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Thread: 7mm RM rechambering

  1. #31
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    Thanks mate

  2. #32
    Member chainsaw's Avatar
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    if you're keen on a non belted 7mm mag, do some home work on the 7mm BlaserMag.
    Name:  7mmFamily.jpg
Views: 162
Size:  1.22 MB
    It will fit your mag better & will give you ~ 100fps over a 7mmRM burning less powder .
    Not quite up there with 7-375 or N28's in terms of speed (~100 - 150 fps) but an extremely efficient and accurate cartridge. I have all three - RM, BM & N28 - so can provide a real world side x side comp.
    Ask @Kiwi Greg about 7mm BM vs other options.
    GWH, Moa Hunter and Grimus like this.

  3. #33
    Member Matt2308's Avatar
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    Reading what you are trying to achieve, Iíd suggest doing things properly the first time, probably saving yourself money in the long run and re-barrelling your T3 to 7 Blaser Magnum.

    This gets rid of the belt and a 26Ē 1:8
    7 Blaser will push the 180 ELD-M at well over 3050fps, these ballistics are VERY hard to beat in any other sensible cartridge combination.

    IF you have the skill, it will also kill big bodied red deer at over 1000m and is very capable of hitting steel to well over a mile consistently.

    I initially went the 28 Nosler route, had some fun and burnt through that barrel in 800 rounds, re-barrelled in 7BM and am very happy with the results.
    Itís an excellent long range cartridge.
    Grimus and dirkvanvuuren like this.

  4. #34
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    Quote Originally Posted by chainsaw View Post
    if you're keen on a non belted 7mm mag, do some home work on the 7mm BlaserMag.
    Attachment 128186
    It will fit your mag better & will give you ~ 100fps over a 7mmRM burning less powder .
    Not quite up there with 7-375 or N28's in terms of speed (~100 - 150 fps) but an extremely efficient and accurate cartridge. I have all three - RM, BM & N28 - so can provide a real world side x side comp.
    Ask @Kiwi Greg about 7mm BM vs other options.
    Given what I want to do the 7BM is looking more and more likely, thanks for the side by side comparison
    GWH likes this.

  5. #35
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    Hindsight is a wonderful thing. I bought the T3 early last year, knowing the 7RM and loving it. And then went and snapped my Achillesí tendon... twice. And while recuperating after a couple surgeries (and still working on it), going nuts stuck at home I managed to talk the wifey into setting myself up with reloading equipment. To keep the mind ticking over. But that also opened the wild cat door.

    So if I could, Iíd do things a little different for sure. But, Iíve got what Iíve got, and Iím using that.

  6. #36
    Member chainsaw's Avatar
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    here a comparison including N28.
    Name:  IMG_1877.JPG
Views: 159
Size:  690.6 KB
    I'm getting ~3060 fps with 7BM with 180 VLDs & RL26 with groups around 0.3moa if i do my part well.

  7. #37
    Member Matt2308's Avatar
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    How far have you pushed your current set up?
    Itís possibly a lot more capable than you think it is.
    A 168 Berger or ABLR in front of Retumbo or RL26 is no slouch on long range steel or animals.
    GWH and Grimus like this.

  8. #38
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    Quote Originally Posted by Matt2308 View Post
    Reading what you are trying to achieve, Iíd suggest doing things properly the first time, probably saving yourself money in the long run and re-barrelling your T3 to 7 Blaser Magnum.

    This gets rid of the belt and a 26Ē 1:8
    7 Blaser will push the 180 ELD-M at well over 3050fps, these ballistics are VERY hard to beat in any other sensible cartridge combination.

    IF you have the skill, it will also kill big bodied red deer at over 1000m and is very capable of hitting steel to well over a mile consistently.

    I initially went the 28 Nosler route, had some fun and burnt through that barrel in 800 rounds, re-barrelled in 7BM and am very happy with the results.
    Itís an excellent long range cartridge.
    If you are happy to single feed, a real easy solution could be to just increase the throat length on your rifle while keeping it as a 7mm mag. Seat the projectiles way out, which will free up case capacity for more powder resulting in a bit of an increase in performance without expensive brass & without burning disproportionately more powder.
    Once that barrel is toast and you have some practice under your belt then put together something that is a bit more niche. (specialty cartridge, faster twist /longer barrel)

    I recently got a long throated 7mm mag put together. It got up to 309x fps without pressure signs shooting the 180ELDMs. It would have gone higher but that's where my ladder test that i'd loaded up stopped so have no data past that. It does have a 30inch long barrel though.
    Just something to consider.
    Name:  7mm mag.jpg
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    Last edited by ChrisW; 14-01-2020 at 01:57 PM.
    7mmsaum, GWH, Moa Hunter and 2 others like this.

  9. #39
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    My long throated 7RM has a COAL of 91mm, which leaves around 2mm of space in the standard T3 magazine. 7BM would give you more still.

  10. #40
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    Can you even have the factory tikka barrels reamed anymore?

  11. #41
    Member wsm junkie's Avatar
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    Out of curiosity, who will ream a Tikka barrel these days?
    When i wanted mine done neither Gunworks or Hardy would do it.

  12. #42
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    Quote Originally Posted by Stocky View Post
    Can you even have the factory tikka barrels reamed anymore?
    Quote Originally Posted by wsm junkie View Post
    Out of curiosity, who will ream a Tikka barrel these days?
    When i wanted mine done neither Gunworks or Hardy would do it.
    Advice on here says that Kiwi Greg at terminator products does, I’ve pm’d him, just waiting for a reply

  13. #43
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    Quote Originally Posted by wsm junkie View Post
    Out of curiosity, who will ream a Tikka barrel these days?
    When i wanted mine done neither Gunworks or Hardy would do it.
    Arthur Cleland will I think

    Sent from my CPH1903 using Tapatalk
    wsm junkie, superdiver and Grimus like this.

  14. #44
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    Quote Originally Posted by Grimus View Post
    Advice on here says that Kiwi Greg at terminator products does, I’ve pm’d him, just waiting for a reply
    Let us know how that gets on with Greg.
    Grimus likes this.

  15. #45
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    Quote Originally Posted by Spitfire View Post
    My long throated 7RM has a COAL of 91mm, which leaves around 2mm of space in the standard T3 magazine. 7BM would give you more still.
    Cancel that - absolute rubbish. Getting my rifles confused. It’s either impending senility or I have too many rifles.
    Moa Hunter likes this.

 

 

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