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  1. #1
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    77gr Sierra MK load recipe?

    After I have assembled my personalized SPR I will start reloading (not new to reloading) for it. I have a 75gr Berger load that I've used in a previous 1/8 twist 24" barrel AR15, but I want to add 77gr SMK to the list as well.

    If anyone is willing to share recipes, much obliged. I'll be shooting them through a 18" barrel. I'll be purchasing the bullets with cannalure.

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  3. #3
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    Thanks. There is some sparse info there about 77gr SMK loads, but only with Ramshot TAC and Vitivhouri (sp?) powders. Neither are common for me.

    Hodgdon Varget or 4895? Winchester powders?

  4. #4
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    I can't help as all I've got are 55gr fmjs and h335. But feel free to post all your recipes over there! I need to get some info on 75-77gr too, my gun needs a heavier bullet

  5. #5
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    I found my 73gr Berger load. Posted it on your thread.

  6. #6
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    Im working with Nosler 77's at the moment...

    Dont think there is much difference, other then price..

  7. #7
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    Quote Originally Posted by mustangfreek View Post
    Im working with Nosler 77's at the moment...

    Dont think there is much difference, other then price..

    Not saying it applies to SMK vs Noslers, but some bullets have remarkably different ogives and bearing surface lengths that can alter powder charges by half a grain--sometimes more. Of course, all are being loaded to a COAL of 2.260" max, so it's not so much of a huge concern.

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    Quote Originally Posted by Nathan_Mack View Post
    Not saying it applies to SMK vs Noslers, but some bullets have remarkably different ogives and bearing surface lengths that can alter powder charges by half a grain--sometimes more. Of course, all are being loaded to a COAL of 2.260" max, so it's not so much of a huge concern.
    Oh i get that, i was more or less just saying ...for me so far i have seen no real difference between the regular SMK's vs the nosler 77's and actually for me a slight edge to the noslers..Which is better as there cheaper..lol..

    Do want to get some of those new tipped MK's to play with...

  9. #9
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    Quote Originally Posted by mustangfreek View Post
    Oh i get that, i was more or less just saying ...for me so far i have seen no real difference between the regular SMK's vs the nosler 77's and actually for me a slight edge to the noslers..Which is better as there cheaper..lol..

    Do want to get some of those new tipped MK's to play with...
    My one concern, which I don't get many definitive answers for, is the benefit(s) of using a cannalured bullet with a light crimp. I am not toting the ammo around as a soldier would, but it will be subjected to semi-auto operation and storage in magazines. M4 feed ramps help reduce setback issues with bullets, but I tend to err on the side of caution in this area.

    Sierra cannalure bullets are more expensive than the ones lacking a cannalure.

  10. #10
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    Crimp or no crimp is a debated topic kinda like .45 vs 9mm from what I've seen in the reloading community. I am in the "no crimp" camp.

    I have been loading 5.56/.223 for a few years. All of my cannelured bullets are 55gr FMJ "plinking" rounds...and crimping requires a uniform case OAL and constant trimming. For my non-match range ammo, I don't trim that often so I wouldn't get a consistent crimp. I also read about a "Test" online: push a loaded round, bullet first, into a 2x4 firmly (not like you're striking it down, just push) and see if you have any setback. If the setback is noticeable then I'd look into why the neck tension isn't sufficient enough.

    I have no gripes with people who DO crimp...I just personally haven't felt like its a requirement for my loading needs.

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    Quote Originally Posted by Former11B View Post
    Crimp or no crimp is a debated topic kinda like .45 vs 9mm from what I've seen in the reloading community. I am in the "no crimp" camp.

    I have been loading 5.56/.223 for a few years. All of my cannelured bullets are 55gr FMJ "plinking" rounds...and crimping requires a uniform case OAL and constant trimming. For my non-match range ammo, I don't trim that often so I wouldn't get a consistent crimp. I also read about a "Test" online: push a loaded round, bullet first, into a 2x4 firmly (not like you're striking it down, just push) and see if you have any setback. If the setback is noticeable then I'd look into why the neck tension isn't sufficient enough.

    I have no gripes with people who DO crimp...I just personally haven't felt like its a requirement for my loading needs.
    I shot a lot of 73gr Berger .223cal rounds in my old RRA Varmint rig and never any issues - and never crimped them now that I think of it. So I can see your point. Maybe n I'll just save the extra $10 per 100 bullets and buy more powder.

  12. #12
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    Quote Originally Posted by mustangfreek View Post
    Im working with Nosler 77's at the moment...

    Dont think there is much difference, other then price..
    We shoot them to 1000 yards and they are every bit as good as the SMK.

  13. #13
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    My pet load for 77gr Mk262ish ammo runs off of 8208 XBR. It's a little on the fast side compared to what is rumored to be the real 262 powder. So I only get to about 2730-2740 fps out of a 20" barrel. That's plenty of velocity for me and gets the bullet to 1000 yards accurately.

    My charge is 23.4 gr. This should be worked up to, if anyone tries it, as it is over published max.

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    Quote Originally Posted by markm View Post
    My pet load for 77gr Mk262ish ammo runs off of 8208 XBR. It's a little on the fast side compared to what is rumored to be the real 262 powder. So I only get to about 2730-2740 fps out of a 20" barrel. That's plenty of velocity for me and gets the bullet to 1000 yards accurately.

    My charge is 23.4 gr. This should be worked up to, if anyone tries it, as it is over published max.

    Cool..good info..just picked up a pound of 8208 XBR to play wit h, for the 77's

  15. #15
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    I could almost go 100% XBR and be happy. It's not perfect, but it's a great do all powder. I got 55 gr balistic tips to stack nice hole, and on the flip side it runs 77s like a champ.

    H322 is always my accuracy king, but XBR is a great powder to have.

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