Ramshot Magnum?

[Mike Matteson]

On the Internet they are both considered terrible. . The only thing I have seen is one of the guys in our circle had a rl26 load over pressure in cold temp. Below zero. Personally I think too much is made of temp sensitivity. I try not to develop in cold temps to the ragged edge and then take that load out when it is 90*. When we load develop in the cold I try to keep the ammo room temp or body temp right up to the point of firing the shot.

I'm just like everyone. I too will start to doubt my powder choice and then switch to a powder with a better reputation even though I give up performance.

I feel that you have it backwards. Temp Sensitive powder work the other way. The hot the temp the higher the pressure. The colder the temp the lower the pressure. Some powder can change almost 1fps for 1 degree.
I had a load deverlop that was hot to start with. Weather changed from winter in S. Calf to Summer. The temp change below a primer out of the cartridge. The temp change about 60 degrees.

 

[Rosebud]

I know where to get Magpro. But no magnum.

 

[Rosebud]

I feel that you have it backwards. Temp Sensitive powder work the other way. The hot the temp the higher the pressure. The colder the temp the lower the pressure. Some powder can change almost 1fps for 1 degree.
I had a load deverlop that was hot to start with. Weather changed from winter in S. Calf to Summer. The temp change below a primer out of the cartridge. The temp change about 60 degrees.

You might have mis read that.

 

[ADLEE2]

I feel that you have it backwards. Temp Sensitive powder work the other way. The hot the temp the higher the pressure. The colder the temp the lower the pressure. Some powder can change almost 1fps for 1 degree.
I had a load deverlop that was hot to start with. Weather changed from winter in S. Calf to Summer. The temp change below a primer out of the cartridge. The temp change about 60 degrees.

Both cold and heat can increase pressures. I don't have to worry about extreme cold in my neck of the woods, but after April, heat is guaranteed.

 

[esorensen]

I have found SIGNIFICANT pressures as well in sub zero temps with RL26 in 6 and 6.5 CM.

 

[RockyMtnMT]

I feel that you have it backwards. Temp Sensitive powder work the other way. The hot the temp the higher the pressure. The colder the temp the lower the pressure. Some powder can change almost 1fps for 1 degree.
I had a load deverlop that was hot to start with. Weather changed from winter in S. Calf to Summer. The temp change below a primer out of the cartridge. The temp change about 60 degrees.

I don't have it backwards. You are correct with most powders. The colder the slower. There are other reports of the double based powders spiking at low temperatures. I have yet to see trouble with rl26 in high temperatures.

 

[bigschmar]

I've really liked it in my sako finnbear in 264 win mag with a 140gr sierra gameking. Found load data on loaddata.com. tested on an almost 80 degree day. 3250 fps with sub 1 moa.

I'll chrono it again in a couple weeks in much cooler temps and see what it does then for fps.

I've found the recoil to be not too bad at all with this load but it sure is loud!

 

[skinny pedal]

im running 90grains of H1000 with 270 grain VLD-X in my 338 rum. they shoot really well and im getting about 2800 fps with a 26 inch tube. i do have a few pounds of magnum but have not tried it yet so i will be curious as to what your results are.

 

[Mike Matteson]

I don't have it backwards. You are correct with most powders. The colder the slower. There are other reports of the double based powders spiking at low temperatures. I have yet to see trouble with rl26 in high temperatures.

I haven't seen that, but will keep it in mind. There only 2 powders I use in rifles. That my 220 Swift, and my 338 WM. The swift load was develop in hot weather and never over reloading manuals spec. The 338 WM is 5.5 grs over manual spec's. develop in hot weather. I haven't checked the velocity in colder weather yet. Hopefully I will get that done this winter. Late responce, I didn't see until now.