26grs of 748 with a 55gr bullet is usually very good out of just about any 223. 24.7 gr with the 64 gr Winchester Power Point is also usually very accurate.

 

Only thing I have heard about 748 is it gets great velocities but is very temp sensitive

 

the 300aac/blackout is based on the 221 fireball case.( SHORT 223case) 748 is great in the 223 but waaaay to slow for the 300 aac

 

IMR-4227 works very well in .221 fireball, it might be a good choice in the .300 blackout since the are basically the same case size

748 does work very well in the .223 / 5.56

 

W748 works very well for the .223 Rem. I still was it for 64gr sp it is very consistent even when the temp is 100deg. or 0 deg.
get the down load from Sirrea bullet web sight for 300 AAC load data

 

The other great thing about 748 is that it meters so well, like all the ball powders do. I have weighed hundreds of charges of 748 after they were thrown and there is virtually no difference from charge to charge. I only weigh the first charge and random checks now that I know for certain the throw will be exact.

 

It is my go to powder in a 350 rem mag and a 358 win using 200 grain powder. Just about all 223 target shooters I have witnessed at the range were loading WW 748. In talking with Mr. Hodgdon by phone he said that they did all of their 223 testing at his powder plant using H-335.

 

AR or bolt action? I use Varget in my AR with a 60gr nosler with great results

 

A great powder, meters very well through the measure. As Dirty Harry may have stated about any powder. "A powder needs to know it's limitations'.

AC

 

Be careful about the loading the Whisper/BO. It is fine for what it is for. 123's aren't going to safely reach varmint level speeds.

The .35 Remington and .223 have similar tastes in powder and 748 works decently in both.

 

Let's deal with this "temp sensitive" nonsense first.
MOST of the problems that get a powder blamed for being sensitive, is from being in the chamber prior to firing. Heat soak happens quickly and is a bugger.
A powder is ONLY insensitive if used in a set of circumstances designed for. Dr. Bramwell has done plenty of good science testing this to death.

748 is fantastical in the 223, yes. It was long the choice and record holder for benchrest shooters in the Deuce.

748 came from the same family of powder as H335/Bl-c(2); yes those are the same in none canister grade, only differ on the as-built end. 748 has the addition of some tin/bismuth compounds, which Hodgdon markets as the miracle inside of CFE for cleaning copper.
CFE223 in bulk grade has been around for well over a decade. Not created by Hodgy, not created for the U.S. military. It was the French around 1900 that discovered it.

Winchester hasn't produced any components in a very long time. Hodgdon sells their name brand for them, but doesn't produce any powder either. The data looks the same to you because it is. It's part of their marketing agreement.

 

I use 748 for 64 and 70 gr .223 loads.

 

Well I guess results I have gotten with certain powders @ different outside ambient temperatures are completely wrong

 

The results aren't wrong, but what is really happening Vs. What you interpreted probably is.

H335 Vs. Varget in the 223 with 55gr bullets showed that varget was FAR more temp sensitive; as an example.
Looking at Hodgdon's own data for temp stability, many of the "improvements" aren't statistically different anyway.

Anyone interested in this, I encourage you to read the tests done by Denton for yourself. Some were published in the note defunct VHA magazines, but since can be found on RSI's website. They are the Pressure Trace people, if someone wants a way to actually measure pressures on their rifle.