Home Forums Hunting & Shooting Gunsmithing Winchester Model 70 Mainspring

I have recently purchased a new Model 70 Classic in 300 Win Mag and I am interested in modifying it as follows: new Borden stock, Jewell trigger and Lilja barrel. I am considering changing the OEM mainspring to a stronger one to improve the lock time. If so, where can I acquire the stronger mainspring?

rstokes,
Brownells will be able to set you up.

Thanks for the help!

Just read the new Midway catalog last night and noticed they too are carrying the Woolf replacement springs, both 25# and 30#.

You don't want stronger, you want lighter; along with a lighter and stronger firing pin. Go to the Brownell's site and search for 'Tubb'.

A Tubb conversion kit is available for your rifle and will give you much better performance.

rstokes,
Like Redneck said, the Tubb conversion is a lot faster. The term "day and night" comes to mind. I've done 2 of these myself, one on a push feed and another on a CRF action. If I can do it how hard can it be? You will also need a different cocking piece to complete the job on your Classic action, and there is a chance that you will have to bush the firing pin hole in the bolt. I had to on one because the Tubb pin was a little smaller diameter, with primer cratering the result. Just changing the spring by itself will make some difference, on rifles more than a few years old you will notice a decreased lock time. I've done the heavier spring method too, the trade-off is you get a heavier bolt lift to go with the faster locktime.