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Thread: Chamber Pressures

  1. #181
    Gunco Regular allesennogwat's Avatar
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    I always found these pressure ans velocity results interesting. When I first started handloading I loaded a recommended match load of 308 Win in military (or old IMI 308) cases. Newer IMI 308 "match" cases are said to be closer to commercial case capacity. The load was a Hornady 168 grain bullet with 41.0 grains of IMR-4895 and a Remington 9 1/2 primer. The load never showed any overpreessure and was super accurate. The recoil seemed heavier than factory 147 grain ball ammunition so I didn't want to load any hotter. Not sure if the addition recoil was only because of the heavier bullet or if the gas pressure was slamming the op rod and bolt harder in recoil. Nothing ever broke and I didn't load hotter.

    A few years ago i ran across this info on the internet. the load is 40.5 grains of IMR-4895 with a Sierra 168 grain bullet, nilitary LC case and a Winchester primer for a 308 Winchester max pressure load of 52,200 CUP and a velocity of 2626 fps. The listed results shows how changing components effects chamber pressure.

    Bullet change - 168 grain (40.5gr IMR-4895 Win LR - LC case)

    Sierra - 52,200 CUP - 2626 fps

    Speer - 51,200 CUP - 2625 fps

    Hornady - 51,200 CUP - 2525 fps

    Nosler - 52,100 CUP - 2524 fps

    Bullet Change = 1,000 CUP - 1 fps


    Primer change - Winchester LR

    Win LR - 52,200 CUP - 2626 fps

    Fed 210M - 51,000 CUP - 2622 fps

    Rem 9 1/2 - 45,500 CUP - 2571 fps

    CCI 200 - 45,500 CUP - 2581 fps

    CCI 250 - 46,100 CUP - 2579 fps

    Primer Change = 6,700 CUP - 45 (or 55) fps


    Case change - Lake City

    LC - 52,200 CUP - 2626 fps

    FC - 44,700 CUP - 2586 fps

    WW - 45,300 CUP - 2580 fps

    RP - 46,400 CUP - 2589 fps

    Case Change = 7,500 CUP - 40 fps

    Combined changes (not tested)

    15,200 CUP - 86 (or 96) fps

    From 52,200 CUP - 2626 fps

    to 37,000 CUP - 2540 (or 2530) fps

    With same powder change of 40.5 of IMR-4895 and 168 grain bullet

  2. #182
    No Hope For Me 1biggun's Avatar
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    I found this article very interesting for both the info on reaching mak pressures of a case as well as the primer piercing issues I have had on my varmit 223.

    James Calhoon Fine Shootin' Bullets Main Page

  3. #183
    Gunco Regular allesennogwat's Avatar
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    Quote Originally Posted by 1biggun View Post
    I found this article very interesting for both the info on reaching mak pressures of a case as well as the primer piercing issues I have had on my varmit 223.

    James Calhoon Fine Shootin' Bullets Main Page

    Yes magnum primers is what Remington calls for in 223. I like James Calhoon's Bluedot powder loads in 223 Remington as the barrel stays cool and the velocity is decent with the lighter weight bullets. There has been some recent cautions against using Bluedot in certain cartridges with certain bullets weights but most are magnum handgun cartridges.

  4. #184
    No Hope For Me 1biggun's Avatar
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    A buddy has one of the 19-223 and it is really tempermental. its not all fun and games to load for one . turning necks and we have hit high pressure for various reason very easly. neet round when its right but so is a 204 Ruger. If I could find primers I might try some of the thicker ones on the list for a little extraa insurance. the times I blow primers are often the sweet spot for accuracy. I cant help but wonder if the large firing pin hole isint part of the equation as there all puplished loads. I get nervious when a puplished loads has proplems. makes me wonder if my gun has a issue in the bullet leade or the throat causing the higher pressure issues.

  5. #185
    Gunco Veteran patjsimpson's Avatar
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    Wow.... I feel a little dizzy after reading this thread. ;-)

  6. #186
    No Hope For Me 1biggun's Avatar
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    here are some recoil rates for various rounds.
    2 Charts showing recoil ratings - Sportsman's Talk

    I found it interesting . I have been planing a possable deer rifle build for my kid to shoot next year in youth hunt were 10 year olds will be allowed to shoot with a adult. Im Leaning toward a 243WIN But the 260 remington or possably a 6.5 grendal are in the running. this will need t be a very light gun and shot froma stand under 100 yards. Any way I found the recoil rates interesting. wonder at what point rivet wear will be a issue?? those Saiga 12G with slugs must take some strain.

    THIS THREAD NEEDS TO BE A STICKY AS WELL AS THE 308 CONVERSION THREAD!! TOOK ME A BIT TO FIND IT.

  7. #187
    No Hope For Me 1biggun's Avatar
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    I wanted to bump this up (im sick of searching for it) and add this link that gives the effects of differant chamber surfaces and the effects on chamber pressure and brass it very interesting and over my head in some areas.

    Rifle Chamber Finish & Friction Effects on Bolt Load and Case Head Thinning Calculations done with LS-DYNA

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