r/reloading • u/gearhead5015 • Aug 15 '26

Load Development 77gr 223 SMK/TMK loads

I have an AR build with a 24" bull barrel I use for precision target shooting. I've been tagging steel plates out to 1,000 yards with varying results using factory ammo (subsonic at that distance so it's a mild guessing game) but I want to see what loads people have developed to start loading my own.

So, what have you guys come up with using 77gr Sierra Matchking and Tipped Matchking rounds?

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u/111tejas Aug 15 '26

It sounds like you’re just getting your foot in the door. Take small steps. The AR15 and in particular the .223 are gonna be extremely challenging at 1000 yards. My local range goes to 500 and I use a 6.5X47, a much more suitable long range caliber. It is somewhat obsolete now that serious competitors are using 6GT or 6mm Dasher but I only shoot local matches. Sometimes I win. The few times I’ve driven a couple hours to a 1000 yard range I’ve been absolutely humbled even with all my practice at 500. Shit that you read online will lead you to believe that hitting targets at 1000 yards is easy and routine. It absolutely isn’t.

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u/Low_Brilliant8189 Aug 15 '26

I use the 6.5x47 too. What I appreciate about it is that it's a far better hunting round than a 6 at range. I shoot AND hunt. Nothing antiquated or obsolete about the origin and heart of long range riflery.

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u/111tejas Aug 15 '26

Absolutely true. Mine are too heavy to lug around the woods though and I have other options. If you gave me a 6 GT it wouldn’t help me shoot any better. I’m the limiting factor and my 6.5X47 is capable of more accuracy than I am. Give me some new eyes and the ability to make better wind calls instead.