i like my 300 RUM.at 1500 yrds,my 220 grn match king is still doing over 1350 fps (theoretically since i have never chronoed that distance).so since subsonic transition is still aways off,this calibre is capable of 1 mile shots.my 700P has 1 in 10 rifleing so i am limited in uber high BC bullets like 220 grn lostriver j40's.i cant speak of throat erosion,having only shot a couple hundred rounds and the recoil doesnt bother me unbraked.all in all i really like this calibre
300 ultramag
- Thread starter milo
- Start date
The US Army AMU never could get the .30-338 to shoot as well as the .300WM
If you want a big boomer, seriously, the .338 Edge/SDM will work great! Like it has been said, don't flute the barrel, extra weight is a good thing, and you lose stiffness.
For a scope, go 8x-32x or 10x-40x What the heck would you ever use 6x for? shots under 50 yards?
If you want a big boomer, seriously, the .338 Edge/SDM will work great! Like it has been said, don't flute the barrel, extra weight is a good thing, and you lose stiffness.
For a scope, go 8x-32x or 10x-40x What the heck would you ever use 6x for? shots under 50 yards?
I agree with the recommendation of the 6.5-284 or the .300 Winchester Magnum. A ballistic equal would be the 6.5-06. All three of these cartridges have made a good showing at the major U.S. long range matches for years. Personally, I don't see the advantage of the Ultramag as a match cartridge. The truth is, at 1000+ yards, you are going to be dialing some major elevation and windage, regardless of what cartridge you choose.
Recently, the Aussies have gone to the straight .284 Winchester with a Sierra 175 MK as their ultra long-range match rifle of choice.
If I had to choose an Ultramag for this kind of shooting, I'd go with the .338 Remington Ultramag. It's very similar to the .338 Lapua -- a proven long-range sniper cartridge. In addition, the .338 Ultra would be somewhat easier on your barrel than the .300 Ultra or the 7mm Ultra.
Recently, the Aussies have gone to the straight .284 Winchester with a Sierra 175 MK as their ultra long-range match rifle of choice.
If I had to choose an Ultramag for this kind of shooting, I'd go with the .338 Remington Ultramag. It's very similar to the .338 Lapua -- a proven long-range sniper cartridge. In addition, the .338 Ultra would be somewhat easier on your barrel than the .300 Ultra or the 7mm Ultra.
- Location
- Hillbilly shack in the boonies
It will cost you to have fun with that gas tank. 
troutseeker
CGN Ultra frequent flyer
- Location
- Prince George, BC
I know from experience that Milo strongly believes in getting big bang for big bucks (I bleie he is the re-incarnation of some Texas gentleman cowboy). The bastard got me addicted to a US company's EXPENSIVE hazelnut latte's... Thank dog for my acide reflux, I am now a recovering java addict, going on 5 days without a cup (can't wait for my next one...).
Hey Milo, my baby moose is some tasty!!! You coming down soon for some beers and a barby?
Troutseeker
Hey Milo, my baby moose is some tasty!!! You coming down soon for some beers and a barby?
Troutseeker
- Location
- behind the grassy knoll
I am not a fan of the RUMs at all, but 1 good thing if 1 must have a barrel burning , powder wasting boomer. Nosler now makes decent brass for the 300.
My biggest complaint about the 300 RUM, other than the lies about velocity and energy Remington and many of the gun magazines called advertising, is the fact that the only brass available was Remington, which is crap on a good day. By the time you sort for weight and find enough that have similar case capacities and neck thickness you have purchased several hundred pcs to get maybe 50 that are close, then the brass prep starts.
Now with decent brass being available, maybe it could be a viable shooter. Personally I have never seen a RUM outshoot a 300 winmag,and it is not for a lack of range attendance.
As for the 7Rum the 7STW is still a far better choice, it is accurate and a more effcient barrel burner, you can usually get at least 1000 rnds before it barrel time, the 7 RUM is considerably less.
KK
My biggest complaint about the 300 RUM, other than the lies about velocity and energy Remington and many of the gun magazines called advertising, is the fact that the only brass available was Remington, which is crap on a good day. By the time you sort for weight and find enough that have similar case capacities and neck thickness you have purchased several hundred pcs to get maybe 50 that are close, then the brass prep starts.
Now with decent brass being available, maybe it could be a viable shooter. Personally I have never seen a RUM outshoot a 300 winmag,and it is not for a lack of range attendance.
As for the 7Rum the 7STW is still a far better choice, it is accurate and a more effcient barrel burner, you can usually get at least 1000 rnds before it barrel time, the 7 RUM is considerably less.
KK
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
Sorry, but gotta step in. Been shooting the 300RUM for quite a while now in a long barrel heavy gun. Rem is just fine and that is what I use. 1/2 MOA out to 1000m with a King barrel and an Enfield P14 action. good enough me thinks.
for those that need 'better', there is Fed and Nosler. There is soon to be some boutique brass out from a US manf. No confirmed delivery times yet.
The RUM is all about horsepower so moving very heavy for calibre bullets make more sense then trying to drive light bullets at super speeds. That is a big reason why printed/factory numbers don't always work in 'real' world shooting.
Some barrels don't like going fast with light bullets so accuracy suffers until the bullets are slowed down. Also, most RUM's are Rem factory rifles. Production bores can be rough enough to slow down bullets. Not necessarily the best pipes either.
Where the RUM really shines is in LR hunting and target rifles launching bullets at least 210gr up to 240gr (Wildcat does have heavier bullets but have not shot them yet). Except for the mondo WBY and equal sized wildcats, other smaller cases just don't have the case capacity to push these heavies up to and over 3000fps.
Barrels up to 40" don't hurt either.
This case can be finicky and being large, harder to tune but is mostly a barrel thing. Of course, it uses up alot of powder for each bang, wears barrels out pretty quickly but like big displacement sports cars, how fast do you want to go?
When a 220 or 240gr MK arrives at 1KM after being launched at 3000fps and faster, it will put a grin on your face that a 'lesser' case and cartridge just can't.
Jerry
for those that need 'better', there is Fed and Nosler. There is soon to be some boutique brass out from a US manf. No confirmed delivery times yet.
The RUM is all about horsepower so moving very heavy for calibre bullets make more sense then trying to drive light bullets at super speeds. That is a big reason why printed/factory numbers don't always work in 'real' world shooting.
Some barrels don't like going fast with light bullets so accuracy suffers until the bullets are slowed down. Also, most RUM's are Rem factory rifles. Production bores can be rough enough to slow down bullets. Not necessarily the best pipes either.
Where the RUM really shines is in LR hunting and target rifles launching bullets at least 210gr up to 240gr (Wildcat does have heavier bullets but have not shot them yet). Except for the mondo WBY and equal sized wildcats, other smaller cases just don't have the case capacity to push these heavies up to and over 3000fps.
Barrels up to 40" don't hurt either.
This case can be finicky and being large, harder to tune but is mostly a barrel thing. Of course, it uses up alot of powder for each bang, wears barrels out pretty quickly but like big displacement sports cars, how fast do you want to go?
When a 220 or 240gr MK arrives at 1KM after being launched at 3000fps and faster, it will put a grin on your face that a 'lesser' case and cartridge just can't.
Jerry
300 ultra mag
milo:
If it's not too late I would like to suggest the 7mmSTW.
You can launch 180 Berger VLDs at 3000+fps which will remain supersonic beyond one mile (1160 fps at 1600m ~ 1750 yds). A 9 inch twist is best. I have a Broughton 5C sporter mag 27 ½ inch bbl on my CSS Abolt and it turns out 1/3 MOA 3 shot groups at 100-600 yds. Recoil is not a problem with a decelerator pad and no muzzle brake. Barrel life is like any hot mag. Below 2000 rds. In my mind 7mm is the best compromise for hitting power at long range without a lot of recoil. smaller 6.5s have less knock down power and bigger 300s too much recoil for me. Don't get me wrong. I own a 300 wea. mag MGA weighing 5 ½ pds + 1 lb scope but it's very loud with the brake.
I get 3200 fps on 180 grainers but the fact that they are fatter won't get them out at 1600m. You have to go 240 or at least 220 with a 300 to get the same ballistics.
Regards.
Sniper767
milo:
If it's not too late I would like to suggest the 7mmSTW.
You can launch 180 Berger VLDs at 3000+fps which will remain supersonic beyond one mile (1160 fps at 1600m ~ 1750 yds). A 9 inch twist is best. I have a Broughton 5C sporter mag 27 ½ inch bbl on my CSS Abolt and it turns out 1/3 MOA 3 shot groups at 100-600 yds. Recoil is not a problem with a decelerator pad and no muzzle brake. Barrel life is like any hot mag. Below 2000 rds. In my mind 7mm is the best compromise for hitting power at long range without a lot of recoil. smaller 6.5s have less knock down power and bigger 300s too much recoil for me. Don't get me wrong. I own a 300 wea. mag MGA weighing 5 ½ pds + 1 lb scope but it's very loud with the brake.
I get 3200 fps on 180 grainers but the fact that they are fatter won't get them out at 1600m. You have to go 240 or at least 220 with a 300 to get the same ballistics.
Regards.
Sniper767
I own a Remington Sendero in 300 RUM and love it. I must admit, I do have a removeable muzzle brake, and with it it is now a pussy cat to shoot.
I agree with 180 grain or larger bullets. Don't bother with anything lighter IMO.
The advertsized velocity is not lie (contrary to what some are saying....one can only assume they speak not from experience). I handloaded 168 TSX to 3450 fps (easy) and currently shoot 180 acubond at 3350-ish fps. I have chronied all these loads. No significant pressure signs either. Oh, and under 1/2 MOA for the 180's with remington brass.
1000 shots then you have to replace the barrel. Boo Hoo !! Don't worry, I believe Krieger/Douglas, Pac-nor, Lilja etc are making more barrels on Monday !
Don't believe the haters. Everyone deserves a powder guzzling big boomer. Smash away at 1000 m +.
I agree with 180 grain or larger bullets. Don't bother with anything lighter IMO.
The advertsized velocity is not lie (contrary to what some are saying....one can only assume they speak not from experience). I handloaded 168 TSX to 3450 fps (easy) and currently shoot 180 acubond at 3350-ish fps. I have chronied all these loads. No significant pressure signs either. Oh, and under 1/2 MOA for the 180's with remington brass.
1000 shots then you have to replace the barrel. Boo Hoo !! Don't worry, I believe Krieger/Douglas, Pac-nor, Lilja etc are making more barrels on Monday !
Don't believe the haters. Everyone deserves a powder guzzling big boomer. Smash away at 1000 m +.
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I shoot a 700P in 300 RUM, the recoil is not that bad really. I have a lightweight 340 Wby that will rattle your teeth harder then the 300 does. - dan
6mm Shooter
CGN Regular
- Location
- White City, SK
I'm building one to shoot Richards 290gr bullets.
You do want to pace yourself with how many rounds you unleash with the 300 RUM, as the barrel does get hot. I start my typical range session with a 17 HMR and then my heavy barrel 6mm Remington out to 400 - 600 m. Then the BIG 300 comes out out to 600-700 m (limit at my range). Between rounds with the "Thunder" I mess around with the 17 and 6mm, or whatever else I brought that day.
If you just sit around waiting for the 300 RUM barrel to cool down (and you will), you will be tempted to shoot without cooling the barrel (and you will), and this can rapidly shorten the barrel life (I have heard of 300 round barrel life when repeatedly firing through hot barrels). If this happens to you, check out http://www.riflebarrels.com/
If you just sit around waiting for the 300 RUM barrel to cool down (and you will), you will be tempted to shoot without cooling the barrel (and you will), and this can rapidly shorten the barrel life (I have heard of 300 round barrel life when repeatedly firing through hot barrels). If this happens to you, check out http://www.riflebarrels.com/
