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can anyone give me some loads for this combo. How many grains and what velocities.. I am looking to reach 3200fps but hodgdon says 80.7 is the max but the velocity is only 3084.. are they being conservitive or is the pressure to high? any help would be appreciated.. thanks | ||
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One of Us |
WOW!!! thats it? I get a 5 shot ave of 3091.6 fps for a 7mmRM 160gr.Accubond over 72grs. of H1000 Live Your Dreams | |||
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one of us |
You stand a much better chance of attaining that velocity with either Retumbo or Ramshot Magnum. I couldn't do it with H1000 but got there with Retumbo. Best accuracy was with Magnum where we got ½ MOA pretty consistently using 83g. Retumbo topped out at 82g with not nearly as good SD's and the groups weren't consistent nor as good. | |||
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quote: You can be pretty sure that your pressures are below those of the poster below. quote: | |||
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Dartfreak8, First, lets look at some of the other manual's maximum loads: Nosler #4.........160 gr bt...78 gr H1000....3080 fps Sierra #5.........160 gr SBT..79 gr H1000....3100 fps Hornady #6........162 gr BTSP..78.2 gr H1000....3150 fps Nosler lists their fastest load as 3184 fps using 89 gr of AA8700. Sierra lists their fastest load as 3250 fps using 78.5 gr of RL25 or 88.4 gr of H870 Hornady lists their fastest load as 3150 fps using RL 19, H4831, WMR, H1000, or AA8700 Sierra shows RL25 able to deliver 150 fps more than H1000, while Hornady shows H1000 to have the edge by 50 fps, and Nosler shows RL22 able to deliver 40 fps more than H1000. Are you as confused as I am now? Now, let me tell you about my own experiences with this cartridge and 160 gr bullet weights, understand that any loads I refer to are using either the 160 Sierra SBT or the 162 Hornady BTSP. Also, remember that my particular loads may not be safe in your rifle. They shot considerably faster and showed traditional signs of excessive pressure when fired in my cousin's Rem Sendero. My loads were worked up in my Ruger #1 single shot with a 26 inch barrel. I am now using a load of 82 gr H1000 and reaching a velocity of 3185 fps. and acheiving extremely good accuracy for a hunting weight rifle and a magnum cartridge. In the past I have experimented with up to 86 gr of H1000 and gotten 3300 fps, velocity variation increased and accuracy dropped off at this level. I have also gotten 3200 to 3282 fps from my rifle using 84 gr of RL25, but velocities were somewhat random. And I have experimented with H870. My Ruger required 98 gr of H870 to reach 3250 fps with the Sierra 160 gr bullet. That is ten grains over the suggested max load from the Sierra manual. Standard deviation for this load was not too bad, but felt recoil was subsantially greater than the loads with H1000 at the same velocity. You could very well acheive 3200 fps with your rifle by carefully increasing your load one or one half grain at a time, but remember that the traditional signs of high pressure are notoriously random and sometimes unpredictable. One can easily subject a rifle to pressures in the range of 70,000 to 75,000 psi before seeing these signs. I do not yet have a pressure trace system, so I must rely on the appearance of my brass and primer as well as Chrono readings to guess pressure levels. Another tool which I find useful is the graphing of charge weight versus velocity readings. At the point which this graph becomes nonlinear, I know that the chamber pressure is becoming unpredictable. I would also reccomend you give RL25 a try in your rifle. It might be the perfect powder for you. Idaho Shooter | |||
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stubblejumper The pressures were getting to the edge with that load as I had 1 hard bolt lift on the last shot with that load.so I backed off a couple grs. It just strikes me as odd the original poster can't get that with 10 more grs. of H1000 in a 7mmSTW Live Your Dreams | |||
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one of us |
quote: If the bolt lift was hard ,they were over the edge. | |||
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One of Us |
Stubble I seriously doubt it as it was barly decernible.But then coming from such a blow up your rifle expert such as yourself maybe your on to something.LMAO Live Your Dreams | |||
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one of us |
I shot the same combo you are referring to yesterday in my STW and extreamely happy. What was strange is I have never had this happen to me. Every combo was almost exactly the same groups in my Sako75. I shot 74gr, 76gr and 78gr H1000. I didn't chrono graph, but all groups were around .8MOA. Usually, usually, I see groups fall off somewhere at the high end. One of my three 78gr groups were 1.3MOA, but the other two were just under 1MOA. I guess I will sneak on up to 80gr and check it out. First time with H1000 I get great groups at high pressure loads. I seriously doubt I was kicking at 3200fps. I bet I was around 3050fps as nosler suggests. As for the guy gettting 3200fps with a RM. Wow. Thats pretty incredible. First time I ahve seen that with that load. | |||
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quote: What do you base your comment on?I have never had any type of rifle or case failure of any kind.If I detect any sign of pressure at all ,I back off two grains immediately because I realize that I have already exceeded the desired pressure.The velocities that I produce with my rifles are actually quite similar to those of many other people. | |||
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One of Us |
Oooooooops must have gotten you confused with the guy who blew his rifle awhile back! Sorry I must be mistaken.My appologies! Yes I backed off right there and then.The lift seemed slightly harder than the first 4 shots but no other pressure signs.The first 4 shots there were no pressure signs whatsoever.But on that 5th shot I thought the bolt lifted harder. Reguardless wether it did or was only my imagination I immediately stopped right there and then. Ended up settling on a charge of 68.5grs of H1000 which shot .680 5 shot group at 100yds. chrono'd at 2960fps. Been happy with this load.not the fastest of loads but it shot so well I've stuck with it. Live Your Dreams | |||
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H-1000 From 71.0 grains to 81.5 grains Federal 215 Primer But I preferred: H-870 From 79.8 grains to 92.5 grains Federal 215 Primer | |||
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one of us |
well if you're getting pressure signs @ 68 grs. H1000/160 gr. in an STW there might be something wrong with your chamber. Most 7mm Rem Mags can digest 69-70 grs. H1000 with 160-162 gr. bullets and as we all know, the STW has more case capacity and should be able to handle more powder... | |||
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