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Thread: Compressed loads

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    Compressed loads

    Working on H1000 load for my 7RemMag and am getting up to 4.4% compression according to Quickload. How much can you compress before you have issues?

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    Re: Compressed loads

    Every rifle is different, but I ran into pressures signs with my 300 wm, 208 grain amax and H1000 before I got to that level of compression.

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    Re: Compressed loads

    I understand the pressure issues I'm wondering about the effects of crunching powder kernals. One of the loads Quickload says should be pressure safe has powder into the case neck and gives a distinct Crunch when seated.

    Just to be clear I'm working up from considerably lower increasing 1% till I hit what Quickload estimates as max.

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    Re: Compressed loads

    Which brass and bullet you running? Have you changed the water volume in quickload? Im running a 162 Amax in RP with 68.5 H1000 3.290 and still have room and no pressure.

    However, I did run into pressure with 160 AB and Norma brass, but was shy of a compressed load. This is out of a Tikka.

    I cant give an answer about how much you can compress, but Im thinking you will hit pressure before you start compressing.
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    Re: Compressed loads

    New Winchester brass 85 grains measured water, 162 Amax, COAL 3.415. Quickload gives a theoretical max of 74.2 H1000 thats well into crunch level.

    I'm starting at 69.3 H1000 which is a known safe load in my rifle

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    Re: Compressed loads

    There are certin powders and bullets that just go crunch when seated. Varget is one in 308 that does this.

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    Re: Compressed loads

    How are you dropping the powder. If not usinga long drop tube then pour the powder slow

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    Re: Compressed loads

    I might not be doing it right but I have never doin quick load to be accurate. Even when I put in new values for the case capacities according to water volume. All my loads are always supposable 'compression' loads but they are actually far from it, u can shake the cartridge and hear it having a lot of room left inside.
    I never hear a crunch though..... So maybe you are compressing your load...

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    Re: Compressed loads

    Compressed loads are pretty normal for many powders. I've found that some loads aren't really "compressed" at all when you use a long "drop tube".

    The use of a tube allows for the powder kernels to build up from the bottom of the cartridge. A load that is "dumped in" may come well up into the neck ares yet the same amount poured in using a drop tube will only come up to the case/shoulder junction.

    I use a piece of 3/8" "Brake Line" about 6" long that I bought from a local Auto Parts Store. I cut one of the flared ends off then epoxied it into a Lee Powder funnel with J-B Weld.

    To drop the powder just put the remaining flared end over the case mouth and hold firmly. Pour the powder in the funnel and proceed.

    This allows me to get uncompressed loads in my .308 cases using 47 grains of RL-17 with a Berger 185 gr Juggernaut. The pressure ring of the bullet is right at the neck/shoulder junction and the powder is right at the 100% fill mark.

    Without the drop tube there would be no room to seat this bullet.
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    Re: Compressed loads

    Well they did turn out safe. Fired them this morning no visable pressure problems and no measurable difference in the web area of the case.

    I was using a drop tube, the Retumbo load I'm looking at for 180's is even more compressed.

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    Re: Compressed loads

    Deadshot, thanks for the info on making a long drop tube.
    BigJohn, I have been using Quick-Load for about a year now, and I always check the data with my Reloading books---I have four current ones, and I use the one for the Bullet Manufacturer that I am currently loading. I have found that Quick-Load tends to call max pressure with lower amounts of most powders before the Book does. I have found times where Quick-Load said max Load when the book said up to 2.5grains more of that powder with that bullet.
    Especially with you not seeing any pressure signs, I'm sure you are fine.
    Anybody else have input on Quick-Load versus the Loading Manuals?
    Cheers,
    Tim

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