25-06 and IMR 4350

[Outwest]

I load my 25-06 with 115 B. Tips over 51 grains of IMR 4350. They shoot 1/2 inch groups at 100 yards with no signs of pressure.
This load was developed at temps of 50 to 60 degrees.
I am going to be Antelope hunting this August and the temps could be 100 degrees or more. Does anyone think that the high temps will result in over pressure with this load?

 

[AckleymanII]

I would go on a mad dog hunt for some H4350, problem solved.

 

[BigBolt]

Temperature has minimal effect on pressure altitude and temperature does. Here is a good article.

How Air Temperature Changes Bullet Trajectory — Ron Spomer Outdoors

Air temperature changes bullet trajectory by increasing or decreasing the density of molecules bullets must plow through. Cold sinks, heat rises.

www.ronspomeroutdoors.com

 

[Kracken McGraw]

I doubt it. I would keep them off the dashboard and the other usual hot places.

 

[K22]

The only time I experienced a serious pressure surge was with ball powders, namely H380, in a 22 250, in high temperature field conditions, i.e., over 90 degrees.

However, as Kracken McGraw stated, don't expose the cartridges to direct sunlight or in an exposed locations like a dashboard. This is a good practice no matter which powder one uses.

Also, if your hunt is in August, try a few rounds locally in hotter weather, if possible, before you leave for your trip.

 

[Bill Norris]

A good test would be to heat the ammo up and give it a try before you go on the hunt.

 

[SeabeeKen]

I load my 25-06 with 115 B. Tips over 51 grains of IMR 4350. They shoot 1/2 inch groups at 100 yards with no signs of pressure.
This load was developed at temps of 50 to 60 degrees.
I am going to be Antelope hunting this August and the temps could be 100 degrees or more. Does anyone think that the high temps will result in over pressure with this load?

You are 2 gr over nosler #8 manual listed max for that bullet. Also, stiff bolt and ejector marks are over pressure by about 10,000 psi or more

 

[Outwest]

Is 2 grains over book max considered dangerous even with no pressure signs?

 

[Kracken McGraw]

Is 2 grains over book max considered dangerous even with no pressure signs?

Some book maxes are notorious low too, you just have to feel the pressure signs on your own setup. I noticed on the Hodgdon reloading data for a bullet weight close to yours that it was a grain more for max, whatever that’s worth.

 

[Adam in WI]

The book is a guideline, not gospel. I've had rifles take several grains over max without any signs. I've also had rifles give signs before reaching "book max". The number of variables is too great to point to any one source and use their data as 100% trustworthy. That's why you're told to work up to maximums. Combine hypothetical factors like your brass having greater capacity or your rifle having a longer throat, and you've got a recipe for a rifle that will likely underperform if you adhere rigidly to published data. This hypothetical combo will likely have lower than published velocity at a given charge weight. It would also likely tolerate higher charges before running into any pressure signs and yield higher velocities. Of course, this all Jen Psaki's back to "start low, and work up".

 

[leakeyjohn]

The book is a guideline, not gospel. I've had rifles take several grains over max without any signs. I've also had rifles give signs before reaching "book max". The number of variables is too great to point to any one source and use their data as 100% trustworthy. That's why you're told to work up to maximums. Combine hypothetical factors like your brass having greater capacity or your rifle having a longer throat, and you've got a recipe for a rifle that will likely underperform if you adhere rigidly to published data. This hypothetical combo will likely have lower than published velocity at a given charge weight. It would also likely tolerate higher charges before running into any pressure signs and yield higher velocities. Of course, this all Jen Psaki's back to "start low, and work up".

That is the reason the realoading manuals start low and work up and many are different

 

[sandwarrior]

I load my 25-06 with 115 B. Tips over 51 grains of IMR 4350. They shoot 1/2 inch groups at 100 yards with no signs of pressure.
This load was developed at temps of 50 to 60 degrees.
I am going to be Antelope hunting this August and the temps could be 100 degrees or more. Does anyone think that the high temps will result in over pressure with this load?

It won't affect the first couple of shots. After your barrel heats up...then won't cool down because it's hot outside...It may affect load pressures.
The best thing to do is shoot a 20 shot string and get the barrel good and warm. Then let the last five rounds 'heat soak' in the chamber and look for pressure signs and your last five cases.
added: for heat soaking, you only need to leave a cartridge in the chamber 15 seconds. If no pressure signs then 20 seconds.

 

[Rube Shooter]

I load my 25-06 with 115 B. Tips over 51 grains of IMR 4350. They shoot 1/2 inch groups at 100 yards with no signs of pressure.
This load was developed at temps of 50 to 60 degrees.
I am going to be Antelope hunting this August and the temps could be 100 degrees or more. Does anyone think that the high temps will result in over pressure with this load?

I have used IMR 4350 and 115 Nosler Btips for several years, both hot and cold temperatures.
My loads were 48.6 gr and 48.8gr and both were accurate enough to put meat on the table.

These 2 loads were developed and tested in warm Texas weather, if there is such a thing, 90+ degrees and I did not have any issues with excessive pressure that I was aware of, extractor marks, sticky bolt etc.

All groups I shot were 1"-3/4".

 

[Janson]

You are 2 gr over nosler #8 manual listed max for that bullet. Also, stiff bolt and ejector marks are over pressure by about 10,000 psi or more

 

[Janson]

Is 2 grains over book max considered dangerous even with no pressure signs?

Some book maxes are notorious low too, you just have to feel the pressure signs on your own setup. I noticed on the Hodgdon reloading data for a bullet weight close to yours that it was a grain more for max, whatever that’s worth.

I was wondering about using hornady book for loading my 25-06 myself