Home Forums Reloading Varmint Rifles H 335 Temp sensitivity

MD and others,

after going back to look at my post. I see where I made a mistake. I knew Hornady does not make powder but I used the word Hornady instead of Hodgdon. Guess I am going to have to start proof reading my post lol.

I guess I am going to have to start investigating whether a powder is Extreme or not before reloading. Some posted above that they only load in summer but I know there are some reloaders who load in the winter time. I will have to save the Extreme powders for summer to ensure that they will work in the winter time. As I do not want any surprise if I use same load for say H335 in the winter time in the summer time.

Valad, 335 is a good powder for 223 albeit it is very dirty and unpredictable when using Max loads on very warm days. I generally as a rule of thumb I leave it alone during the summer when range temps get to the 85-100 range.
Also I don't work at max on any of my loads, its usually .5 - 1 grain under. 335 and Benchmark usually give me 3350 - 3400 out of a 24" barrel @ 1 under with a 52 SMK which gives a little head room. There is a post on here where I gave velocity avg. from 2 223's with Benchmark, and they are typical of what I have always gotten with that load.
I have also had some interesting gains in velocity from Benchmark on very hot days and it is an extreme powder, albeit the interesting has not been in the same category as 335.

Aberdeen proving grounds "proof round is a standard round heated to 140degrees F. Human sense of touch is a burning sensation at 150 F and above. At 140 degrees you can hold a hot object, at 150 F you cannot. Whenever i have had preesure issues with any powder, i was already expecting it.

I have used H335 for many years and have never experience any problem from heat to cold with it. One of the most accurate powders in the 223 Rem.

Bea175, my experience is similar to yours , have shot lots of h335. In the early 1970 my understanding was much military 5.56 was loaded with h335 according to a commercial reloader i did business with. Due to the its clean burning characteristics. For what it is worth