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Thread: 8mm on a romy kit?

  1. #21
    Gunco Regular acmech's Avatar
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    When this came up before someone posted pics of their saiga .308 trunnions and they were much bigger than a regular ak, I think they also had 3 locking lugs, not 2, I'm sure they did that for a reason. It was determined then after careful study of what was available that the yugo kits would be the best to experiment with.
    In otherwords, exactly what hcpookie said.

  2. #22
    GuncoHolic Sprat's Avatar
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    I didn't post to debate, but I just think that standard 7.62x39mm trunnion may not be strongh enough, yah I know commerical 8mm is low and you can reload for it. I just feel more comfortable with a 308/7.62x54r trunnion and a RPK/Romak3 reciever or blank .60 in thickness. over large mag well is included in the Romak 3 design
    mags you can use that are existing 8mm mags ex. mg13, hakim, cz or bar mags

    the romak 3 54r bolt can be utilized for a 303 british conversion ( thought about this as only the barrel is a problem 308 vs 312 almost a shame the romak3 kits were like new not shot out? the 303 barrel would also allow you to convert to 7.7 jap with a 308 bolt

    Sprat is losing it did he say 7.7 jap AK -47!!!!!!!!!!!

    once the kits start coming in without barrels you will not find these post funny

    sprat

  3. #23
    No Hope For Me 1biggun's Avatar
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    . a 303 british on a romak would be cool allthough 303 has a smaller bolt face .540 vs .570 . dont the 303 british and the 7.62x54 both fire a .311 bullet? I have read that there is a large variance in bores on the 303 from.308 up to .317. I bought some 180 grain bullets designed for the 303 british to try to do a 7.62x39 whisper and they mic'd out at .310. the romak .570 bolt face would be a problem on a 8mm or 308 build with a .473 bolt face. the romak mag most likely would be to short on a 8mm 3.037 vs 3.250 OAL length

    the saiga has three lugs on the 308. the yugo m77 and the m76 (308 and 8mm full auto AK,s) have only two I Think (could be wrong) the valamet 308 has only 2 and advertises it uses the full auto trunion some were on ther site.

    I am going to build a 7.62x51/308 on a Yugo M70. I am going to use the military 7.62x51 brass with the smaller case capacity due to thicker brass. I will hand load middle of the road loads for it as well and will not use surplus ammo in it.
    I also am going to find some one who knows math better than my self and figure the bolt thrust of the 7.62 x 39 loaded at 50,000 CUP ( there are published loads at this pressure) and the bolt thrust of the 308 rounds loaded at around 42,000 cup ( a middle of the road published load) and compare them. I have concerns as well if the bolt shear strength of the AK is safe thus my first post here around a year ago.

  4. #24
    Gunco Member bert01's Avatar
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    what im using for a bases on the bolt and trunnion i want to machine is my winchester model 70 it has only 2 lugs, yes i know they are A LOT BIGGER than any ak thats why im using it, in probably 4130/4140 heat treated steel

  5. #25
    Gunco Member bert01's Avatar
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    oh yeah, using the same carrier

  6. #26
    GuncoHolic Sprat's Avatar
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    I have always used .312 when reloading 303. Depending on wear, yes 303 could/should run .310 to .312 plus.
    I have loaded 308 147gr gi pull in 7.62 x 39mm cases, yes they shot fine but the projectiles always came loose, not much to crimp to.

    yes the romak3 mag is too short for 8mm, but 303 fits, wonder if 303 bren mags can be adapted

    as far as the bolt face, I fitted a 303 live case into the bolt and a 7.62 x54r live case, the was very little play and the 303 round was tight and required a little tension to peel off the bolt face.

    because of the overall length of standard military 8mm the romak 3 design would have too be enlarged in the front & reduced at the rear so that the top cover fits

    sprat

  7. #27
    No Hope For Me 1biggun's Avatar
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    good info on the bolt head working on the 303. I was only comparing measurments and did not have the componets in my hand to play with. I am ordering a 308 crimp for my dies. I built a pistol with a .308 bore barrel in 7.62x39 (15" barrel) that I plan on loading 308 dia 150 grain bullets for. also picked up a neat cannelure cutter so I can adjust the bullet depth were I want it and crimp it in good. may hurt accuracy time will tell.

  8. #28
    Happy Camper hcpookie's Avatar
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    This is on a different thread, but the .303 and Russian 7.62 bullets are the same diameter, and therefore if you had a ROMAK-3 / PSL kit, you could in theory rechamber the 7.62x54r barrel for .303. Assuming pressures would be the same, the parts could probably work as well. Can't imagine they would be drastically different.

    Not to hijack this thread. The .303 vs. .308 vs. .311 discussion in on my thread started about Bren barrels.

    HTH

  9. #29
    GuncoHolic Sprat's Avatar
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    Yes I agree the barrels run a gambit in bore diameter, I didn't see your thread on bren barrels, and I would like too.

    I saw the ad for brens s/a in7.62x54r and figured it was possible but the 303 case base above the rim is .454 vs 54r .483 so the chamber will be .29 too large and to set the barrel back it would have to loose the of end of the chamber and then recut/ream the chamber. and adjust the gas tube and handguard.
    I thinks its easier to fit a surplus 303 barrel.

    7.7 mm jap mic;s out to.469 but this conversation requires a 308 bolt and larger mag 8mm or 30'06

    or am I missing something, are you saying that all thats needed is to ream the chamber?

    Sprat

  10. #30
    Gunco Member kevin917z's Avatar
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    i dont think i would use turk ammo. I would be nervous with 8mm in a stamped receiver

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