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

 
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  #1  
Old 12-10-2006, 08:11 PM
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Retumbo in cold weather? My rifles suddenly started shooting Low.

I shoot 7 RUM and 338 Lapua both with retumbo loads. The weather here got real cold and the load are suddenly shooting significantly lower. Has anyone had this problem with retumbo?
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Old 12-11-2006, 12:40 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

At what range?? At your zero or at some distance beyond your zero?
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Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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Old 12-11-2006, 02:33 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Roll-Your-Own, Velocity has probably dropped off with the cold. Less velocity, more drop. Even extreme powders are not totally stable with temperature changes. Are you using a magnum primer? I assume so, but magnum primers help as the temp drops. [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Old 12-11-2006, 09:40 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

Roll-Yur-Own,

There is no way to get a load that shoots the same in warm and cold weather. In my experience, the larger the case capacity and the smaller the bore, the more variation you will see as far as bullet drop changes in different temps. This will happen with any powder, yes some powders will be better then others at limiting velocity change in different temps but I would say your using one of the better powders already.

Only way to know is to shoot in these different conditions and make notes of it. The main problem is that most will develope a load in the summer time when the temps are warm and then shoot all summer, this is great and what you should do, only problem is that when hunting conditions show up with cooler temps, the rifle should really be tweaked to those conditions.

Best time for load development in my opinion are spring and fall when temps will be similiar to what you will be seeing in hunting season. This is of course for a big game rifle.

For long range varmint rifles, I recommend developing loads in the heat of the summer if that is when you will be using them to make sure they will be safe in all temps.

Simply put, welcome to the game, unless your seeing several feet of drop difference, you are not seeing anything unusual even with Retumbo.

Kirby Allen(50)
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Old 12-11-2006, 09:49 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

I shooting a load 2" high at 100 yard with my RUM. I shot a deer with it on November 19. Now the same rifle is about 10" low inside 100 yards.

Similar results with Lapua. That seems a little odd.
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Old 12-11-2006, 10:49 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

A 12" drop? That's not your powder.
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Old 12-11-2006, 11:20 AM
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Re: Retumbo in cold weather? My rifles suddenly started shooting Low.

On 2 different guns?
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