Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Has anyone reached the 3200 fps mark with 220-230gr bullets in the 300 Norma/IMP?
Has anyone reached the 3200 fps mark with 220-230gr bullets in the 300 Norma/IMP?
Gre-Tan built 300 norma, 388 yards @30degs could not be happier. Brooks Range last week.
Mored tails on the rifle...? Barrel length? Action specs?
Bat integrated pic rail HR action, Bartlein 1:10 @20", Mcmillan stock, US Optics 6x fixed, MOA reticle. 200 grain Barnes LRX, 88 grains of H1000. Greg Tannel's love.
There isn't enough case capacity there without a hybrid throat like what Defensive Edge is using in their +P. You can do it with a 30-338 Lapua Imp fairly easily using a longer barrel.
Are you happy with your choice of barrel length? That sounds great (handy, lighter, etc.) Velocity is still good? How's the blast/recoil?
Nice thread. I have just ordered a 300 norma mag build here in Sweden. It's gonna be a Surgeon XL with a krieger 1:9 700mm barrel. Stock is Terry Cross and i'm gonna top that with a Kahles k624i MSR. So it's basicly a longsword but put together here in sweden. I have been planing on running 230's hybrids and probably vv n-570. It's gonna be sweet when I pick it up.
I got 3075fps with R-33 and a 230 Berger in a 30" Bartlein 4 groove. I'm pretty sure my barrel is slow or so it seems to me. My improved version is 110.3 grains if I remember right and a standard is 103.5. I would think I'd see more velocity then that seeing as how guys are getting near 3k out of a standard and a shorter barrel.
I have another 30" Bartlein 5R Sendero barrel lying around that I might do another one with to compare the velocity. I might even order a stepped throater to see what is possibly for velocity. I think 3150 to 3200fps is possible that way but you will give up some barrel life.
I also have a 33" Bartlein 5R Heavy Palma I'm going to build a 30-338 Lapua Imp on, when I get my reamer in the next week or two, to see what is possible with the 230's. I'm shooting for 3400fps and I think that is fairly reasonable since I know others are getting 3150fps in a 26" barrel and 3225fps in a 28" barrel. If the gain stays consistent for the next 5" I'd be at 3412fps in a 33" barrel. With that case capacity I'd expect it to stay fairly consistent to 33".
eI got 3075fps with R-33 and a 230 Berger in a 30" Bartlein 4 groove. I'm pretty sure my barrel is slow or so it seems to me. My improved version is 110.3 grains if I remember right and a standard is 103.5. I would think I'd see more velocity then that seeing as how guys are getting near 3k out of a standard and a shorter barrel.
I have another 30" Bartlein 5R Sendero barrel lying around that I might do another one with to compare the velocity. I might even order a stepped throater to see what is possibly for velocity. I think 3150 to 3200fps is possible that way but you will give up some barrel life.
I also have a 33" Bartlein 5R Heavy Palma I'm going to build a 30-338 Lapua Imp on, when I get my reamer in the next week or two, to see what is possible with the 230's. I'm shooting for 3400fps and I think that is fairly reasonable since I know others are getting 3150fps in a 26" barrel and 3225fps in a 28" barrel. If the gain stays consistent for the next 5" I'd be at 3412fps in a 33" barrel. With that case capacity I'd expect it to stay fairly consistent to 33".
You'd probably gain 30-35fps/inch up to 32-33" and then it would probably drop off a bit after that. 33" would most likely get you 90-100fps over a 30" barrel.
I'll have a better idea about fps and barrel length after I get my 30-338 Lapua Imp. done as I know what others are getting with slower barrels.
Thanks
Should be very close to 3200 fps with 230 berger in your 300 N Imp and 33-34" barrel
I just ordered a reamer very close to yours.35 degree shoulder, same throat but just a little more bodytaper. Also ordered a 34" Krieger 1-9 barrel blank.
Is your's done Bjay? Accuracy and speed?
Nathan reamers is 235 mine is 256 on our 300nm imp 35* i think 235 is more for 215gr..my smith started on it just dont kow which reamer to use
My throat is .235" but it was set up to be between the 215's and 230's so I could shoot either if one or the other didn't shoot. Bjay's would be better for shooting straight 230's but .021" isn't much. My shoulder dimension is straight from a 338 Norma.
Bjay and I both got our dies. I also got my 30-338 Lapua Imp chambered last Sunday and fireformed 10 rounds today. I really don't want to waste much barrel life fireforming so I'll probably only do 20 rounds to see if it shoots and then rechamber a Remington factory barrel to form brass in if it shoots. When I get me reamer back from Bjay's smith I'll do the same for my Norma Imp. I found some other brass to use in my Norma Imp that will require neck turning and fireforming but should last a good long time. BTW my Lapua Imp is .572 at the shoulder.
Here is a picture of my 30-338 Norma Imp versus my 30-338 Lapua Imp. Both have 35 degree shoulders and roughly the same taper. The Lapua Imp holds 122.7grs of water and the Norma Imp. holds 110.3.
my current 300NM load data
barrel 26' 1:9
powder H1000 @ 85.5 gn
Bullet berg 230 target .005" off lands
speed FPS AV 2959
100m target group .2 moa x 5 shotgroup
weather dry light winds temp 22c
Figured I might have slightly better luck w/ this request posting here to get a targeted audience ... does anyone have two pieces of fired (and not resized) 300 NM brass (don't care if primer pockets are blown out) that someone is willing to ship me so I can have Hornady make a modified case for me? Send me a PM. Thx.
The 1-9 will work, I am using a 1-10 and it's awesome at both ELR Distances and short ranges (100 yard zero shoots 1/4MOA)
Don't fall for the trap and going faster than 1-9...
Using the numbers above; 230 Hybrid @ 2,950 fps (sea level & 60F) in a 10 twist barrel has a stability factor of 1.39, which is marginally stable. Kick the altitude to 3,000, and it goes up to 1.55, which would explain good results west of the Mississippi.
If you go with a 9 twist (sea level & 60F), the stability factor jumps up 1.71 which is well into optimal.
Big takeaway from the AB crew having shot the King of the 2 Mile, optimal/max stability is huge when it comes to ELR/Transonic performance.