Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Berger Bullets


Retumbo - Powder temp V's velocity

LinkBack Thread Tools Display Modes
Old 12-15-2011, 01:55 AM
Platinum Member
Join Date: Nov 2008
Posts: 1,082
Retumbo - Powder temp V's velocity

Has anyone got any data on the effect temperature has on Retumbo powder with regards to muzzle velocity?

My chronograph is a bit unreliable so I am looking for some help.

Just want to get a feel for how sensitive this powder is to changes in temperature and to what effect. Faster, slower, magnitude?

Also any info on H1000 would be great as well.

Reply With Quote
Old 12-15-2011, 07:26 AM
Platinum Member
Join Date: Jan 2008
Location: Northeast
Posts: 2,563
Re: Retumbo - Powder temp V's velocity

I have done some work with my 6.5x284 loaded with 140vld's and 59 gr of Retumbo. My Chrono tests seem to indicate a 15-25 fps velocity difference from 25F to 80F. I am not completely confident of chrono data especially when testing on a 25F day and comparing to data aquired back when it was 80F. But, this appears to correlate well when I plug my baseline data into my ballistic program and do some actual field testing at extended ranges at the actual temperatures. Bottom line is that I get pretty close when I plug temperature changes into my ballistic program. Just my experience.

"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt
Reply With Quote
Old 12-15-2011, 09:17 AM
Silver Member
Join Date: Jan 2011
Location: Colorado
Posts: 145
Re: Retumbo - Powder temp V's velocity

Hogden claims that any powder with extreme on it won't be effected by temp. Both those powders are labeled as extreme. I have not tested this but I've seen guys online test it by using a cooler to freeze some rounds on a hot day and their test showed no difference. It was the guy from long range pursuit tv show.
Reply With Quote
Old 12-15-2011, 03:07 PM
Silver Member
Join Date: Jun 2010
Posts: 467
Re: Retumbo - Powder temp V's velocity

Go to longrangepursuit.com and in there tech or do it yourself section there is a test of this you can watch. Prettygood stuff.
Reply With Quote
Old 12-15-2011, 03:59 PM
Platinum Member
Join Date: Nov 2008
Posts: 1,082
Re: Retumbo - Powder temp V's velocity

I contacted ADI who make this stuff. This is the reply that I got below, for what it is worth.
I do know that they test in 24 inch barrels so that may have some effect?
My results with my rifle seem to indicate a change of 25 fps so this is within the range that they state but over a smaller temperature range.

It is interesting to see that they start their testing at -0 degrees. Strange things happen at the freezing point of water so a step change at this temperature might also be possible?

Looks like more testing required with my rifles.

************************************************** ***********

Thank you for your enquiry of 7/12/2011 with regard to reloading using ADI Sporting
ADI propellants have a built-in technology which provides superb ballistic thermal
insensitivity. The change in velocity over the temperature range of -0C to 50C is
generally less than 30 fps. Unfortunately, we have no data measured in the particular
firearms you mention: we perform our testing using test barrels in a controlled,
laboratory environment. The components used will also effect the ballistic thermal
Extreme caution should be taken and loads should be worked up accordingly. Refer to
our website at www.adi-powders.com.au or our 5th edition handloaders’ guide for more
information, warnings and reloading safety.
We thank you for using ADI Sporting Powders.
Reply With Quote


Thread Tools
Display Modes

Similar Threads for: Retumbo - Powder temp V's velocity
Thread Thread Starter Forum Replies Last Post
Reloader 17 temp v velocity change Aussie Powder Burner Reloading 14 04-30-2011 08:02 PM
Reloader 17 Temp / velocity change? Aussie Powder Burner Rifles, Bullets, Barrels & Ballistics 0 04-26-2011 12:24 AM
Temp vs Velocity- insights and solutions fatrack Long Range Hunting & Shooting 2 09-19-2010 03:03 PM
Temp sensitivity with Retumbo, 300RUM, 210 Berger... jmden Rifles, Bullets, Barrels & Ballistics 0 10-10-2009 01:08 PM
Temp related velocity loss Jimm Reloading 10 12-09-2005 09:49 PM

All times are GMT -5. The time now is 10:46 PM.

Powered by vBulletin ©2000 - 2015, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC