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Retumbo in cold weather? My rifles suddenly started shooting Low.

 
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  #8  
Old 12-11-2006, 11:44 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Yup - I tend to agree w/papa45. Wholly cow, 12" of drop @ 100 yds sure should be entirely attributed to velocity loss. Though I haven't run the numbers the vel. loss would have to be in the thousands of FPS not 100s.

In a 270 Win w/RL-22 and 140 Hornadays @ 3190 or so in the summer drop to 3060 or so in the winter and don't make much of a difference at all at 200 yds but down range a ways it rears its ugly head.

It will be interesting to learn of your conclusions.
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  #9  
Old 12-11-2006, 11:56 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Would it be possible you are 1 full rotation off on your dial?

I just did some rough figuring for 7mm RUM and what you are talking about would be a 1500-1650 fps drop depending on bullet weight. I also think you have far worse problems than Retumbo temp sensitivity (or appearance of such sensitivity). I only lost 65 fps going from 90 deg. to 35 deg. using Retumbo in 7mm RUM.
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  #10  
Old 12-11-2006, 11:57 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Scope coulda got knocked off while transporting, shooting, or hunting. I've had that happen to me several times. I always try to be extra extra careful when handling guns. I dont like banged up scopes or rifles. Just a thought.
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  #11  
Old 12-11-2006, 12:05 PM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Did you use a mirage shade when you originally did the load work ups in the warmer temps. If not, you could easily see what you are getting in both guns with different scopes. This happened to me and I started shooting 12" low at my zero. Once I started using a mirage shade, the problems ceased to be evident. Also, pilot error could be one of the causes.

James
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  #12  
Old 12-11-2006, 01:08 PM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

I have been shooting Retumbo in my 7STW and I have observed about a 12" difference in drop do to temp change this winter. This is at 723 yards though and the temp. difference is ~ 30 Celcius.
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  #13  
Old 12-11-2006, 01:43 PM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Thats a mechanical issue I would bet, either scope got bumped or something shifted with the stock.

May just be a simple scope bump and you need to rezero.

From hot to cold temps you should see very little point of impact shift if your only shooting at 100 yards. I was referring to long range that you will see a bullet drop going from hot to cold temps.

Rezero your rifle and see what it does with a proper +2" at 100 yard sight in.

Kirby Allen(50)
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  #14  
Old 12-11-2006, 01:44 PM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

It may just be coincidence that it happened to 2 rifles?
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