Don't know where to put this cause we really don't have a BPCR section. Have any of you used 777 in a cartridge, and, if you have, what have you found out about compression?
I know Goex likes quite a bit of compression, and have used that in my 40-70BN and in a 45-70. I've read that Swiss doesn't like to be compressed, and is higher in energy than Goex, and that 777 is similar in energy. I'm planning on loading for this combination gun and thinking that the 10.5x47mm case is a little small for the bullet size. Thus I'm thinking of using 777 for the little extra energy it can give me over Goex, and is locally available. I'm not ready to buy a case of Swiss.
I'm currently planning on a bullet in the 250-280gr range. What will I need for lube grooves when using 777? With Goex I'd need several, or a cookie. I'm looking at the NEI catalog, at #229 cut with one or two lube grooves, or#230 cut without the gc.
Any advice?