Originally Posted by
Catchem
.................... If a 270 Win load is in the book, it is safe for rifles designed for that cartridge, but can I apply that load to an equally strong 35 Whelen? I think I can, if I work up slowly, but ...
Oh, just we're together, "S.D." is "sectional density".
What i just now did was visit a powder supplier website and compare 270 loads with 35 Whelen loads. First thing i noticed was mostly different powders were used for the two caliber. Then..................it took me some looking, but i finally found a powder used for both caliber.
IMR 4895 was the common powder.
The 150g .277 bullet and the 250g .358 bullet have the same SD of 0.279.
The .270 load with the 150g bullet, was 44.5g which produced
50,600 cup.
The 35 Whelen load with the 250g bullet was 53.5g @
50,300 cup.
It seems to me, you can safely work up from a 270 load to the 35 Whelen load. However, it will take so long you will miss hunting season. Another problem i foresee, is if you are using a popular/common 270 powder, the 35 Whelen case will fill up and overflow, before you reach a suitable charge.
Going from 244 to 257 could be doable, and should be safe, but i didn't research any loads for these caliber.