Sharps question

[Buffalo Creek Law Dog]

When I do my daily walk, I listen to the old radio shows from the 1940s/50 on my Iphone.  Yesterday I was listening an old Hoppilong Cassidy radio show and he mentioned twice, a Sharps 450 rifle.  I never heard of one so, I Googled it and nil results on a Sharps 450 rifle.  Is it possible that this was an old fashioned term no longer in use or, the imagination of a script writer?  I tend to lean toward the latter but, then what do I know.

[Ranch 13]

My guess would be some script writers dream.
The term "big 50" was thrown around quite a bit in the early 1900's and was pretty generic for Sharps no matter the actual rifle was more likely a 44..

[PJ Hardtack]

I've got several Sharps reference books, including Seller's 'Bible' and there is no mention of a "450 Sharps".

[Buffalo Creek Law Dog]

Thanks guys, that's what I figured, a script writers error.

[Sir Charles deMouton-Black]

There is some cross-over between US and English cartridge nomenclature.

My Cartridges of the World, 3d Ed. shows ".450 Rigby Match (2.4")" as being identical to the .45-90 Cartridge. John Amber (Gun Digest) owned a Rigby-Metford-Farquhaharson rifle with cases headstamped "J.Rigby & Co. 1881". Amber apparently acquired the rifle from a Canadian shooter.

So, If a Canadian target shooter used this rifle, the existance of a Sharps target rifle in .450 Rigby Match is reasonable.

Remember that scene from Quigly DU, where ammo was being adapted from Brit stuff for his .45 Sharps?

[Ranch 13]

Rigby actually bought Sharps Creedmoor rifles and took them back to England.

[Buffalo Creek Law Dog]

It's possible that the script writer had heard the term .450 Rigby Match somewhere and assumed that was a common term and used it in the script.  To paraphrase ...Who knows what lurks in the minds of men......The Shadow knows