That is actually called the .300 Davis (40 degrees instead of 35). After Mark Walker (Was in Texas now has moved) made the 7mm Walker, Matt Davis took Mark Walker's design and translated to a .284 necked up to .30 cal. I believe that either Dave KIff or JGS made or makes reamers for it. It does work>>>but has the same velocity issues the .30-06 has. Better than the .308 with Palma brass but not a lot. If you were going to go to a .30 cal, do yourself a favor and either get a new bolt or have a 'smith open the face up on your .473 bolt, and get a .300.. You will like that much, much more.
.300 WSM WOW!
- Thread starter ShootDots
- Start date
Yes, I'd agree 100% with that. I have two Barnard 'P' action based F-Class rifles both originally with 0.473" bolt-faces. One has very happily translated from 308 Win to the straight 284 and I've never regretted the choice.
The other went from 6XC to 284 Shehane - it shot very well, won me a few medals, but didn't provide much more MV than the other 284 in its 'straight' form and I decided 2,830 fps or so with 175/180s was all I needed anyway. So when its barrel was finished I went through all these iterations about possible 30s with a 0.473" case-head and came to the conclusion none were worth pursuing. (30 Cal was important as I own vast numbers of quality mid weight bullets in the calibre, mostly VLDs, that I wanted to use up and frankly there are few buyers these days for 185/190gn examples of this bullet type.) Eventually, a new magnum face bolt body came from New Zealand and the rifle is just finishing its first season as a 300 RSAUM. With hindsight, this was the correct decision on the bolt. I only wonder if the WSM might have been a bit better cartridge choice on the basis of posts in this thread, but the 284 remains my main long-range F rifle and I keep the loads MVs down a bit on the SAUM.
About the only advantage I can see for the WSM over the SAUM is a 35 degree shoulder as opposed to a 30 degree for the SAUM. If you don't mind fireforming, I think (no test or anything) that a .300 SAUM improved would be the equal velocity-wise as the WSM, BUT, in my opinion, have a better case design. I LOVE a straighter case wall with a sharp 40 degree shoulder.
You know with the Barnard you can just have the bolt face opened up and change the extractor?
I run magnaum and 308based cartridges with the same bolt. It’s a 1min job to change the extractor.
Mulligan
Silver $$ Contributor
I have not experienced those issues with my ‘06 IA
CW
I had assumed that, but my gunsmith (who is the UK Barnard importer) disagreed and recommended a new bolt body. I forget the detailed reasons for not simply opening out the bolt now, but he very strongly advised a new body. (Could it be the ejector position? My other F Barnard is non-eject, but this one has it.)
In the event, it wasn't too expensive and I have a 0.473" face body spare should I decide to revert to this size of cartridge or sell the rifle offering the buyer more options.
SHall
Silver $$ Contributor
I have that exact case design up and running as does Alex Wheeler and Tom Mousel testing it. From what I gather our versions are basically the same. Very min. body taper and 40 degree the 300SAUM. It looks like a .30 Mag. version of the 6 BR-AI (BRA). A sweet looking case and yes it chronos right with the WSM with no pressure, and about 3g less powder. Samuel Hall
Have you tried a 7mm version?
would be interesting to see if it can hit that higher 3000+ FPS node reliably with 180’s that just seems to be out of reach reliably with the standard 7mm SAUM case.
Alex Wheeler
Site $$ Sponsor
R.Morehouse
Gold $$ Contributor
Are there accuracy problems inherent to the 300WSM or is all this new development to save 3g of powder to achieve the same ends? Not saying that is a bad thing by any means. Are we looking for the PPC of 30cal at 1K chambering?.....I always thought the 300WSM kind of fit that bill......Maybe until now.....Time will tell..
Regards
Rick
Regards
Rick
I reckon 'no'. Rather it's precision shooters are inveterate experimenters and always in search of that teensy weensy better mousetrap in wherever their interests lie. After all, the PPCs are the classic examples of what skilled non-industry experimenters can do - no big military project with government funding, no mainstream ammunition manufacturers development programmes. Just two very keen and knowledgeable guys who found an interesting little-known case, reckoned it had possibilities, and invested their own time, range testing, money and gunsmithing expertise to produce something that is still unbeatable a half century on.
Who knows? The 6.5X55BJ, modified 300 SAUM or something we've yet to hear of may be taking all the 1,000 yard BR records in 10 years time.
There is absolutely nothing wrong with the .300WSM.. I have 2 of them... There is nothing wrong with a 7mm SAUM, I had 2 of those!... But attempting to make a better case design can sometimes pay off handsomely! As Laurie stated above, look at the PPC.. Or in another case, look at the Dasher! I think that the Sherman Short cartridges will take off before too long, especially for hunting and steel shooting. Whether or not they make inroads into F-Class is anyone's guess, however, they could excel there too! I am all for "tinkering" to see if they can come up with a better case design or bullet design. I can guarantee you some REAL thought and extensive testing went into Litz's "Hybrid" design! I am all for continuing to pursue something better!Are there accuracy problems inherent to the 300WSM or is all this new development to save 3g of powder to achieve the same ends? Not saying that is a bad thing by any means. Are we looking for the PPC of 30cal at 1K chambering?.....I always thought the 300WSM kind of fit that bill......Maybe until now.....Time will tell..
Regards
Rick
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Thats got to be a new BULLET
tom
Gold $$ Contributor
Rick,
It just happened to have been an option at a time I was up for trying a heavy gun for my third try.... lol, nothing more until it doesn't wind up GONE like my prior TWO
Now that being said, I'm pretty sure the ppc guys would spend the cash for the 12 extra grains and shoot 243s if they could win.
Tom
R.Morehouse
Gold $$ Contributor
Being pretty much a ppc guy these days ( 2-LV & a rail ) I completely agree with your statement. Also have a beautiful 300WSM in an MPA Hybrid stock with the weight system and a detachable 3" piece for the Lenzi to play with everywhere else......Looking very forward to seeing what you & Roy come up with by the end of the 2020 season for me to launch out of it.......Rick,
It just happened to have been an option at a time I was up for trying a heavy gun for my third try.... lol, nothing more until it doesn't wind up GONE like my prior TWO
Now that being said, I'm pretty sure the ppc guys would spend the cash for the 12 extra grains and shoot 243s if they could win.
Tom
.........Happy ShootingRegards
Rick
Ben
Isn’t this the same as Bryan Blake’s 300 and 7 BBM?
I really don't know Doug...
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