When did Savage switch to the 4.4 spacing?

For some reason I thought all WSM rifles were large shank 4.4 spaced rifles. Well I was wrong. I got a large shank 4.27 action with a great 450 Marlin barrel but a thumb hole stock for a 4.4 rifle. When did they change? Since 4.27 stocks seem limited and pricey, I am considering another rifle with the proper action for the stock I have and a little mix and match.

Thanks
Micky