375-303 British Questions

[leeenfield]

Does anyone load for this round? I am about to do so and have a couple of questions.

First, there is so little shoulder left on this case after forming that it might as well be considered a straight-sided case. Do you use a standard 2 die set (case sizing and neck expanding in the same die) or will a separate neck-expanding die be required?

Second, does anyone have any load data to share? I will be using a 270 gr gas check boolit and my current powder stock includes 4759, 3031, 4895 W748, W760.

Thanks for any help forthcoming.

[sthwestvictoria]

Have a look at this thread, maybe send a PM to JeffinNZ:

http://castboolits.gunloads.com/showthread.php?20340-303-Brit-375&highlight=375/303

This thread as well which has the JDJ 375 load data (however I believe JDJ uses the .444 as parent case):
http://castboolits.gunloads.com/showthread.php?175823-40-303-versus-357-303-wildcat-for-hunting/page5

[Outpost75]

Treat it as a straight-wall case. A 14" twist works well with#375449, use.38-55 data as starting loads and work up from there. In a good No.4 action a caseful of RL7 is a moose killer.