IMR vs H-4350

[charles p]

Just loaded some 280 Rem with 140 gr bullets.  Used a manual that specified H-4350.  After I finished loading 55 grains of IMR-4350 I realized I had not used the correct powder. 
 
Do I have a pressure problem.  Made a similar mistake with IMR-4831 many years ago and saw pressure problems when using Hogden weights.

[JustaShooter]

According to http://data.hodgdon.com/cartridge_load.asp, for 140gr Nosler Partition using H4350 start is 50gr and max is 53.5 so you are already over max using H4350. 

Lyman 48th lists 139gr JSP using IMR 4350 start 48.5 max 54.0

Hornady 7th edition lists their 139gr bullets using IMR 4350 start 43.0gr max 53.7gr (and H4350 start 42.9 max 52.7)

So, according to all 3 of these references I think you are well over max using H4350 or IMR 54350 either one.

What manual are you using that lists a safe load for H4350 at 55gr?

[charles p]

Their website.  Have a notebook of loads printed from various manufacturer's websites.  Will consult several loading manuals now that you have got me thinking.  Never  had best accuracy results from hot loads.  The page I referenced said 55.5 gr was upper limit.  Lots of 280 data used to be very mild.
 
Rifle is a M700, not a semi. 

[JustaShooter]

I'd check their website again, here is what I show for the 280 Rem:

Cartridge:     280 Remington
Load Type:     Rifle
   Starting Loads
   Maximum Loads
   
Bullet Weight (Gr.)    Manufacturer    Powder    Bullet Diam.    C.O.L.    Grs.    Vel. (ft/s)    Pressure    Grs.    Vel. (ft/s)    Pressure         
140 GR. NOS PART     Hodgdon     Suprform     .284"     3.230"     54.0     2905     55,400 PSI     57.0     2983     58,600 PSI          
140 GR. NOS PART     Hodgdon     H4831     .284"     3.230"     54.0     2732     41,000 CUP     58.5     2927     48,500 CUP          
140 GR. NOS PART     Hodgdon     Hybrid 100V     .284"     3.230"     50.0     2669     41,300 CUP     54.0C     2847     47,000 CUP          
140 GR. NOS PART     Hodgdon     H4350     .284"     3.230"     50.0     2756     41,900 CUP     53.5     2918     48,500 CUP          
140 GR. NOS PART     Hodgdon     H414     .284"     3.230"     47.0     2710     41,800 CUP     51.0     2867     47,900 CUP          
140 GR. NOS PART     Winchester     760     .284"     3.230"     47.0     2710     41,800 CUP     51.0     2867     47,900 CUP          
140 GR. NOS PART     Hodgdon     Varget     .284"     3.230"     42.0     2674     41,400 CUP     45.5     2838     48,100 CUP          
140 GR. NOS PART     Hodgdon     H4895     .284"     3.230"     42.0     2711     43,200 CUP     45.2     2830     48,400 CUP           

It's always possible they've changed the data due to changes in the latest lots of powder, etc.  That's why I always recommend checking current published data, whether updated website data or new editions of the manuals.

[Lloyd Smale]

I wouldnt be to conserned. Unless you have an odd ball gun those loads should be fine. 280 ammo like was said is notoriously underloaded. Mostly because it was back in the day mostly shot in remington pumps and autoloaders that didnt have great ammounts of camming action for extraction. No reason at all it cant be loaded to the same pressures as a 270 in a bolt gun.

[mjbgalt]

work up to whatever is safe in your gun. if you are not an expert reloader with tons of experience i'd just stick to the manual recommendations. in my case though i shot 6.5x55 and the pressures were very low since there are old mausers out there that can't take the pressure. however if i put it into a remington 700 there's no reason i can't load that brass case to the same levels as other similarly sized cartridges in the same gun.

not trying to preach, just that i know GB does not want us recommending above listed max loads on his site, i suppose for liability reasons.

however if this was my gun i  would pull the bullets and work up a load inside the recommendations since i am not familiar with the .280 and its quirks.

good luck and good loading

[wncchester]

Assuming any max book load is safe in any rifle and being careless with components are both excellant ways to get hurt.

[nodlenor]

I would set the loaded ammo aside and load some others starting at a lower ammount and work up until I found pressure signs or until I reached the load already used. Might save you from having to pull a bunch unnessarily. I'm not recomending loading HOT loads just trying to maybe save you some time and work.

[Larry L]

would set the loaded ammo aside and load some others starting at a lower ammount and work up until I found pressure signs or until I reached the load already used.

This would be what I would do. Looking back at IMR 4350 data for that round, I show in the Speer manual #10 that for a 145gr bullet a max load of 55.5 grs IMR4350. So what you have is close to the max limits. Close enough I'd suggest the above- load others and work up to this load. Considering not all guns are alike, yours may run a max or even over max load out it with zero signs of pressure. But the other side of the coin, it can also show danger signs and never get to max published loads. Best work up to them.

[gr8ful]

would set the loaded ammo aside and load some others starting at a lower ammount and work up until I found pressure signs or until I reached the load already used.

This would be what I would do. Looking back at IMR 4350 data for that round, I show in the Speer manual #10 that for a 145gr bullet a max load of 55.5 grs IMR4350. So what you have is close to the max limits. Close enough I'd suggest the above- load others and work up to this load. Considering not all guns are alike, yours may run a max or even over max load out it with zero signs of pressure. But the other side of the coin, it can also show danger signs and never get to max published loads. Best work up to them.

+1 for both of the above posters.  Good advice there. 

[Doug B.]

The fact that you even questioned it would be enough reason for me to pull them if I were in your shoes. I ALWAYS start low to mid range, depending on rifle, and work up.


Just my $.02 worth.

[1sourdough]

 I'd proceed with caution. I recently pulled some reloads I was given that were over max in about all of my current manuals. I also don't understand why many feel they need to bump against max to kill a deer or shoot a target?


  A few years ago I went on a bear hunt with milder 300 wsm loads. The 180 grn Partition still exited the bear.

[Lloyd Smale]

guess i look at it a bit differnt. If i want reduced 300wsm ballistics ill take out an o6. When i want a magnum i want a magnum. Not that i load them way over book loads but your sure not going to mistake a 300 mag for an 06 when you pull the trigger. Cant see hauling around a downloaded 9lb gun or paying twice as much for brass for a mag rifle then loading it down to a standard rifles ballistics.