H4831 vs H4831SC

CTS

CTS

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Going to be loading up some 7mm Rem Mag with a sierra 175gr bullet. For some reason, some data only shows the H4831 as an option while other places only show the Short Cut version as an option. My question is...can i use the same data for the H4831 as the H4831SC? according to the Hodgon website the only difference is the physical shape.


Also the data i am finding is not really all that consistent. The Hodgon site using the H4831 list the min/max load as 55.0 (2532 fps) and 58.0 (2660 fps) respectively. While the sierra loading data using the H4831 SC list the min/max as 57.4 (2800 fps) and 63.3 (2950 fps)

If someone can shed some light on this for me it would be greatly appreciated.

Thanks!!
 
Same powder. Same data. Hodgdon doesn't give SC and not SC data.
Manuals will always be slightly different. They reflect conditions with the specific rifle(that usually isn't a rifle) using the components listed on the day of the test only. Generally best to follow what the manufacturer says, but Lyman actually does testing and is safe data.
 
The two powders are meant to be totally interchangeable. That's Hodgdon's information on it, not just my opinion.

Remember that there can be variations from lot-to-lot in terms of density so if you're using a thrower, the weight it throws can change from one lot to another of the same powder. SC will settle slightly better so you may get a little more powder in the same volume so may need to adjust.

Start low and work up. Use a chrony if you're chasing the highest velocity possible.

There are dozens of different variables that can cause data from two sources to not agree. Any number of dimensional differences in components or the gun itself (nothing has a zero-tolerance; everything has variation) as well as burn rate differences from different lots of powder, same goes for primers. Each component in the equation (primer, brass, powder, bullet, chamber, and barrel) all have a number of variables that can be slightly different and change the pressure/velocity with a given amount of powder. There are also atmospheric considerations to look at (humidity, temperature, pressure, etc.).

Personally, I look at all the data I can find and pick from there. If they are all fairly close, I'll just pick one (usually the Hodgdon data site). Other times I'll take an average of fairly close values.
If they are quite different, I'll usually go with the lowest starting load and carefully approach the highest max load. The best shooting load will be somewhere in between.
 
Thanks!! I am going to start off with 55gr loads. Or more specifically a few at 55, 56, 57, 58 and see how they group then adjust from there. (Unless this is a bad idea)

I will have to get a chrony for sure. Was hoping to get higher fps then what the manuals are saying I will achieve.

Thanks again for the help!!

CTS
 
CTS said:
Thanks!! I am going to start off with 55gr loads. Or more specifically a few at 55, 56, 57, 58 and see how they group then adjust from there. (Unless this is a bad idea)

I will have to get a chrony for sure. Was hoping to get higher fps then what the manuals are saying I will achieve.

Thanks again for the help!!

CTS
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Good plan. I suggest a small test in 0.5 gr increments. Watch for pressure. Your gun is different than the powder company's.
 
CTS While H4831 is a good powder to us in the 7mm Mag I have found I get better results with IMR 7828 powder, especially with heavier bullets (160 gr and up ). You may want to give 7828 a try.
 
rokoro said:
CTS While H4831 is a good powder to us in the 7mm Mag I have found I get better results with IMR 7828 powder, especially with heavier bullets (160 gr and up ). You may want to give 7828 a try.
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Good to know! So hard to choose a powder to start off. Will see how this powder does and then maybe give the 7828 a shot...more time in the reloading room oh darn. haha
 
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