geargrinder
Member
The 9" twist will stabilize the 195g bullet in most hunting situations. There's a stability calculator on Berger's website if you want to check it for your specific hunting scenarios.
Berger 7mm 195gr Extreme Outer Limits Elite Hunter Bullet (G1=0.754)
- Thread starter Umpqua Hunter
- Start date
So I have a parts list put together for a rifle build. The two pieces I am still chewing on are the barrel contour and magazine length.
I am looking at a Bartlein barrel in one of the following:
"3" Heavy Sporter (0.670" diameter muzzle, 3.5 pounds) (like Kreiger #4 Heavy Sporter)
"3B" Light Bull Sporter (0.700" diameter muzzle, 4.0 pounds) (like Kreiger #5 Bull Sporter)
"4" Bull Sporter (0.750" diameter muzzle, 4.5 pounds) (like Kreiger #6 Heavy Bull Sporter)
"10" Light Palma (0.750" diameter muzzle, 4.1 pounds after cutting to 26") (like Kreiger #16 Light Palma)
I'd like to keep the rifle as light as possible without sacrificing follow-up shot accuracy in a hunting scenario (potential 3 to 5 shot string). I am leaning to the Light Palma since it is nearly identical weight as the "3B" Light Bull Sporter and yet has the diameter of the next heavier sporter profile. I would like that weight savings but don't want to make compromises on performance.
In the following link, Len Backus uses a #4 Brux which is the same as the "3" Bartlein (0.670" muzzle). It would save me about 10 ounces versus the Light Palma.
http://www.longrangehunting.com/rifles/lrr-28-nosler.php
As far as magazine length, I am calculating that the 28 Nosler would have a COAL of 3.712" if the 195 grain bullet was seated so the bottom of the bullet bearing surface was the same as the bottom of the case shoulder. I don't think I want to go quite that long since I don't want the throat too long for shooting other bullets, so likely the COAL will be closer to 3.50"" to 3.60" which will feed from a standard length magazine (3.7" inside). One thing I have thought about is having the ejection port extended (0.418"), so it is an easy rechamber to a longer cartridge at some point in time without affecting the cosmetics of the action. The longer port will also lighten the action a tiny bit. I don't see any downsides. Do you guys have any concerns on the longer ejection port?
I am looking at a Bartlein barrel in one of the following:
"3" Heavy Sporter (0.670" diameter muzzle, 3.5 pounds) (like Kreiger #4 Heavy Sporter)
"3B" Light Bull Sporter (0.700" diameter muzzle, 4.0 pounds) (like Kreiger #5 Bull Sporter)
"4" Bull Sporter (0.750" diameter muzzle, 4.5 pounds) (like Kreiger #6 Heavy Bull Sporter)
"10" Light Palma (0.750" diameter muzzle, 4.1 pounds after cutting to 26") (like Kreiger #16 Light Palma)
I'd like to keep the rifle as light as possible without sacrificing follow-up shot accuracy in a hunting scenario (potential 3 to 5 shot string). I am leaning to the Light Palma since it is nearly identical weight as the "3B" Light Bull Sporter and yet has the diameter of the next heavier sporter profile. I would like that weight savings but don't want to make compromises on performance.
In the following link, Len Backus uses a #4 Brux which is the same as the "3" Bartlein (0.670" muzzle). It would save me about 10 ounces versus the Light Palma.
http://www.longrangehunting.com/rifles/lrr-28-nosler.php
As far as magazine length, I am calculating that the 28 Nosler would have a COAL of 3.712" if the 195 grain bullet was seated so the bottom of the bullet bearing surface was the same as the bottom of the case shoulder. I don't think I want to go quite that long since I don't want the throat too long for shooting other bullets, so likely the COAL will be closer to 3.50"" to 3.60" which will feed from a standard length magazine (3.7" inside). One thing I have thought about is having the ejection port extended (0.418"), so it is an easy rechamber to a longer cartridge at some point in time without affecting the cosmetics of the action. The longer port will also lighten the action a tiny bit. I don't see any downsides. Do you guys have any concerns on the longer ejection port?
I got talked into a #5 Brux for my 280, I actually believe I'd have been fine with a #3 for hunting. I did a 7 shot string in a 600 yard match, 5-10 seconds between shots, it held its group fine. They were moderatly hot loads for a 280. A barrel contour like a #4 Brux/#3 Bartlein, in the 28, should work just fine for 3-5 shots. If I recall, WB has a #5 Brux on his 7 STW, so hopefully he'll weigh in. My guess is the noise alone will freeze any game, if you brake it, meaning two shots will be plenty...lol.
Re: the longer rejection port, if the manufacturer/gunny say fine, I say fine... I doubt .418 will reduce stiffness enough to worry about, but no expert on the engineering stuff.
Re: the longer rejection port, if the manufacturer/gunny say fine, I say fine... I doubt .418 will reduce stiffness enough to worry about, but no expert on the engineering stuff.
just a heads up. I ordered a #3 bartlein for my 280 and it surprised how much bigger it was than my # 4 pac-nor. bartleins tend to run a bit bigger than a lot of others contours. for my build I chose to switch it out. the balance didn't feel good anymore. but it did shoot very well!
WapitiBob
Veteran member
Yes I have a #5 Brux. I wanted a 5 1/2 but they didn't have one. My gun is up to about 13# now so weight savings hasn't been in the forefront evidently.
Bullet bearing surface at the neck/shoulder jct or shoulder/case body junction?
Bullet bearing surface at the neck/shoulder jct or shoulder/case body junction?
So I think the comments just confirmed that my choice is down to one of the two Bartlein barrels, weight is almost the same:
"3B" Light Bull Sporter (0.700" diameter muzzle, 4.0 pounds) (like Kreiger/Brux #5)
Light Palma (0.750" diameter muzzle, 4.1 pounds after cutting to 26")
One school of thought would say the heavier muzzle is better. The other is to instead use the weight to stiffen the area near the receiver with a slightly smaller muzzle. When it comes to dampening vibration, I would think the latter could possibly be better and shifting the weight to the end of the barrel would accentuate vibrations. At this point it may just be splitting hairs.
Then again the Light Palma is a 31" blank so I could go with a 28" barrel if my heart so desired.
"3B" Light Bull Sporter (0.700" diameter muzzle, 4.0 pounds) (like Kreiger/Brux #5)
Light Palma (0.750" diameter muzzle, 4.1 pounds after cutting to 26")
One school of thought would say the heavier muzzle is better. The other is to instead use the weight to stiffen the area near the receiver with a slightly smaller muzzle. When it comes to dampening vibration, I would think the latter could possibly be better and shifting the weight to the end of the barrel would accentuate vibrations. At this point it may just be splitting hairs.
Then again the Light Palma is a 31" blank so I could go with a 28" barrel if my heart so desired.
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Elkhunter96
Active Member
I have a heavy bartlien on my 6.5 x 284. Its a sweet shooting rifle, but not the lightest to pack around. The guy I had build it off a Winchester model 70 donor gun recommended it for its accuracy and he wasn't lying. I cant remember exactly which barrel I picked, I would have to check my records.
I'm interested in the 28 Nosler and your project, it sounds very interesting...
I'm interested in the 28 Nosler and your project, it sounds very interesting...
brdhuntr
Member
I shot my 28 Nosler rifle yesterday and was very happy with .50-.75 inch grouping with 175 Nosler accubond factory shells, with Vortex 16x24x50 viper. Can't wait to try some long range shots..
Brdhuntr, very cool! Do you know what contour your barrel is? If not what's the muzzle diameter?
WB, a COAL where the top of the boat tail (where the bearing surface of the bullet begins) is seated to the bottom of the case shoulder. That would be the max length where the case shoulder is fully in contact with the bearing surface of the bullet.
I'm sure one could seat it longer they desired.
For future reference.....
Gunwerks states they use a "3G" barrel contour in the specs of their their LR1000 rifle which has a 0.650" muzzle diameter. The LR1000 that is their "1000 yard functional range" can be ordered in the 28 Nosler as well as other magnums (300 RUM, 30 Nosler, etc).
I also found a post where Aaron Davidson from Gunwerks answered a question on their barrel contour (see post #2):
http://www.longrangehunting.com/forums/f19/gunwerks-lr1000-barrel-50880/
"The countour is right in the 4.1 to 5 contour. We finish .670 at the muzzle (25.5 inches) with about an inch of shank infront of the recoil lug."
So it sounds like the LR1000 barrel is similar to the #3 Bartlein Heavy Sporter (like Kreiger #4 / Brux #4) which is 0.670" at the muzzle.
Gunwerks "Magnus" rifle, "1300 yard functional range" uses a barrel with a 0.750" diameter muzzle.
Gunwerks states they use a "3G" barrel contour in the specs of their their LR1000 rifle which has a 0.650" muzzle diameter. The LR1000 that is their "1000 yard functional range" can be ordered in the 28 Nosler as well as other magnums (300 RUM, 30 Nosler, etc).
I also found a post where Aaron Davidson from Gunwerks answered a question on their barrel contour (see post #2):
http://www.longrangehunting.com/forums/f19/gunwerks-lr1000-barrel-50880/
"The countour is right in the 4.1 to 5 contour. We finish .670 at the muzzle (25.5 inches) with about an inch of shank infront of the recoil lug."
So it sounds like the LR1000 barrel is similar to the #3 Bartlein Heavy Sporter (like Kreiger #4 / Brux #4) which is 0.670" at the muzzle.
Gunwerks "Magnus" rifle, "1300 yard functional range" uses a barrel with a 0.750" diameter muzzle.
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brdhuntr
Member
I can tell you it is a Patriot model 48, with a brake,and 2.10 trigger.1 in 9 twist.Not sure on the diameter. I'm kind of a novice to this new tech. stuff. I haven't bought a new rifle for 35 years,having shot a Ruger 300 win.and wanted to try something new. My son in law is really into all the new gadgets,and built a 7 mag. last year ,and now we can have fun during the off season.