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Thread: Precision Rifle v. Hunting Rifle

  1. #11
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    Quote Originally Posted by PracticalRifleman View Post
    To the 20” 6.5 Creedmoor advocates: oftentimes the velocity loss on 6.5 is greater than that of .308 Win. In my experience, a 185 gr Berger will hit 2600-2650 in a 20” rifle, while the 140 gr Berger in 6.5 hits 2500-2550 in a 20” rifle.
    So what is FGMM and Berger doing wrong to only get 2600 out of a 26" barrel?

  2. #12
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    My first can was .30 cal for versatility. Over time I added more suppressors for specific uses.

    I have a Bergara HMR for versatility since it's currently my only bolt gun. It's my range gun and my hunting rifle. Over time I'll add some more bolt guns for specific uses.

    The jack of all trades, master of none makes sense to me as an initial entry but maybe not the best place to be permanently.

  3. #13
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    Quote Originally Posted by Todd.K View Post
    So what is FGMM and Berger doing wrong to only get 2600 out of a 26" barrel?
    With the 185? I believe they advertise 2630 but they also don’t say what barrel length it is. Most companies don’t load their stuff for velocity but to be stable in a large variety of rifles.


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  4. #14
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    Handloads seem to be out of place in a beginner thread, but are yours "pressure sign" or pressure tested book loads?

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    Quote Originally Posted by Todd.K View Post
    Handloads seem to be out of place in a beginner thread, but are yours "pressure sign" or pressure tested book loads?
    Here’s a dirty little secret: The “book loads” aren’t pressure tested any other than the way a hand loader tests it. Modeling is used to estimate book pressures. Most, if not all the loads are tested with actual rifles.

    Let’s pretend the pressures were tested with lab equipment. That’s fine, but will that reflect actual pressure on your firearm? There are too many variables.

    But what I do know is that I have shot a variety of factory match ammo and handloads in my personal rifles. I have also seen dozens of students’ rifles in class shooting (only) factory ammunition. The 140 gr 6.5 Creedmoor is tested at 2690 in a 24” barrel. In the 20” guns it’s getting significantly less. It’s simple; the 6.5 Creedmoor is more sensitive to barrel length than .308 Winchester.


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  6. #16
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    I know what a pressure test barrel is and that they are used to make loading data.

    "Hodgdon reloading data is fired from Industry-Standard Test Barrels"
    https://www.hodgdonreloading.com/rel...ty-my-handload

    Back on topic.
    I recommended the 6.5CM mainly for the lighter recoil with a beginner, especially in a lighter multipurpose rifle. It will be more fun for most to shoot as well.

  7. #17
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    Quote Originally Posted by Todd.K View Post
    I know what a pressure test barrel is and that they are used to make loading data.

    "Hodgdon reloading data is fired from Industry-Standard Test Barrels"
    https://www.hodgdonreloading.com/rel...ty-my-handload

    Back on topic.
    I recommended the 6.5CM mainly for the lighter recoil with a beginner, especially in a lighter multipurpose rifle. It will be more fun for most to shoot as well.
    Many of the load manuals use actual rifles. I believe that may just be more common with bullet makers perhaps than powder manufacturers.

    See:

    http://www.6mmbr.citymaker.com/f/Sierra308Win.pdf

    As I said before, in short guns, you’re spot on with recoil. .308 will have quite a bit more than 6.5 Creedmoor. But energy for hunting and trajectory in the shorter rifles, I’ll pick up a .308 every time. Longer barrels, the 6.5 trajectory and wind resistance is great.

    Here’s some of my personal data measured with magnetospeed:

    22” 6.5 2610fps Hornady factory 140 match

    20” 6.5 2550fps Hornady factory 140 match

    22” 6.5 2740 FPS Sierra factory 130 gr Gamechanger

    24” .308 Win 2760 FPS Federal factory 175 gr

    20” .308 Win 2740 FPS Federal factory 150 gr

    20” .308 Win 2605fps Federal 185 gr

    18” .308 Win 2570 Federal 185 gr.


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  8. #18
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    Are those from the same barrels cut down incrementally?
    RLTW
    “Yep, it's definite. I simply don't care enough what you think.” -SteyrAug

  9. #19
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    Quote Originally Posted by 1168 View Post
    Are those from the same barrels cut down incrementally?
    No. That would be an interesting experiment, though.


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  10. #20
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    Bill Marr over at Rifleshooter.com has done a series of articles on the affects of barrel length on velocity where he cuts barrels down incrementally. They make for interesting reading, and he generally uses several loads in each test, though I don't think he's done a test with 175 smk or 185 juggernauts in the 308, at least not yet.

    6.5 Creedmoor:

    https://rifleshooter.com/2019/03/6-5...velocity-2019/

    https://rifleshooter.com/2016/02/6-5...p-a-creedmoor/

    308:

    https://rifleshooter.com/2014/12/308...ty-28-to-16-5/

    https://rifleshooter.com/2015/01/308...ld-medal-bthp/

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