Are we worried too much

[beltfed]

Also, regarding that problem with brass availability.
The 32-40 BMW is a fine cartridge for Schuetzen that is considered an "falling off a log" cartridge
to get started. Brass will last forever since, ia person can shoot just one case and breech seat.
Can even use re-formed 30-30 or 32 Spl brass. I bit short, but works fine for smokeless loading

I believe a person would not be too far off to get a 10 or 12 twist 30 cal barrel and chamber it for the 30-30.

I know people that shoot the 38-55 BMW with good effect for a Main gun. Easier to see the 200 yds bullet holes

Quarter bore, some are shooting the 25-35 to good effect. No problem re forming 30-30 brass again
And the 38-50 Rem Hep can be used for both the BPCR and as a main gun.