Active Member
Jan 5, 2019
Denver, CO
LRH Members,

Looking for some general numbers. I happened upon a Winchester Model 70 shadow chambered in 300 WSM at a pawn shop. The action seemed somewhat long to me so I went and grabbed a caliper off the shelf and made an attempt to measure the magazine length... I think it is a shade over 3". This got me thinking about a custom throated 7mm WSM... Does anyone have load data for a 7mm WSM with a COAL of about 3.0-3.050, possibly even 3.1" (I am going to try to go re-measure tomorrow with a Hornady chamber gauge)? Looking for powder charge and MV. Would only be interested in the project if I could push 175 ELDX's or 180 Bergers at around 3100 FPS (safely) with a 24-25" tube.

P.S. Was I daydreaming or are the Winchester M70 Shadow WSMs a bit longer than your standard SA?

P.S.+ I am a hunter, not a benchrest shooter, is the 7mm-300WSM really worth chasing over the standard 7mm WSM?

Thanks in Advance LRH Members,

God Bless America. God Bless The 2nd Amendment. God Bless Those Who Defend Both.

Deleted member 25294

I built a 7-300 WSM on a long action, loading 180 ELDM's to 3.1" I'm getting 3000 FPS with RL26.
I would recommend going with the 7 WSM, brass is becoming more available, and if you built it on a long action you'll easily get the 180's up to 3050.
if you haven't bought a rifle yet I'd go with a Tikka chambered in a LA magnum round, simple re-barrel, and sanding the inside edges of your magazine with a dremmel tool and you'd be set.
I wouldn't build a wsm on a SA
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