Let us know what you settle on. I have a Ruger 77 in 7MM and have found nothing that it likes yet in factory ammo. Chamber, bore and crown are in excellent shape, resigned to having to reload for an acceptable hunting round. I had heard 7MM's were on the finicky side and my rifle seems to be the poster-child for that sentiment.
Pissed off about 7mm RM load data
- Thread starter g-manz35
- Start date
Let us know what you settle on. I have a Ruger 77 in 7MM and have found nothing that it likes yet in factory ammo. Chamber, bore and crown are in excellent shape, resigned to having to reload for an acceptable hunting round. I had heard 7MM's were on the finicky side and my rifle seems to be the poster-child for that sentiment.
I have reloaded 7mm rem in Sakos, Tikkas, Styers, Savages with consistant predictable results and great velocity. Love the 7. The .300wsm on the otherhand has been a huge pain to reload for with pressure coming on very fast, steep shoulders that constantly cause headspace issues when resizing and chambering, worst of all accuracy that falls below factory loads in most cases. Just my experience in case anyone thinks dumping a 7 in favor of a .300wsm, I wouldn't.
07blackwater
CGN Ultra frequent flyer
- Location
- Port Coquitlam, BC
I'm having fun with a 1954 vintage .270 with a pitted barrel right now. The 7mm was fairly easy, in comparison, I'd say.
IMR 7828ssc is pretty consistent and forgiving, give it a try. I said earlier I got very good velocities with IMR 4831 but I burned a pound finding a good load.
7828 is the powder for the 7mm mag IMHO. I was VERY surprised by the accuracy with it in my rifle.
IMR 7828ssc is pretty consistent and forgiving, give it a try. I said earlier I got very good velocities with IMR 4831 but I burned a pound finding a good load.
7828 is the powder for the 7mm mag IMHO. I was VERY surprised by the accuracy with it in my rifle.
I've read the Speer comments, it should be printed and sent out with every set of 7mm reloading dies. When data is developed in a pressure barrel and the final published pressures are lower than Saami spec its because they had to quit, not because they wanted to. There's complicated formula that's used, but translated to English it means that they quit when all of the test loads are under, not most of them.
The 7mm is basically a .264 Win that got necked up 1/2 mm; so Remington took a 6.5 that usually never made speed and made it into a 7mm that doesn't make speed. An STW it ain't; and in some sad cases it isn't even a 30-06.
07blackwater
CGN Ultra frequent flyer
- Location
- Port Coquitlam, BC
Just to be sure of what it means, you're saying tests loads of the same charge weight without pressure spikes?
I've looked at former edition reloading manuals compared to newer ones. There is in many cases a HUGE variance in many max loads - 3 to 6 grains variance between old and new editions. The older manuals showing more generous max loads. Sure makes you want to scratch your head! As always, start low and work up!
Maybe I wasn't that clear. I'll try again with a made up, and slightly oversimplified example that might help.
Say the Saami spec is 65,000 PSI on a cartridge, but the pressure that was published was "only" 58,000 PSI on a certain load. That doesn't mean they wimped out, it means that the hottest shell in the test sample hit maximum or as close as a complicated statistical analysis would allow . The 58,000 PSI is the average of all of them.
The more consistent the pressure of a load is, the closer they can push the limits.
07blackwater
CGN Ultra frequent flyer
- Location
- Port Coquitlam, BC
Ok,that makes sense to me. Thanks.
