.510 Whisper Loads, Primers

[Jim Buck]

I am getting ready to work on loads for the .510 Whisper and 300 Whisper.

Any Recommendations for primers on either one, I was not sure if a large rifle primer was sufficient on the .510. Data is hard to find. Any thoughts on 300 greatly appreciated as well.

 

[wakajawaka]

Re: .510 Whisper Loads, Primers

I have an SSK .500 Whisper. I believe other than a different parent case, they are pretty much the same.

Mostly, I'm shooting a cast Hoch 650gr Plain Base Nose Pour.
CCI 250 primer.
36gr of RL 17, 10 shot average of 1127fps.

647gr surplus pulled ball were a little slower with the same load, 1094fps.

I have not tried any other primer.

I would think IMR-3031 and 4198 would work as well as I have had good luck with them in the 50 Alaskan along with RL-7.