I’m going with a proof CF Sendero in either 24” or 26” for my build. If I am going to shoot suppressed, should I go with 24” ? Or just stick with the standard 26”. Not sure what velocity loss I would see..
What is the max COAL for anyone using Berger 245 EOLs?
I’m considering using the Hawkins Hunter mags that provide a max COAL of 3.770. I’m just not sure if this is enough or if I should stick to a CIP AICS 3.85 length.
I currently only have 220 ELD-X. But I’m looking to use the best 1000+ yard hunting bullet.
I’m considering using the Hawkins Hunter mags that provide a max COAL of 3.770. I’m just not sure if this is enough or if I should stick to a CIP AICS 3.85 length.
I currently only have 220 ELD-X. But I’m looking to use the best 1000+ yard hunting bullet.
That really depends on how your chamber is cut and where the bullet likes to be seated in relation to the lands. I'm using MDT mags and my C.O.AL with that bullet is roughly 3.75. My chamber was cut to shoot that bullet and the 250 A-tip at mag length.
The Freebore will be .190. So I think 3.77 should be fine? (2.492” case length + .190” freebore + .833” ogive to tip).
Call me out if I’m wrong on my math please.
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Also, does anyone have the bullet dimensions for the 220 ELD-X? Hornady doesn’t seem to publish it like Berger.
Length is 1.63”.
Need Base to Ogive.
Length is 1.63”.
Need Base to Ogive.
Per Hornady it's .855 but I'm not sure how much I trust that measurement as they also said o.a.l. is 1.53 and JBM states it as 1.63. Someone is going to need to take an actual measurement and I don't have any on hand.
Thanks. I haven’t had the barrel reamed yet. The gunsmith just said freebore on his reamer was .190.
If I want to shoot, 245 EOLs, what is the ideal freebore?
If I want to shoot, 245 EOLs, what is the ideal freebore?
I’ll admit—I don’t know how to read freebore from the SAAMI sheet.
Also, I don’t necessarily need to be within SAAMI though.
Can’t find brass anywhere—sifting through the bargain bin at Bruno’s, found a bag of 20 primed Norma. They guy behind me wanted them to take the primers!
I have 50 once fired Peterson cases including 6 loaded rds with the 250 A-tip and N570 at 3.725 c.o.a.l. I only use Lapua cases now to keep things consistent. PM me if you're interested.
Well should just shoot a 300prc st that point. Guess I’ll hold out for something that will work
Hey guys, I couldn't find anyone posting info on shorter barrel magnums. So here you go! Shooting a 22 in barrel out of a srs A2. Using Lapua brass and retumbo and a 220 grain sierra. I can get to 3000 fps at 85.8 grains. But the brass is not happy. Probably only 3-5 firings.
Backed out down to 83.3 hitting 2890 with an SD of 4 and shoots .25 groups all day. I will say without a good break, I will not shoot it. Breaks are needed for this little guy.
Backed out down to 83.3 hitting 2890 with an SD of 4 and shoots .25 groups all day. I will say without a good break, I will not shoot it. Breaks are needed for this little guy.
I am sure this has been asked before, but I can’t find definitive answers. Has the 250 A-Tip been proven reliable for hunting? Being that Hornady bullets are a lot more prevalent than Beger hunting rounds right now—would be great to be able to use these to take Elk at 1000yds+.
Hi chaps, new member here. I found this thread really awesome, so thanks to everyone for their input.
I have a question to ask, has anyone got data on a 30’’ barrel in 300NM?
If I could be fussy, then I would be asking specifically to the Berger 230’s or 245’s ? But any tips would be great.
Thanks in advance.
BB
I have a question to ask, has anyone got data on a 30’’ barrel in 300NM?
If I could be fussy, then I would be asking specifically to the Berger 230’s or 245’s ? But any tips would be great.
Thanks in advance.
BB
So I was able to score some N565 (would have rather got 570), but is what it is. Does anyone have data on 565 and the following:
220 ELD-X
250 A-tip
245 EOL (don’t have any, but here’s to hoping)
220 ELD-X
250 A-tip
245 EOL (don’t have any, but here’s to hoping)
Sorry for the late reply but I am running the Flatlines. I never posted any load data as I never finished load development before I moved but here is the gist of it:
28" barrel with 1:8" twist
198 gr Warner Flatline
N 570 @ 90.4 grs = 3222 FPS @ 88*
Federal 215M
I still need to screw with seating depths but was dealing with Peterson brass and their short headspace so I was blowing them forward while testing powder loads.
I should have more data here within the month hopefully.
Maybe the powder dried out. It's my latest obsession, relative humidity changes in powder.
hmmm,
do we need to start storing powder in a humidor?
It's been mentioned about throwing some desiccant packets in the powder to keep down moisture. How much moisture will the desiccant packets take out of the powder?
Edit - just pulled from another thread
other thread
A desiccant alone is the wrong approach regarding humidity, look at the 2-way humidor packs.
How does humidity affect powder?
You may have heard about a relationship between humidity and bullet velocity either in a book, on a reloading forum, or from a crusty benchrest shooter right after saying they get better ES/SD̵…
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Yep I just bought a box of the 49% ones yesterday. Haven’t figured out how I’m gonna use them yet. Probably in a mason jar with the powder for a few days before a loading session with a D2 in there too
So here are my last two results with the 198 Flatlines and N570.
The target with 6 different groups (5 are from the .300 NM, the one on the very bottom left is from one of my 7 WSMs) is the most recent and was testing seating depths. All my previous shooting was done with the projectiles touching the lands. The rifle/projectiles seem to prefer .005 jump better for accuracy than touching and definitely didn't seem to like jumping .020 or .050 jump. This wasn't much of a surprise since they are so long. These groups were shot at 100 yards and the best was the CCB with .005 jump and measured 2/3 MOA.
No, they aren't 5-shot groups with the cost to shoot these things, plus barrel life; I'm not keen on wasting them.
The other target with one group was shot at 300 yards. It was 6x 3-shot groups with varying powder charges, and the projos were set to touching. It managed about 1.1 MOA.
I only have about 70 rounds through this barrel but 1 MOA seems to be about where I'm at with it or a little better. I'm also not pushing these projectiles as fast as I could but I'm not trying to kill the brass within 2 firings either.
By the way, I have an unopened 8-pound jug of Retumbo if anyone has some N570 to trade around Texas.
The target with 6 different groups (5 are from the .300 NM, the one on the very bottom left is from one of my 7 WSMs) is the most recent and was testing seating depths. All my previous shooting was done with the projectiles touching the lands. The rifle/projectiles seem to prefer .005 jump better for accuracy than touching and definitely didn't seem to like jumping .020 or .050 jump. This wasn't much of a surprise since they are so long. These groups were shot at 100 yards and the best was the CCB with .005 jump and measured 2/3 MOA.
No, they aren't 5-shot groups with the cost to shoot these things, plus barrel life; I'm not keen on wasting them.
The other target with one group was shot at 300 yards. It was 6x 3-shot groups with varying powder charges, and the projos were set to touching. It managed about 1.1 MOA.
I only have about 70 rounds through this barrel but 1 MOA seems to be about where I'm at with it or a little better. I'm also not pushing these projectiles as fast as I could but I'm not trying to kill the brass within 2 firings either.
By the way, I have an unopened 8-pound jug of Retumbo if anyone has some N570 to trade around Texas.
Attachments
You might try tighter neck tension. I was getting similar results with solids in my .300NM but when I swapped the bushing and mandrel for tighter necks I got much better groups. Of course, your mileage may vary.
Need help loading ELR 300 NM with new long projectiles. Would like to increase throat out to 3.780” OGIVE to use new long projectiles 245 Elite Hunter and 250 ATIP. Then I could then seat my new projectiles within the mag or hand feed and not be forced to seat below dreaded Neck Shoulder Junction. My local gunsmith will not do it and will go to OGIVE max 3.766” - will not explain why…please give me some insight or thoughts. Am I going wrong or too far?
I'm not an expert but I think you need to have a different Reimer to get the longer throat
need something next to it for a visual... like a dime?? 50 cent piece?
that 25 or 200 yards? before I get really excited
the holes are .308"need something next to it for a visual... like a dime?? 50 cent piece?
that 25 or 200 yards? before I get really excited
babyguppy, just for you. 100 yards, 215 Berger running 3055fps. BTW that dime is from 1998, so it has a lot of wear on it. Smaller than a new dime
I love when 6-8 are kicking butt, great barrel!! you get a few kudo's as wellView attachment 7843663
babyguppy, just for you. 100 yards, 215 Berger running 3055fps. BTW that dime is from 1998, so it has a lot of wear on it. Smaller than a new dime
Pulled my last shot (#5) celebrating.. MRAD's new barrel
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Here's the data I collected so far - new Lapua brass out of a MRAD (26" 1:8 twist rate as I recall) - likely switching to a preferred powder as well - but run what you got was the idea here:
H50BMG (91gr was getting crunchy during bullet seating)
220gr SMK
86gr - 2717fps - 8.29sd
87gr - 2771fps - 10.1sd
89gr - 2838fps - 6.05sd
90gr - 2877fps - 2.76sd
91gr - 2900fps - 7.35sd
H50BMG
230gr A-Tip
91gr - 2833fps - 3.30sd
H4381
220gr SMK
77gr - 2916fps - 2.62sd
78gr - 2979fps - 13.3sd
79gr - 3016fps - 4.5sd
80gr - 3035fps - 10.3sd
H4381
230gr A-Tip
74gr - 2690fps - 16sd
---skipped 75,76gr---
77gr - 2779fps - 9.93sd
78gr - 2814fps - 5.1sd
79gr - 2859fps - 11sd
80gr - 2898fps - 6.02sd
81gr - 2950ps - 10.1sd
H4350
230gr A-Tip
77gr - 2949ps - 6.6sd
H50BMG (91gr was getting crunchy during bullet seating)
220gr SMK
86gr - 2717fps - 8.29sd
87gr - 2771fps - 10.1sd
89gr - 2838fps - 6.05sd
90gr - 2877fps - 2.76sd
91gr - 2900fps - 7.35sd
H50BMG
230gr A-Tip
91gr - 2833fps - 3.30sd
H4381
220gr SMK
77gr - 2916fps - 2.62sd
78gr - 2979fps - 13.3sd
79gr - 3016fps - 4.5sd
80gr - 3035fps - 10.3sd
H4381
230gr A-Tip
74gr - 2690fps - 16sd
---skipped 75,76gr---
77gr - 2779fps - 9.93sd
78gr - 2814fps - 5.1sd
79gr - 2859fps - 11sd
80gr - 2898fps - 6.02sd
81gr - 2950ps - 10.1sd
H4350
230gr A-Tip
77gr - 2949ps - 6.6sd
Thanks for sharing !
Just 2 points:
1. When you say H4381, do you mean H4831 or H4831SC?
2. I’m surprised by how good H4350 was! I would’ve thought that was waaay too fast of a powder to be used! Well done!
I’m going to start my load development next weekend. Going to be loading up some 225 ELD-M with H1000 and N570 to see results.
I’ll report back when done
H4381 (not SC) and I wouldn’t have tried the 4350 but Nosler said it was the most accurate (IMR 4350 specifically) for the 300RUM which is pretty similar
I have just about everything for 300NM except for a chambered barrel. Any preferred gunsmith that can do one on a AXMC?
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Why not buy a factory barrel? They are Bartlein finished by WinTac right?
Cause I hate the wrench flats on the barrels and I want something in a bigger contour.AI AXMC 2018 Profile Barrels - EuroOptic
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Why not buy a factory barrel? They are Bartlein finished by WinTac right?
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