Speer Impact Load Data

[ltmlt]

Hi,

Looking for new loads for my .300 Weatherby with 172gr Speer Impact other than the one supply by Speer, because the only powder I have from their data is with IMR-4831 and I have a lot of IMR-7828SSC and RL-22 and no data that are very good for the .300. Anyone has loads with these powders and the Impact Bullets.

 

[remington jim]

IMR7828SC is a GREAT powder in the 300 WBee - I would start with 80 grains and a CCI250 or FED215 sparker and work up ! jmo RJ

 

[todbartell]

Just use 180gr data and do some development, you'll likely be able to slightly increase the charge weight of powder since the Speer bullet is 172gr

 

[ltmlt]

Exactly what I thought, I know that 80.0gr of IMR7828SSC is the max load for the 180gr, I'm going to try this hoping to achieve a good grouping.
Thanks

 

[remington jim]

Exactly what I thought, I know that 80.0gr of IMR7828SSC is the max load for the 180gr, I'm going to try this hoping to achieve a good grouping.
Thanks

MAYBE IN SOME RIFLES .

I Shot 84.5 grs in My 300 WBee Rem M700 with a 180 gr . Radar showed just over 3200 fps Avg . No pressure Problems . RJ

 

[ltmlt]

MAYBE IN SOME RIFLES .

I Shot 84.5 grs in My 300 WBee Rem M700 with a 180 gr . Radar showed just over 3200 fps Avg . No pressure Problems . RJ

Thanks RJ

 

[remington jim]

Itmlt What rifle brand is your 300 WBee chambered in ? RJ

 

[bearhunter]

OP, I'm assuming you have access to or own a chronograph?

 

[ltmlt]

It's a Remington 700

 

[ltmlt]

Yes I have a Magneto V3

 

[remington jim]

It's a Remington 700

ok Start at 78 Then . RJ

 

[dan belisle]

It's a Remington 700

Jim, is spot on. Don't start at the max load, regardless of the weight difference. Workup, and pay attention to the freebore, as it's a Wby chambering. - dan

 

[ltmlt]

Just use 180gr data and do some development, you'll likely be able to slightly increase the charge weight of powder since the Speer bullet is 172gr

Not this time,
Anyway I will work up some loads with the powder I have but here is some data from my Speer manual #14 I have compare to what they give for their new bullets:
180gr. Grand Slam or Hot core with Reloder 19, max= 78.0gr.
165gr. Grand Slam or Hot core with Reloder 19, max= 80.0gr.
and for the 172gr. Impact with Reloder 19, max= 85.5gr. As you can see there is something different in the construction of their new bullet if you can go that high for the max load with that powder

 

[track]

My 300 Weatherby load, which I had for 20 years is: 84.5 grains of IMR-7828, 180 grain Nosler Accubond, Federal 215M, Weatherby Brass.