I went out and shot some H1000 today. I have not hit max load yet, but 82.5 grains yields 3180 fps with the 168 gr Berger. I shot a 4 shot group that measured .384 at 100 yards. I will probably stick with this load. There is absolutely no pressure signs,ie....no case head expansion or sticky bolt. Barnes shows 83.5 grains for the 160 grain bullet....so I started at 77 grains and worked my way up. It is getting close to hunting season, so I will probably stay there.
300Win....that is one hell of a charge of 7828 with the Amax. I might have to try that when I rebarrel to 28". Sounds like you are planning to do the same thing as me. I also ordered a McMillan A-5 Stock. After hunting season I will probably have it rebarreled and then start all over again. I think I might go a custom reamer with no freebore. I have to ask Kirby if he has any experience with that. Thanks for the advice and help.
Oh, one other note.......I chrono'd my 7828 loads early in the year when it was down around 45*, they ran 3080-3090fps all day long. Today it was 85* and they ran 3040 fps. The load I was using is 76gr IMR7828 with a 168gr Berger. When I shot the H1000 I was pretty happy that I added another 140 fps. I did shoot the H1000 loads early this morning when it was 55*, so I know that it wasn't a heat factor. I will shoot the load some more, but it is very accurate. Figured I should add that information.
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82.5 grains of H1000 with a 168 grain bullet [img]/ubbthreads/images/graemlins/shocked.gif[/img]
That's a hot load. It HAS to be past max...pressure sign or not.
Was that new brass?
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It is with new Winchester brass. I also shot some with some fired Win brass. It is about 1 grain over max according to Barnes. I measured the cases before and after firing....no change. Primer pockets are still tight. I contacted a Hodgon tech last week and asked him about the load data they had.....I saw where some guys were running 83.5 grains with a 160 grain bullet, he said their data was pretty conservative. They show 80.7 grains H1000 = 51,500psi with a 160gr. The STW max is 65,000 psi. I imagine their are lots of variables between rifles. My rifle has .220" freebore. If the bullets could get to the lands, the 80.7 or less might be the max. I am very cautious when reloading. I have seen bolts come flying out and actions blowup(mainly on a homemade 50 cal by a local smith). In the reading I have done on this forum and others, if there is no case head expansion, the bolt lifts easily, and the primer pockets are tight, you should be ok. I am using Fed 215M primers, which flatten out easily. My minimum loads sometimes flatten them out. I put in some WLRM primers and they looked perfect. They are a little harder from what I have been told.
The Load that 300Win listed above with IMR7828....IMR lists 76.0 grain max with 62,300 psi. I am not sure what a grain increase equates into psi gain. I think it is always best to start below the manufacturers max and work your way up. Every gun will be different. We have a Kimber 300wsm that reaches max before our Shilen barreled 300WSM. It also gets 100fps faster with a 2" shorter barrel and less powder. It comes down to the barrel and chamber.
It is true, Hodgdon does give conservative numbers. Retumbo & H1000 both gave me great accuracy. Almost Identical 1/2 MOA accuracy. I think I'm just a 1/2 MOA shooter. The load and gun are probably better than that.
H1000 gives less pressure and slightly higher velocity than Retumbo.
The H-1000 has been the best powder for me, I quit load development before finding any high pressure signs on the brass (Rem.)or primers, I am past 85 gr. but I am using Molly coated 168gr bullets and they do help with pressure. I have found the rifle shoots best with lots of speed.
Thw STW will does shoot great at high velocity. But, I find that the the 140's in a 9 twist rifle do not group well. I've never shot a 9.5 or 10 twist stw so I can't comment, but the 9 twist with 160+ bullets is does like those max load.