Home Forums Reloading Big Game Rifles Just how Temp Sensitive is IMR 4350

my Roberts really likes this powder under the 100TTSX from say 10 to 80 degrees does anyone know if there will there be a difference in POI?

I`ve never noticed any difference in the cartridges I use it in, I have never really checked the POI at long range (250+yd) where any velocity difference would start show though

I`ve never noticed any difference in the cartridges I use it in, I have never really checked the POI at long range (250+yd) where any velocity difference would start show though

I noted a 155 f/s drop in velocity. The cartridge was 7.5x55 Swiss . The load was 52gr imr4350 and 165gr Hornady BTSP,2650 f/s 80*F to 2495 f/s 30*F. The poi dropped about 1.5" at 100 yds. The primers were Wlr.

that is pretty huge. I think I am going to load shells with 44.5 grains (preferred load), 43, 42 and 41 grains and see how much off they are. If its a big difference then I will go back to Hodgdon 4350.

If my rifle likes H4350, I don't load the IMR version. I've also found that several of my rifles prefer the AA variety. According to Hodgdon's own data, AA appears to be as temp/press stable as their own version. A sample of one ain't much help though.............

My 257 AI loves IMR-4350 w/ a 100 gr Interlock. I've tested for velocity in the mid-teens as well as in the mid-90s and found about a 100 fps loss in velocity, but don't know what this does to POI, which is what I'd be concerned about.

The load shot very tight groups in both temps, so changes were not sufficient to mess w/ harmonics.

Prettay....prettay....prettay sensitive.

Scott is that you? anyway I will just shoot H4350 it shoots almost as well...I have two pounds of IMR4350 that will just sit there...

I couldn't resist a little Curb Your Enthusiasm humor. Actually, I just loaded the last of my IMR4350. I was all settled on just using H4350 but now this new Hybrid 100V has me intrigued. More velocity with less pressure sure does sound good. Right now I'm focused on trying to figure out what loads my 338 Federal likes. Not having a lot of luck with Hornadys. You would think I'd learn my lesson with SSTs after my 257 and 308 wouldn't group with them. I just ordered some 185 TTSX for it so I may be coming over to the dark side. It's also water jug season so I hope to do some 338 bullet testing this weekend.

SFD-

I've had really good luck w/ SSTs in my rifles and heard good things about them elsewhere as well, so don't give up on 'em yet.

Of course if you have some 338 cal 200s you'd like to trade away shoot me a PM... I have some 180 gr NABs I'd trade away if you'd like?

I test loads in the 90s and hunt in the single digits and below and don't consider that an issue w/ IMR-4350. I've been using it a long, long time and intend to continue. If I could go back and rework all the data I have I'd start w/ H-4350, though.

Nice Larry David reference!

Scott water jugs are just sooo outdated...

Which load will more cleanly take a can of two year old chili salvaged from the camper?? a 308 cal 130TTSX or 257 Cal 100TTSX?







Problem....both vaporized the cans could not find anything but a label from one of them, second problem my target stand now smells like chili and had beans all over it...left the cardboard in the storage shed..

I can safely say that IMR4350 and the 25 cal TTSX must expand a bit on impact....same same for the 130TTSX over 47 grains of TAC...the chili never new what hit it...sad in a way...

I didn't think chili season opened until June 15th. POACHER!

Those bullets WAY over penetrated..

self defense! Last time I ate real old chili it gave me a very bad time.

Chili is known to have explosive properties. Not the best choice for bullet expansion experiments.

I'm an expert.

A better alternative would be to use something inert such as a can of peas.


fish head

With IMR4350 you can expect on average between 100-150fps variation in velocity when going from warm temps in the 70's+ to below freezing. A good alternative would be H4350 if your rifle likes the powder or give RL17 a try in the Roberts, both are not as temp sensitive and have given me good results in the Roberts.

And, in regard to the olfactory system


Way Overpenetrate..