I believe you are thinking about the 460 Rowland.
It has a slightly longer case.
45 Super has the same case length as 45 ACP and runs at lower pressures than a 460 Rowland.
If a 45 ACP action is strong enough, you can shoot +P and 45 Super out of it.
That said I dont think 45ACP is worth the aggravation in a Savage bolt action Rifle.
I just attempted to set one up on an intermediate length Mauser and after much frustration I figured out it just was not going to feed with that feed ramp which is different than a 98.
The kit they sell has a Savage type barrel with a nut and a magazine adapter. Sold by Rhineland Arms.
Finally after about 2 days of frustration I figured it was just not going to feed and decided to ream the Rhineland Arms barrel to 450 Bushmaster which hasnt happened yet.
Supposedly a Mauser 98 will work but after what I went through I dont want to even try it.
An Enfield is supposed to be the bolt rifle to convert to a 45 ACP. It supposedly works well.
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