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jim-ma
Starting Member
USA
5 Posts |
 Posted - Oct 24 2009 : 13:48:49
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| I have a Remington 700 BDL in 7mm SAUM stainless synthetic (injection molded stock). This is the most accurate hunting rifle I have ever owned. I consistently get 3-shot groups under 3/4". The problem I am having is that my group moves when the temperature changes or I hunt at a different elevation that I sight in at. I missed a nice muley buck this year. I want to buy a quality fiberglass stock. Some stocks I have looked at have a large machined aluminum blank inside the stock for the action to rest against. I am a machinist and know the effects that hot and cold have on aluminum. It moves as the temperature changes. I am worried that by switching to a stock with aluminum blank I will not get rid of my problem. Has anyone had any experiences or expertise in this area? |
Jim |
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IraqVet2003
Advanced Member
USA
1206 Posts |
Posted - Oct 24 2009 : 14:18:15
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| Your best bet is a good stock like McMillan or a good laminate. Some laminate stocks have layers of kevlar between the layers of laminate wood. Vet |
Edited by - IraqVet2003 on Oct 24 2009 14:19:25 |
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jim-ma
Starting Member
USA
5 Posts |
Posted - Oct 24 2009 : 16:30:10
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| That is pretty much as I figured it. I have been looking at McMillan and MPI. They are both pretty spendy, but if it keeps my groups from moving it will be worth it. |
Jim |
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IraqVet2003
Advanced Member
USA
1206 Posts |
Posted - Oct 24 2009 : 16:34:31
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| Yeah its one of those things you get what you pay for. But a good Fiberglass-kevlar stock or laminate will indeed keep you groups from wondering as long as its bedded properly. Vet |
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jim-ma
Starting Member
USA
5 Posts |
Posted - Oct 24 2009 : 17:14:42
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| Thanks for the reply and thanks for your service. |
Jim |
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RaySendero
Average Member
USA
142 Posts |
Posted - Oct 25 2009 : 09:10:10
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quote:
Originally posted by jim-ma
I have a Remington 700 BDL in 7mm SAUM stainless synthetic (injection molded stock). This is the most accurate hunting rifle I have ever owned. I consistently get 3-shot groups under 3/4". The problem I am having is that my group moves when the temperature changes or I hunt at a different elevation that I sight in at. I missed a nice muley buck this year. I want to buy a quality fiberglass stock. Some stocks I have looked at have a large machined aluminum blank inside the stock for the action to rest against. I am a machinist and know the effects that hot and cold have on aluminum. It moves as the temperature changes. I am worried that by switching to a stock with aluminum blank I will not get rid of my problem. Has anyone had any experiences or expertise in this area?
quote:
Originally posted by jim-ma
That is pretty much as I figured it. I have been looking at McMillan and MPI. They are both pretty spendy, but if it keeps my groups from moving it will be worth it.
Jim,
Just my 2 cents:
The problem you describe could possibly be caused by other issues than the stock! I would want to be sure it's the stock before spending $$$.$$ for another stock. I assume, from your description, that you can't reproduce the problem at the same range session so have concluded its the effect of temp/elev on the stock?
You may have already done some of this, but I would: 1) check barrel for free-float cold and after it heats up; 2) Check POA clean then check POA again; 3) Put scope through workout - shoot groups clicking scope right, up, left and then back down to original setting.
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jim-ma
Starting Member
USA
5 Posts |
Posted - Oct 25 2009 : 10:19:20
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I am pretty sure the problem is the stock. Here is the story...
I sighted in at home two week before the season and had a 3 shot 5/8" diameter group that was 2.25" high at 100 yds (500ft elevation). I missed a nice buck in Eastern Oregon at 200 yds. I set up at target in camp at 100 yds. The rifle shot about 5" high. That was roughly 2.5" higher that when I shot at home. My side to side was dead on. I cranked the scope down 10 clicks and it put me back to my original zero at +2.25".
Upon returning home, with a cold clean barrel, I shot a 7/8" 4 shot group that was 3/4" high at 100 yds (three of the shots were touching each other at about 3/8" group). That means my zero moved approximately 1.5" down from when I re-zeroed at camp.
Next we packed the rifle and stock in ice and let it sit for about 45 min (I did not check to see if the stock contact points were still touching the barrel). My next group was a 3/4" dia 3-shot group that moved up to 1.25" high (I am surprised the group did not move down). We then took the rifle in the shop and put it in front of the heater for about 30 min. The stock and barrel was nice and warm. My next group 3-shot group was 2.25" high. Two of the shots were touching at 2" high and one that was at 3" high (1.1" dia group).
We then let the rifle sit on the bench for about an hour to get back to the temperature outside. The last group I shot was back at 3/4" high (a little bigger than 3/4" diameter group). It went right back to where it was when I started. No adjustments were made to scope during the 4 strings.
Pre-hunt home +2.25
Hunt +4.875
Hunt +2.25 after adjustments
Home +.75
Ice cold +1.25
Heater warm +2.25
Last string +.75
It sure sounds like the stock is affected by hot, cold, and atmospheric pressure. Anyway, you can bet that from now on I will re-zero my rifle at camp next year regardless of which stock is on the rifle.
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Jim |
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jim-ma
Starting Member
USA
5 Posts |
Posted - Oct 25 2009 : 10:21:31
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| The elevation where I was hunting was around 3700' |
Jim |
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Fiberglass stock upgrade
