Wanting to buy ruger m77 RSM 458 lott


New member
Apr 17, 2021
Reaction score
I'm looking to buy a ruger RSM 458 lott ,would consider RSM In 458 win mag thank you
The true RSM was never manufactured in 458 Win Mag. The RSM is a Mark II. But has an integral quarter rib machined in as part of the barrel. Pretty unique and special feature of that model. And the word is that Ruger lost money on each and every one. But built them because Bill wanted to, and could afford to. The RSM also has a few other special things about them.

The 458 Win mags I've seen are older model guns prior to the Mark II. No quarter rib. Nothing special.
Last edited:
A picture of quarter rib. Visual help.

Forum statistics

Latest member



Latest posts

Latest profile posts

looking for 300 h & h flanged ammo
Looking for shipping advice. I will be hunting in Limpopo in March, and was wanting to know a general idea of shipping costs to return my mounts to the US when completed. Air or sea? Only plains game hunting.
BLAAUWKRANTZ safaris wrote on gpiccs94's profile.
You are welcome to join our family at Blaauwkrantz in February. We have been hosting international hunters since 1978 and known to be the best kudu hunting in the world! we are based on our 100 000 acre ranch, an hours drive from the Port Elizabeth airport. Please email me on info@blaauwkrantz.com
CrippledEagle wrote on 7MAG's profile.
Good morning 7MAG. I have a NEW, never mounted, Leupold M8-4X Extended Eye Relief scope that I will sell you for $325 shipped to you. I was a Leupold rep for 12 years and this was always our preferred mounting for a lever gun, scout rifle style.
DLSJR wrote on Will Clark's profile.
You’ve got an interesting screen name. Will the Thrill provided lots of great times for me as a lifelong Giants fan. Even though I never met him, a number of buddies either duck hunted or shared a dugout with him. He’s a great guy according to those guys. Cool screen name and if that’s your real name, it’s a great one.