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Thread: 300 AND 270 WSM Sagia

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    No Hope For Me 1biggun's Avatar
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    Default 300 AND 270 WSM Sagia

    I have a 300 stainless 300WSM coming. origionaly I was going to use it on a 300 savage 0r 308x39 or 7.62x25 rechambering. I got to staring at the case last night and also the reloading books and other stuff an putting it in differant mags and Im convinced that it could be done on a Saiga 308.

    The bolt thrust increse would increase as the case head is .551 so im not certain what the 308 sagia can handel and full pressure magnum loads might be out but there was some really interesting starting and medium loads that will out perform the 308 and the 30-06 at sane pressures. you can get a 150 grain going over 3000 fps at under 50,000PSI.

    i havent done the math ( cant I dont now how) but Im thinking if one rebated the rim as there is no way in hell im messing with my bolt face, that a damm good round could be made for long range shooting with the high BC 200 grain stuff. Im going to hit one of them damm praire dogs at 1000 yards with a AK variant if it kills me trying. the 270 shoots really flat as well and there are some 6.5 wild cats as well.

    also the 280 remington is a doable round on these guns and all the other rounds based on it. the 6.5-280 is really popular and brass is being made.

    the 280 brass is already rebated btw and fits the bolt as is I was considering a version(6.5-280) of it on a two lug action with super long barrel and slow powder and 40,000 PSI pressures it would have some velocity gains if loaded light over the 308 family of brass. I might be able to reach high pressure 260 remington speeds this way in a 2 lug build at lower pressures.

    If I get this threaded trunion thing figured out for switch barrels I might try doing it to My 308 sagia and screw on a WSM or 6.5x280 barrel.

    I have this virgin POS sagia that is useless as is calling my name.
    Maybe USdrgonove (spelling) can ask them boys what will a 308 Saiga handel along with the same questions for the two lug stuff.

    A 1-8 twist 300 WSM witha 30" heavy barrel would reach out and touch something nad make a big hole in it

  2. #2
    No Hope For Me 1biggun's Avatar
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    These are starting loads from hodgen powders. for the 300 WSM you could go even lighter and still beat the hell out of a 308 WIN On a Saiga 308 bolt you could go up some That 220gr at 2522 FPS is a 100 grains heavier and still 200FPS faster than a 7.62x39! bet it kicks like hell to.

    the 125 grain load in a pistol on deer would be pretty slick. at 3243 FPS and a 1000 FPS FASTER than the x39! would loose some speed in a 14" barrel Im sure.

    110 GR. SPR SP IMR IMR 4007 SSC .308" 2.650" 66.7 3426 52,300 PSI

    125 GR. NOS BT IMR IMR 4007 SSC .308" 2.810" 65.8 3243 49,700 PSI

    150 GR. SPR GSSP Winchester Supreme 780 .308" 2.780" 69.6 2940 48,900 PSI

    190 GR. SIE HPBT IMR IMR 4831 .308" 2.860" 60.0 2679 49,300 PSI

    220 GR. HDY RN Hodgdon Hybrid 100V .308" 2.830" 57.0 2522 49,300 PSI

  3. #3
    No Hope For Me 1biggun's Avatar
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    Man i need the bolt thrust numbers on these loads compared to a maxed out 308 at 63,000PSI. this might be happening If i can do a couple threaded trunions I might screw the Saiga and take her to the max. LOL Got the tube

    Bolt thrust= area x psi

    Area = 3.146 x ( (case head diameter / 2)^2)

    ?????????????????????????????????????????????????? ?????????????????????/
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    Gunco Maniac sjohnson's Avatar
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    Quote Originally Posted by 1biggun View Post
    Man i need the bolt thrust numbers on these loads compared to a maxed out 308 at 63,000PSI. this might be happening If i can do a couple threaded trunions I might screw the Saiga and take her to the max. LOL Got the tube

    Bolt thrust= area x psi

    Area = 3.146 x ( (case head diameter / 2)^2)

    ?????????????????????????????????????????????????? ?????????????????????/
    It doesn't matter what the external case head diameter is, it's the internal case head diameter that counts. See Lilja Precision Rifle Barrels - Articles: A Look at Bolt Lug Strength

    The chamber pressure acts on the internal diameter and that force is directly transmitted to the external case head. While using the external diameter can be an OK first approximation for rimmed or non-rebated cases, rebated cases especially need to take the internal diameter into consideration!

    I are a eng in ear so small things like life and limb matter
    I have a daughter. I tell her, "911 is what you dial after you're raped. 1911 is what you should have before they try."

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    Gunco Regular allesennogwat's Avatar
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    Also look at the Remington short ultra magnum. It's shoulder might feed better. It doesn't hold quite as much powder or isn't loaded as hot but almost. Armalite chambered the Remington one. They had a deal with Remington but then they had a falling out. Then the company that bought Remington then bought DPMS. The Winchester is likely most popular as it's considered a "better" cartridge but the Remington might be better for a semi auto. Some magazine and feeding issues in the linked PDF.

    http://www.armalite.com/images/Tech%...0%E2%80%A6.pdf

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    Gunco Regular allesennogwat's Avatar
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    Oh yeah and now there is the 300 Ruger Compact Magnum too.

    300 WSM Compared

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    No Hope For Me 1biggun's Avatar
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    Im aware that we need to use Ids of case heads I just wanted to compare them The actual thrust dont really matter to me Im just more interestd in when Im at the same thrust. Hope thaat makes sence. but your right we should only post correct numbers so they can then be used in other calculations. I wish i could do the mathe.


    I have a a 300 short mag barrel two actualy so that what Im looking at for now.

    there is also the old 6.5 remington mag that was reintroduced a while back.

    I can always rechamber but on a factory rem barrel if you cut off much its hard to maintain the factory size threads. Im shooting for a 1 1/6-16 thread on the 23mm trunions how ever a 1"- 12 will work also Im not sure if after I turn off the threads Ill still be at or over 1" and then I couldent use barrels that I want to keep the original chamber. Its a catch 22. I have about 10 differant calibures in factory remington barrels now so theroeticaly I can make one reciver shoot thim all by cuttin the threads longer and taping a trunion. Im tired of building recivers for every gun.

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    No Hope For Me 1biggun's Avatar
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    Houston we have a problem a 300 wsm will not clear the bolt lugs on a
    m70 trunion so a custom bolt is out for this.


    However it does clear the 308 Sagia trunion so there is hope still of it happening .

    I never noticed how much wider the lugs were spaced On the 308 trunion before i just thought the bolt was bigger od and the trunion was relived for it, not so. they obviously designed this for something bigeger than 308. that 9mm russian round possably???? Interesting I had forgot about checking lug widths untill the other 45-70 tread reminded me.
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    Gunco Member 6500rpm's Avatar
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    What gas block is that being used on the moc up?

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    Gunco Veteran Viper Dude's Avatar
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    The gas block appears to be from an FAL. They are very close to the spacing of an AK gas system.

    VD

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