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Question for Cooper owners?

 
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  #1  
Old 05-19-2013, 12:22 PM
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Join Date: Sep 2012
Location: Nova Scotia, Canada
Posts: 84
Question for Cooper owners?


My new rifle arrived and I got to take it to the range for the first time. I followed the break in procedure recommended by Cooper. The only ammo I had was a box of 140gr Remington factory rounds and some handloads that were left over from another rifle (the load has shot very well in several other 7mm-08's).
The first 6 shots were used to get the rifle sighted in. This is the first bolt action I have not been able to get on the paper by bore sighting and I've done a lot of them. Strange. Not sure if there's something weird going on with the bedding or what?
The first group fired with a clean barrel for each shot (shots 7-9) grouped 2.4" for three shots with the Remington factory load.
The next group fired with the barrel fouled grouped four rounds in 1.54".
The next group fired with the same handload grouped four rounds in 1.46". However, the first shot from a clean bore was out of the group. The next three went into .51".
The final group was again with the Remington factory load and it was 2.4" for five rounds.
The barrel seemed to foul pretty bad at first but improved some as more shots were fired. It still fouls noticeably more than my Hart barreled 300 Win Mag. The test target also seems not as good as others I've seen posted. It does work out to just under 1/2" at 100 yds. if it was fired at approx. 44yds.

I'm curious from other Cooper owners if this is this typical for how other Coopers shot during the break in period? I have a total of 22 shots through the rifle with no attempt at load development.
I was moving my scope between some of the groups so ignore the point of impact.

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  #2  
Old 05-19-2013, 05:40 PM
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Join Date: Aug 2003
Location: NC, oceanfront
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Re: Question for Cooper owners?

You might atleast develop a load for it
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  #3  
Old 05-19-2013, 06:25 PM
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Join Date: Sep 2012
Location: Nova Scotia, Canada
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Re: Question for Cooper owners?

I plan to develop a load. I just got it a couple days ago and only had time to shoot it the once. I was just curious how owners of other Coopers found they shot during the first twenty or so rounds?
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  #4  
Old 05-20-2013, 12:59 AM
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Join Date: Dec 2011
Location: Billings, Montana
Posts: 29
Re: Question for Cooper owners?

I bought a Cooper 56 in 300 win mag a month ago. I started shooting 215 bergers right away and shot this group after 15 shots. I was and have been pleased.
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  #5  
Old 05-20-2013, 05:58 AM
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Join Date: Sep 2012
Location: Nova Scotia, Canada
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Re: Question for Cooper owners?

I've got some 140gr Bergers I'm going to try when I get a chance. It seems like it rains here every weekend!!
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  #6  
Old 05-20-2013, 09:56 AM
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Join Date: Sep 2010
Posts: 99
Re: Question for Cooper owners?

A couple things to check.

* A call to Cooper and check action screws? Just maybe? Have no idea what they recommend.
* Check all scope mounts, I know. We both have done it so many times correct. This got me a couple years ago.
* It might shoot a lot better after the first shot or two. Or a fouled(dirty) bore.

I picked up a Cooper 54 in 6.5 Creedmoor. It groups well, but shoots best dirty. I would not take hunting on a clean bore. I usually shoot a five shot group before I check group size. I always leave dirty if I'm going hunting soon.

Nice looking rifle by the way, great chambering IMO. Your 139 gr load might be the ticket. I'd like to see 3 groups of that on a dirty bore. Great bullet, and inexpensive as well.

In every hunting rifle of mine Except the Creedmoor, my Hornady bullets were best at .005-.006 jump. If your mag will take that. My Creedmoor seems to like jump, like .080 or more.
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  #7  
Old 05-20-2013, 04:05 PM
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Join Date: Sep 2012
Location: Nova Scotia, Canada
Posts: 84
Re: Question for Cooper owners?

I torqued the action screws to Coopers recommendations before I took it to the range. 35 in/lbs front and 25 in/lbs rear. I rechecked the mounts and all were good. I'm little concerned as to why even after I get it sighted in it shows about 10" difference when sighting through the bore at the target and the scope cross hairs. It's like something isn't straight. I checked a couple of my other bolt guns and both the cross hairs and the bore seem to agree.
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