Data for 300gr Impala bullets in 375HH?

[Peter Larsson]

Do anyone have any data for 300gr solid impala bullets in 375HH?
Best would be with Norma 203B (RL15)
Peter.

 

[Peter Larsson]

Tested two loads today.
62 gr N203b -690m/s and 64gr-720m/s.
I hope to use them om a buffalo in April.
Should i stop at 64gr or should i go any higher?
I saw that Norma loads their 300gr solids to 777m/s.

 

[PHOENIX PHIL]

I'd say you've got room to increase the charge. The 777m/s velocity that Norma advertises is right there at what many achieve with a 300gr projectile. So I would increase the charge and use the most accurate load between where you are now and the 777m/s velocity.

But of course I would do this slowly monitoring bolt opening, extraction and the spent brass for pressure signs.

 

[Peter Larsson]

I allways take it easy when reloading. A bit coward i guess.
The strange thing is that the data I got from Impala bullets was
60,5 gr Norma 203b (RL15) but Norma list 71,6 gr as Max.
Thank you for your input!

 

[PHOENIX PHIL]

I allways take it easy when reloading. A bit coward i guess.
The strange thing is that the data I got from Impala bullets was
60,5 gr Norma 203b (RL15) but Norma list 71,6 gr as Max.
Thank you for your input!

Discretion is the better part of valor, especially when developing something that could blow your face off if done wrong!

 

[Peter Larsson]

Agree!