though this was rather high. So now I am worried about pressure. The primers look fine, there is no cratering around the firing pin, the bolt is not heavy (maybe a little heavier than a factory load but easily worked with one hand).

My 338 Lapua is a TRG-S action with a Hart 28 inch barrel and a 2" brake.

Matt
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  #2  
Old 03-18-2002, 07:49 AM
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Re: How can you tell if pressure is to high

Matt
That load with the powder LOT I was using was 3420fps. It's the same speed we were getting from the TRG-41 with the 27.5 inch 1x11 barrel. I'd suspect the LOT has a bit to do with the higher velocity.

It won't hurt to slow them down a bit, it's just a few extra "clicks" on the scope for a slower round and that's a small price for safety.

/r
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Old 03-18-2002, 11:55 AM
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Re: How can you tell if pressure is to high

Dave,

I was planning on slowing them down a bit. I do not need the extra velocity. My concern and I would like to get your opinion on. I loaded a box (20) of these and have 12 left. Should I shoot them or pull the bullit and reduce the powder charge.

By the way I read your post on your new 338 Lapua. Sound like a real nice gun. What did you do with the HS Presion 338 Lapua you had built when you sold me this one?

Matt
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Old 03-18-2002, 02:05 PM
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Re: How can you tell if pressure is to high

Dave,

What made the HS guns so slow??

Matt
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  #5  
Old 03-18-2002, 04:16 PM
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Re: How can you tell if pressure is to high

Matt

I don't have any idea why they were slow but they were all the same.
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  #6  
Old 03-18-2002, 05:09 PM
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Join Date: Dec 2001
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Re: How can you tell if pressure is to high

Dave

What made you decide on a CZ 550 action over the Sako TRGS for your new 338 lapua? What are you doing for the CZ trigger, I heard there aren't any match triggers for them?

Did you get a chance to shoot George Gardners 338 lapua, if so can you tell me about it, how did it shoot?
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  #7  
Old 03-19-2002, 12:42 AM
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Re: How can you tell if pressure is to high

Matt

If you're asking my advice on the remaining rounds I can only offer one suggestion and that would be to pull the bullets. This is the nature of the beast and the only reply I can make.

The H-S Precision rifle was very slow as compared to the Hart/Sako rifle you have. I traded that thing away like it had demons...glad to be rid if it (the new owner had barrel work done and is pretty happy with it). Al's isn't any better and he's having it rebarreled after about 100 rounds and the third one, the one the fella in Riesterstown bought was traded off long ago too.

[ 03-18-2002: Message edited by: Dave King ]
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