I have been using .402 with the ATIPS & Peterson brass so far. I’m wondering if .401 will lower my ES a bit more?
- Thread starter secondofangle2
- Start date
I loaded the first lot of Atips up today today
With a “hard” jam in my chamber I was at 4.395”COAL, talking to some others shooting this projectile some were having success at 0.1” jump and others said 0.04”, I started with 0.04” and seated to 4.350” COAL, I don’t have a BTO measurement I need a new wheel for the Forster tool for 375 cal
BB brass, Fed gold primer, 2218 powder
I only have the CH4D dies but they are producing repeatable ammo, the neck tension looks to be 4 or 5 thou, getting tight but not silly, with SMK’s I had 3 tho but that was with many times fired brass
I have access to ADI 2218/H50BMG, I loaded from 130 to 134gr, at 134gr I had zero pressure sign the bolt fell open easy, no swipe or stamp on the case head and a SD of 5 on a 2825fps average, I will do another test from 134 upto 137 and see what can be achieved, I hoping to find the next node before pressure gets to high would be good to get to 2900fps but not sure I will achieve it
Just doing pressure tests at 100 everything grouped better than expected
We also tested the Bullet Seeker chrony out, with the parabolic adapter, same deal as before the muzzle blast of the Cheytac is to much for it to get reliable readings, the parabolic adapter did get more readings than without though, some strings only getting one shot reading, positioning under the barrel was best we got 3 readings out of a 5 shot string, the velocities matched the cheap and nasty Cauldwell chrony that reads every shot, the program for the bullet seeker chrony is good though once it is worked out, with smaller guns it is all good.
With a “hard” jam in my chamber I was at 4.395”COAL, talking to some others shooting this projectile some were having success at 0.1” jump and others said 0.04”, I started with 0.04” and seated to 4.350” COAL, I don’t have a BTO measurement I need a new wheel for the Forster tool for 375 cal
BB brass, Fed gold primer, 2218 powder
I only have the CH4D dies but they are producing repeatable ammo, the neck tension looks to be 4 or 5 thou, getting tight but not silly, with SMK’s I had 3 tho but that was with many times fired brass
I have access to ADI 2218/H50BMG, I loaded from 130 to 134gr, at 134gr I had zero pressure sign the bolt fell open easy, no swipe or stamp on the case head and a SD of 5 on a 2825fps average, I will do another test from 134 upto 137 and see what can be achieved, I hoping to find the next node before pressure gets to high would be good to get to 2900fps but not sure I will achieve it
Just doing pressure tests at 100 everything grouped better than expected
We also tested the Bullet Seeker chrony out, with the parabolic adapter, same deal as before the muzzle blast of the Cheytac is to much for it to get reliable readings, the parabolic adapter did get more readings than without though, some strings only getting one shot reading, positioning under the barrel was best we got 3 readings out of a 5 shot string, the velocities matched the cheap and nasty Cauldwell chrony that reads every shot, the program for the bullet seeker chrony is good though once it is worked out, with smaller guns it is all good.
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In my HTI 375CT i had early pressure signs with Retumbo ( AR2225) ...also had several hang fires even with 215m,s,
Thats odd... my case is at 90-95% capacity for sure. 124gr retumbo.
215m,s also.
I tried h50bmg and couldnt get enough in the case. And vhit n570 seemed too horny pressure signs but fast fps.
Geno, the case capacity of the enabelr to the CT is basically the same, why do you think retumbos too fast in the CT case, do you think it has to do with the longer more slender case of the CT?
They aren’t basically the same at all. Look at the prints again. CT is bigger
Your “n” for the SD and ES needs to be 10-20 shots before you draw conclusions. Use Labradar during some long range work and re-evaluate later if the .100” off needs adjustment is what I would do.
I have run 350 SMKs and 390 A-TIPS in 1:12 bartlein at 4000 DA with no problem. I think the optimal twist for 390s is 1:10
When you do the 10-20 shots does your RL50 load ES stay in the single digits still? When you do how much time do wait between shots? I’m going to give that a go when I get a chance to shoot on private land out to 1600m, landowner has a Labradar he will set up.
Anyone plan on trying out 24N41? I’m debating it but I think I have a decent H50BMG load and am getting there with RL50 & Bertram brass, so I’m not sure if the juice is worth the squeeze. Really starting to like these ATIPS.
What is a considered a good ES with a 20 shot string?
I tried it. No advantage. Can’t fit enough in a case to get acceptable speed. Either that or can’t get speed without pressure I forget which but I abandoned it either way.
If your SD are single digit with a 10-20 shot string I’d say you’re doing great. Watch Hornady podcast 50 and 52
BTW thanks for the report on the bullet seeker and muzzle break issues.
390 ATIP in stock at precision reloading
www.precisionreloading.com and even cheaper at Brunos
and even cheaper at Graf:
www.grafs.com
Shop Rifle & Shotgun Reloading Supplies | Dies | Bullets | Hulls | Wads | Powder - Precision Reloading
Shop online for shotshell and metallic reloading supplies, shooting supplies, metallic presses, rifle reloading components, shotshell reloading components, shooting accessories, rifle reloading brass and Bullets.
Hornady Bullets - 375 Cal - 390 Grain - A-TIP Match (25)
Check out the deal on Hornady Bullets - 375 Cal - 390 Grain - A-TIP Match (25) at Bruno Shooters Supply
www.brunoshooters.com
HORNADY 375c(.375) 390g A-TIP MATCH BULLET 25/BX 10/CS - Graf & Sons
375c (.375) 390gr A-Tip Match Bullets Years of research and testing by the Hornady® Ballistic Development Group, combined with advanced manufacturing processes and quality control measures have led to the creation of the ultimate low drag, high performance match bullet. Product FeaturesTip...
www.grafs.com Last edited:
Awesome, thank you!!!390 ATIP in stock at precision reloading
and even cheaper at BrunosShop Rifle & Shotgun Reloading Supplies | Dies | Bullets | Hulls | Wads | Powder - Precision Reloading
Shop online for shotshell and metallic reloading supplies, shooting supplies, metallic presses, rifle reloading components, shotshell reloading components, shooting accessories, rifle reloading brass and Bullets.
and even cheaper at Graf:Hornady Bullets - 375 Cal - 390 Grain - A-TIP Match (25)
Check out the deal on Hornady Bullets - 375 Cal - 390 Grain - A-TIP Match (25) at Bruno Shooters Supplywww.brunoshooters.com
HORNADY 375c(.375) 390g A-TIP MATCH BULLET 25/BX 10/CS - Graf & Sons
375c (.375) 390gr A-Tip Match Bullets Years of research and testing by the Hornady® Ballistic Development Group, combined with advanced manufacturing processes and quality control measures have led to the creation of the ultimate low drag, high performance match bullet. Product FeaturesTip...
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