.270 Winchester - H4831 or H4350???

mlehtovaara

mlehtovaara

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The bullets i have on hand for my first loads are 140 grain Hornady Interlocks, and I will likely try 130 and 150 grains as well to find the best results, but not sure which powder to give a try first.

I really don't want to go buy a whole bunch of powders, and have read that both of these are great options, as well as IMR 4350.

Just looking for any recommendations.....

Cheers,
M
 
Be careful using any loads we post here, don't just load up what one of us has posted as it may be too much for your rifle. Always start low and work up.

Use the advice, but confirm safe levels with a manual or two and work up.

Happy loading, Bill
 
Until fairly recently, the .270 is one of the more popular calibers that had never graced or been part of my 'harem'. I corrected that deficiency by purchasing a model 3000 Husqvarna from a gentleman on site.

Husqvarnamodel3000270Win.jpg


At about that time I was also in the market for 'something' in a Mannlicher style. A short while later as bad luck would have it, I purchased a model A III from a friend:( as he was no longer able to use it. It's also in .270, not quite the caliber I was hoping for but the sentimental aspects won over.

SakomodelAIII270Win.jpg


:(Since then my friend passed away. So, now I have a pair of 270s. I haven't yet done any great amount of shooting or reloading for either but from all I've heard, 4831 appears to be the way to go. I went with IMR as I've had really good luck with a number of IMRs powders over the years.
 
I think either would make for a good choice. I would certainly go H4350 over IMR4350, and for the H4831 consider H4831SC, as it meters better.
 
Well I just picked up 3 lbs of H4831 SC. ;)

I have some 140 gr Interlocks I will be loading up as soon as I find some brass.

Most things I am reading suggest the top end loads do better so I am gonna try 57-59 grains and see where I should focus my fine tuning.

Thanks for the help guys. ;)
 
Don't start any higher than the Start load. Work up in 0.5 gr increments. For the first out, 3 of each will give you an idea of accuracy potential and where pressure starts.

I had a huge pressure problem once with a published Start load. A disaster in one rifle, but mild in others. If you don't know this rifle, start low.
 
Stating load on Hogdgon's site is 54 grains, and that seems really low. I have spend all night and all morning reading up on this powder with 140 grain bullets, and haven't even seen any suggestions under 57.5. Most say that max has provided best accuracy.

Max on Hodgdon's site says 58 grains,which seems a little lawyer friendly from all the loads I have read, and I wouldn't start any higher than 57 to be safe, but I guess I could go a little lower. This is also with standard H4831 which is a compressed load, which won't be the case with the SC version.

Personally I have never had much luck with lower end loads, and found in and around max to perform the best in most applications.
 
Some books show 57 grains of 4831SC to be a max load, others 57.5, don't start this high, and DEFINITELY don't start with a full case or compressed load. I wouldn't start any higher than 56, probably a bit less for 140 grain bullets until you get to know the rifle. You might find a max load at 56.5, or maybe at 58.5, who knows. My Parker Hale maxes out at 57.5 grains of 4831SC behind a 140 accubond measured on the chargemaster and a pacific model m scale.

Don't take others findings as they mean nothing to you except as a reference, your rifle and your scale are NOT identical to theirs. Your safety/life and rifle's safety/life depend upon you starting low.


All IMHO of course.
 
My 270 likes H4831 for 130gr and heavier and either H4350 or IMR4350 with 100-110 grainers. My most accurate load is a 110gr V-max over H4350. 100 grain Sierra HPs group best with IMR4350 and make a big mess of anything they make contact with.
 
Alright you guys convinced me. ;)

I will start at 55 and go to 58 in .5 increments for starters.

If I don't see pressure signs I would go to 59, as I am not convinced these max loads weren't written by lawyers. LOL

That said I am not after velocity and more concerned with accuracy so it doesn't hurt to play it safe.

Thanks Again
 
mlehtovaara said:
Alright you guys convinced me. ;)

I will start at 55 and go to 58 in .5 increments for starters.

If I don't see pressure signs I would go to 59, as I am not convinced these max loads weren't written by lawyers. LOL

That said I am not after velocity and more concerned with accuracy so it doesn't hurt to play it safe.

Thanks Again
Click to expand...

Just remember these truths:
  • you'll almost never see any "pressure signs" before you reach 65,000 PSI!
  • you need to raise pressure by 10% (6,000 PSI) to get an extra 5% muzzle velocity (150fps) for a given propellant.

Alex
 
I have a Winchester 22" 270 and H4350 seemed to work well pushing a 140gr interlock. Good enough for hunting, so I didn't feel the need to go get something else to marginally increase accuracy. Right around 53 gr I think off the top of my head.
 
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