IMR 4895 Temperature Sensitivity .270 win


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v8stang289
February 6, 2013, 08:40 PM
I have a pound of IMR 4895 and was thinking about using it to work up a hunting load for my .270 win.

I've heard that IMR 4895 is temperature sensitive in regards to pressures/velocity. Hodgdon shows a 166 fps spread between 0-125 degrees in a 22-250.

I'm more interested in how it would be in a .270 in temperatures from 30-95 degrees.

Most likely I would work up the load during the summer where it could be in the upper 80's to upper 90's, and then when Deer season rolls around temps are usually 30's-70's.

So, any idea whether a load that shoots accurately and is sighted in at 95 degrees will still be ok at 30 degrees?

Anybody have personal experience using IMR 4895 in these temps?

I know there is no substitute for hands on experience, but I'm trying to find out now whether I need to find another powder or whether this is suitable.

Thanks!

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rcmodel
February 6, 2013, 09:03 PM
Load it, Shoot it.

Temperature sensitive is another recent innovative catch-word to sell new powders previously unavailable.

IMR stood for Improved Military Rifle powder when it was invented, concocted, mixed, or whatever is is they do when a new powder coating is formulated.

IMR-4895 fought WWII & Korea in Jungle heat and Arctic cold just fine.


Unless you work up a primer blowing, bolt sticking, too-hot load in August?

The deer you kill with it in November won't notice any difference a tall.

rc

Jim Watson
February 6, 2013, 09:12 PM
The only question I might have is not temperature but suitability.
You will not get top velocity with 4895 in a .270. It would be more at home with 4350 or 4831.
But you might get top accuracy. If that is the powder you have, go shooting.

plodder
February 6, 2013, 09:28 PM
I use 4895 as my "one size fits all" powder in 5.56/.223, 25-06, .270 and 30-06 including Garand loads and in temp extremes exceeding both ends of your 30-95 range reference and I am confident that powder sensitivity to temperature has never been the weak link in the trigger pull to target impact sequence of events.

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