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223 WSSM and 69gr SMK

 
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Old 04-12-2011, 04:00 PM
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223 WSSM and 69gr SMK

I recently aquired a 223 WSSM and have decided to try the 69 SMK in it. I never see anything about the caliber on here. just wondering about the general consensus of people who have used them. seems like a smokin lil bugger to me.
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Old 04-12-2011, 05:55 PM
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Re: 223 WSSM and 69gr SMK

WSSM Zone -- Your one-stop shop for all things WSSM including reloading data for the 223 WSSM, 243 WSSM, and 25 WSSM look for the reloading forums. always wanted to get the 223 wssm but never have gotten around to it. which gun did you get? let me now how it turns out.

will
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Old 04-13-2011, 12:30 AM
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Re: 223 WSSM and 69gr SMK

What's the elevation and temperature extremes where you shoot?
What is the twist and length of your barrel? What COAL does your rifle's magazine alllow?

The 223 WSSM cartridge is rated 64542 psi with 53.7 grains case capacity and a COAL of 2.360". A 220 Swift is 62366 psi and 47.0 grains case capacity. That's the closest common commercial cartridge. The 223 WSSM is between the 220 Swift Ackley Improved and the 22-284 wildcats.

I haven't tried shooting anything heavier than 55 grains in my Win 70 223 WSSM.
It has a 10" twist 22" barrel. I Belivee it would shoot the 69 SMK ok at the mile elevation where I shoot. I could probably shoot the 77 grain SMKs too. The questions are whether heaver bullets will fit in your magazine and throat with appropriate seating depth and whether they'll stabilize in the environment where you shoot.

Quickload shows that 69 grain SMKs driven with 90% SAAMI max loads of VV N560 or IMR-7828 SSC, velocities around 3400 FPS from a 22" barrel can be expected. Yes. Its a hot cartridge.

Don't expect great barrel life, but if you own it you might as well shoot it. I'm hoping for 1000 shots, similar to a 264 Win Mag or 7mm Rem Ultra.
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Old 04-13-2011, 08:36 AM
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Re: 223 WSSM and 69gr SMK

Lou,

I have the same rifle as you. I shoot at about 4-6000 feet depending on where I am and i might be shooting coyotes in 10 degree weather of prarie dogs in 80 degree weather. or just screwing around at 50 degrees. I think its going to be pretty fun. Just wondering what everyone else thinks about them.
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Anything less than overkill is underachievement!

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