I almost went with 7mm RSAUM. It's a fantastic cartridge. If I were building a short action this would probably be my choice.
7mm, something in-between WSM and 28 Nosler
- Thread starter kevwil
- Start date
I almost went with 7mm RSAUM. It's a fantastic cartridge. If I were building a short action this would probably be my choice.
7mm Practical is a great performer, but I'm choosing to stay away from belted cases and fire-forming.
Interesting. My book showed 74 grains, and my estimates put it well under 3k fps for the Berger 195. If I were going with a short action I would probably reconsider, but this is for a long action.
LOL Not looking to create my own cartridge, but yeah that would be an expensive endeavor.
Gunwerks replied to me, reamers are available and some smiths already have them. This might be what I'm looking for.
Kurz
Silver $$ Contributor
Very interesting.
I've been reloading both cases, 7WSM and 7SAUM for several years now and the figure I used seems correct.
I reviewed several sources to see if I had misread or misinterpreted the information but I find that my statement is in truth still valid. There is a stated range for total capacity when filled with water based on the manufacturers, that range being 81.3 grains to 82.2 grains. This holds true for the WSM family in general.
The RSAUM family though is stated as being in the approximate range of 71.5 to 73 grains again depending on the manufacturer.
Regards.
I just read this whole thread and didn't see anywhere what this rifle is to be used for. Sometimes that helps responses. I would never build a 7 RSAUM OR 7WSM in a short action. Things function better and getting a loaded round out is much easier on a long. Then you have the ability to throat out where needed and still fit in a magazine if it's not a single shot. Matt
AckleymanII
Gold $$ Contributor
I have never understood this. I have been shooting belted magnums since 1978 and I have never, never had one issue, Remingtons and many customs using Remington brass and Winchester.
If you put a 180 grain Berger Hybrid seated with only the boat tail below the start of the neck, the OAL will be over 3". Perhaps a long action is the right choice for the cartridge. I am currently using a long action Remington to chamber a 6.5 Remington Magnum. That was designed (mal designed if the truth be known) as a short action cartridge, but it really needs a long action. I'm expecting overall lengths up to around 3.3" in what was claimed to be a short action cartridge.
I'm a little jittery when taking H2O weights, but I get 75.71 grains for the straight 7mm RSAUM? And, when Ackleyized: 76.87 grains?
Relative to "sourcing brass", my favorite old indian trick is to take Norma .300 WSM brass and shove the shoulder back to approximate 7mm RSAUM case capacity...a lot of work here...and "improve" it to 40 degrees. H2O comes in at just 75.24 grains, but with the long residual case neck (180 Hybrid all inside the neck), it shoots faster with less powder than the standard 7mm RSAUM, and just as accurately. COAL comes in at 3.24 inches, so you will need at least a 32-inch barrel to keep the bullet tip from protruding out the muzzle!!
Dan
I built my 7RSAUM on a long action and have no regrets.
My Norma brass is 71.1 grains just to confirm your data.
Looking to step down from 338 Lapua to something more reasonable. Very long range target shooting, 1500-2500 yards. Looking to send heavy bullets faster than 3000fps without burning out a barrel in 800 rounds. Magazine feed is not a requirement, but repeater actions have a wider variety of stock choices. Looking at 7mm for reduced recoil compared to, for example, a 300 Norma Mag with 230gr Berger Hybrids. Want something that will work in a standard long action without requiring a special "magnum" action like 338LM does.
My apologies, I must have been looking at the wrong cartridge.
The 28 Coaster should push Berger 195 VLD at 3000fps from a 26" barrel. If you are shooting at the 1500+ yard range you will probably have an even longer barrel.
If you want something off the shelf the 7mm SAUM is the best at the moment. As far as I can tell, same pressure, same seating depth, same barrel, it will throw that same 195 pill at ~2750fps
The 28 Coaster is exactly what you asked for. Half way between a WSM/SAUM and a Nosler. Easy to make brass from any Nosler or RUM brass.
The WSM/SAUM will use ~62 grains of RL-26 to go 2750
The 28-Nosler will use ~91 of RL-33 to go 3100
The 28 Coaster will use ~83 of RL-33 to go 3000
As close to the middle as you can get.
The design is free to use. Maybe I'll make one with my Proof Research barrel instead of another 28-Nosler. That would be a 24" hunter though, so I'd be throwing Barnes 168 LRX at about 3050fps.
Unless, you are not interested in wildcats.
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