Seabeeken
Well-Known Member
The accuracy load listed in you screen shot is H4350. I'd go with that. I sure miss H-450, my 270 loved that stuff.
-
If you are being asked to change your password, and unsure how to do it, follow these instructions. Click here
IMR 4831 VS H4831SC
- Thread starter Thompsonj
- Start date
Help Support Long Range Hunting Forum
Thompsonj
Well-Known Member
Stammster
Well-Known Member
All those charges seem a little light to achieve the stated velocities (by up to 2 grains). I suspect Sierra used a long barrel, or a case with a lower H20 capacity.
Or the powder they used was hotter than average. I've also read the new H4831 is a little slower than the original surplus - which might explain it also. However even the H4350 seems off by a few grains.
On the other end, the Hornady #8 manual lists 62gr as the max for their 130gr bullet - which is very similar to the Sierra. I think it is little aggressive, and the Sierra conservative.
As I said before, I believe the factory ammo you are trying to duplicate used a 4350 class powder.
Although everyone says H4831 is the go to powder for 270 Win, in the 130 class bullet I've found H4350 slightly more accurate with similar velocities.
Or the powder they used was hotter than average. I've also read the new H4831 is a little slower than the original surplus - which might explain it also. However even the H4350 seems off by a few grains.
On the other end, the Hornady #8 manual lists 62gr as the max for their 130gr bullet - which is very similar to the Sierra. I think it is little aggressive, and the Sierra conservative.
As I said before, I believe the factory ammo you are trying to duplicate used a 4350 class powder.
Although everyone says H4831 is the go to powder for 270 Win, in the 130 class bullet I've found H4350 slightly more accurate with similar velocities.
Ok, I'll check some of the earlier Sierra manuals and see what they say.
Mike Matteson
Well-Known Member
IMR powder in 4350 and 4831. They are temperature sensitive.
Ok, the Sierra manuals #`1 #2 show H-4831 59.5grs at 3100 fps for a 130grs bullet. I've used this load over the years in my .270's M70 rifles which I've owned with a 24" and 26" barrel and had no problem hitting 3000 plus fps with that weight bullet. Remember these were my rifles, start low and work up slowly, keep checking brass and primers in your rifle. Good luck, Cheers.
thomasbangs
Well-Known Member
Too light a load to get 3000 fps with that combo. I get 3111 fps with H4831 behind the 130 gr. Hornady Interlock in my pre 64 Winchester Model 70 with a 24" barrel. I get 3154 fps with 55.5 grs. of IMR 4350 behind the same bullet with same gun, both are loaded with WLR primers. Both of these loads are accurate. I should add that these are with Winchester brass.
Shooting 130 gr Barnes bullets at 60 degrees Fahrenheit out of my 22" factory .270 win I get around 3050fps using IMR 4831.
I recently switched to H4831sc because it is supposed to be more temperature stabile. Using same bullet, same temperature, my velocity is around 2975fps.
I recently switched to H4831sc because it is supposed to be more temperature stabile. Using same bullet, same temperature, my velocity is around 2975fps.
Howdy. Just a note. I have been loading 60 grains of h4831 in my m70 270 for years , no problems no broken case,s or blower primers ever.. my not be the best load for all rifles, I also load 57gr 4831 with Speer 150 grain. Have been for more than 30 years. Don't use my data.. just a coment on what works well of me..
What was your load for that ? I just inherited a 264 win mag
Any info would be great
Mike Matteson
Well-Known Member
Here is the temp sensitive chart. 1 chart shows Extreme powder, and the other explains it in more detail.
With a Sierra 140sbt it was 61.3 imr4831. Which was more that was listed in the #5 manual. I've reloaded the same Win super x brass 20 times. Still no sign of OP.
