IMR 4350 bested H4350 in 6.5 Creedmore today.

[Lennyjoe]

At least in my experience today. Took out a relatively new (60 rounds of factory ammo thru it) Savage Axis II in 6.5 Creedmore today and ran a couple of different powders with Hornady SST 140’s in Starline brass. Heard H4350 was the cats meow in the Creedmore so I started there with loads up to max. Also decided to try IMR 4350 because I have plenty and use it in my .243 and -06 so why not give it a go.

Needless to say, I had best results with 42 gr of IMR 4350 than any other load, H4350 included. Had a 3 shot cloverleaf at 100 yds with a 12 mph SW wind this morning Using the 42 gr IMR load. our rifle range faces due East.

Think I’m gonna stick with that for now since deer season is rapidly approaching and I’d like to try the 6.5 Creedmore round this year.

 

[Charlie98]

I haven't seen any IMR4350 to try... I've got some H4350 right now.

Just be aware... IMR is likely more temperature sensitive than H... H4350 is one of their Extreme powders.

 

[Walkalong]

Had a 3 shot cloverleaf at 100 yds with a 12 mph SW wind this morning

I wouldn't read too much into that.

 

[Lennyjoe]

Just be aware... IMR is likely more temperature sensitive than H... H4350 is one of their Extreme powders.

I’ve used IMR 4350 for years in my -06. From warm winters in Arizona to blistering cold in WV and it’s performed great for me.

 

[Show Me]

I wouldn't read too much into that.

Have a mini thirty that will do that. Once a year

 

[Lennyjoe]

I wouldn't read too much into that.

You haven’t seen me shoot rifle….lol

Much better with pistol, that’s for sure.

 

[243winxb]

Savage Axis II in 6.5 Creedmore

IMR 4350- 41.0 grs. 140 gr Barnes Match Burner. BR 2. Hornady brass.COL 2.780" Redding fl S bushing die. .288" bushing. 30 shot average 1.081" 100 yards. 6 groups of 5 shots. Used wind flags. Scope on 18 power.

Have tried Starline brass. Turned neck. With & without expander.

Hormady factory ammo did worse. Cant turn a hunting gun in to a custom benchrest riifle.

It is what it is.
Edit-
https://apps.dtic.mil/docs/citations/ADA572333. Extreme powder, less important when there is a 10% variation from lot to lot.

 

[horsemen61]

It happens from time to time I have a savage Model 10 that Prefers IMR 4064 ALL the time extensive testing has proven that theory i’m glad you found a Load that you find satisfaction in best of Luck on your upcoming hunt!

 

[.45Coltguy]

Can't recall any issues with IMR powders in either overly warm or cold as heck temps. RL#22 however, well.......

 

[JDeere]

I have about 6 cans of the IMR4350 that a friend gave me. I run it in the 6.5x284 and the 243. Consistent and accurate...

 

[Random 8]

Just put 70 140 BTHPs through an M96 Swedish Mauser stoked with IMR 4350. Two 35 shot matches were fired back to back. If you've ever fired an extended string with an M96, you'll know that long barrel and big Mauser action never really cool down. Temp varied from 45F ambient to "God Knows" with a round chambered in a hot gun for awhile finding the wobble in offhand. If temp sensitivity were more than a hyped and over-rated marketing ploy, we'd know it. Maybe if you're measuring thousandths on a BR course, but not so much in the real world. I took first with a Gold cut score, and the guy borrowing my rifle took second a few points behind.

Shoot your IMR 4350and be happy. BTW, Recobs has it in stock presently.

 

[Chuck R.]

Can't recall any issues with IMR powders in either overly warm or cold as heck temps. RL#22 however, well.......

I had a great .270Win load for 130BTs at 3130 FPS with IMR4831 that would literally lock the bolt up when the temps hit the 90s. No change whatsoever other than the temp.

I now load H4831SC at higher MVs without an issue.

The temperature sensitivity of various powders has been tested, there's numerous articles stating results. Anybody with a chronograph can easily test their loads for themselves.

The impact or effect "depends". IF you're not close to max, you probably won't see any effect like I have. IF you're not shooting at extended ranges, then the delta in MV probably won't have a great effect on your POI. Doesn't mean that it's not happening, just means the effects don't matter to you.

Here's just one decent article:

Powder Temp Stability: Hodgdon Extreme vs. IMR Enduron

The goal of this field test was to quantify the temperature stability of the popular Hodgdon H4350 a...

precisionrifleblog.com

 

[AJC1]

I had a great .270Win load for 130BTs at 3130 FPS with IMR4831 that would literally lock the bolt up when the temps hit the 90s. No change whatsoever other than the temp.

I now load H4831SC at higher MVs without an issue.

The temperature sensitivity of various powders has been tested, there's numerous articles stating results. Anybody with a chronograph can easily test their loads for themselves.

The impact or effect "depends". IF you're not close to max, you probably won't see any effect like I have. IF you're not shooting at extended ranges, then the delta in MV probably won't have a great effect on your POI. Doesn't mean that it's not happening, just means the effects don't matter to you.

Here's just one decent article:

Powder Temp Stability: Hodgdon Extreme vs. IMR Enduron

The goal of this field test was to quantify the temperature stability of the popular Hodgdon H4350 a...

precisionrifleblog.com

Let's agree that the people most effect are running in the high node mostly over book max because they think the risk is worth it. Same crowd shooting 90 grain vlds in 223 with lapua brass that is scrap in 3 loadings or less. Most meet getters don't load that way but I'm sure some do.

 

[Chuck R.]

Let's agree that the people most effect are running in the high node mostly over book max because they think the risk is worth it. Same crowd shooting 90 grain vlds in 223 with lapua brass that is scrap in 3 loadings or less. Most meet getters don't load that way but I'm sure some do.

Like I said before, the effect is there, how much it matters depends on the individuals loading and task/purpose.

For instance, if I was a LR tgt/match guy, why would I want to screw around with a powder that's temp sensitive, when I can buy something that's more stable?

Honestly, with all the other variables that go into it, I don't loose sleep about "being over book max". Dan Newbury's calculations for his OCW method will take you over "book max" every time, that's just how the calculations go.

Continue adding the chosen graduation until you have moved ONE increment above your chosen maximum powder charge.

OCW reloading instructions

OCW reloading overview and instructions

www.ocwreloading.com

Another decent article, and this one is geared towards "meat getters":

https://www.handloadermagazine.com/rifle-powder-temperature-sensitivity

As an example, let’s use a typical .270 Winchester with a 150-grain spitzer at 2,900 fps, a common hunting handload in western Montana. When sighted in 2 inches high at 100 yards, the bullet lands about 6 inches low at 300 yards in typical fall hunting temperatures of 30 to 50 degrees. If muzzle velocity drops 100 fps at zero degrees, at 400 yards the bullet only lands about an inch lower, making no practical difference on a deer or elk.

However, that assumes there is no difference in point of impact (POI) at 100 yards. I soon discovered the 100-yard POI sometimes changed significantly in real cold conditions, and not just up and down, but sideways. Muzzle velocity also sometimes dropped closer to 200 fps.