I have a single shot 1885 in 260 Remington.

I like to shoot long bullets like the Barnes 127 LRX, and the rap against the 260 Rem is for typical short-action magazines the bullets need to be seated too deep, taking up potential powder volume and limiting velocity.

But cartridge OAL isn't a limitation with a single shot. For those of you that know the 260 Rem cartridge, would it be worth it for me to have the throat lengthened? What might I gain in velocity?

Please don't suggest other cartridges (or ask me to post pictures of the rifle!)... just share the likely benefits of lengthening the throat on a 260 Rem.

Thanks,
GC