That is basically true. You can buy a custom smokeless barrel and put on a Remington 700 mzl action. You are looking at some serious money for that. However, they are some serious shooters in the right hands.
I went to an Encore 45/70 conversion this year and love it. That is an expensive route if you don't have an Encore already. A lot of people convert a CVA Apex. They are nice. My bnl has one. He sold his savage and went to a conversion as soon as he saw mine. . You can also convert an H&R and there is another cheaper CVA, Scout I think. Checkout the smokeless forum here. I am a rookie myself but have read a lot about it here and on Doug's message board which is a place you definitely need to check out.
Good luck. There are quite a few guys on here now that have conversions.