You surmise correctly. Any 458 caliber rifle will accept them. I cast and size my 45 rifle bullets to .460" diameter. I find that they shoot a bit more accurately at that diameter.
I have no idea about the middle bullet and what it is coated with. It's still lubed conventionally though.
You should be OK with bullet number three. for light loads, I don't always lube every groove.
Clean your barrel well and then look to Lyman or RCBS for load suggestions. I only shoot 405 grain bullets in my 45/70s, but many find the 300 grain bullets the bees' knees. Stay around 1,100 to 1,200 fps for starters. A slower flake pistol powder will probably be a good choice for light loads and your bullets.
I have no idea about the middle bullet and what it is coated with. It's still lubed conventionally though.
You should be OK with bullet number three. for light loads, I don't always lube every groove.
Clean your barrel well and then look to Lyman or RCBS for load suggestions. I only shoot 405 grain bullets in my 45/70s, but many find the 300 grain bullets the bees' knees. Stay around 1,100 to 1,200 fps for starters. A slower flake pistol powder will probably be a good choice for light loads and your bullets.
