Laser boresighter for 300 Savage

I ordered a new laser boresighter for my Savage model 99 in 300 Savage off ebay. It's a Sight Mark brand. The auction advertised it as being for 300 Savage caliber but when it arrived the package says .22-250. I know some of these work on multiple calibers. Does anyone know if this will work in 300 Savage cal before I open the package?
The SightMark website advertises the .22-250 model as: (Can be used with the following: 22-250 Remington, 22 Standard Varminter, 250/3000 Savage) but does not mention 300 Savage. Any thoughts?

Jim

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Originally Posted by _Jim_

"...The SightMark website advertises the .22-250 model as: (Can be used with the following: 22-250 Remington, 22 Standard Varminter, 250/3000 Savage) but does not mention 300 Savage. Any thoughts? Jim"

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Well, the 22-250 is a neck-downed version of the 250-3000 Savage, but you'd have to check "Cartridges of the World" or a "Lyman Reloading Manual" for diagrams of case sizes to check if the 250-3000 Savage is based on the 300 Savage case. Sorry, I don't know the answer to that; but with a little Google work, you might be able to check this out.

Old No7

The 250-3000 (1915) predates the 300 Savage (1920) and is indeed it's parent case. (via my well worn copy of the Cartridges of the World, by Frank Barnes.) will it work??? Frank didn't mention that...