Quick load request 7mm-08 155gr Terminal Ascent, Ramshot Hunter and Superformance

sticks · Thursday at 10:08 PM

Hello, I am having difficulty getting Gordon's and reality to match up. Terminal Ascent isn't listed in GordonsRT, and it's not in any of my books. Hoping to get a Quickload for
-7mm-08, .284
-22" barrel
-155gr Terminal ascent, 1.514", .586 B.C.
-Fired Nosler Brass, 56.6gr CC water
-Powder, Ramshot Hunter, *picking up Superformance powder tomorrow, would be nice to see this one as well, thanx in advance, I would be very grateful.

My velocity is really low compared to where GRT thinks it's supposed to be. 1) I might have to move my chronograph further back 3' currently. 2) might have to try magnum primers. 3) might have to verify with a different chronograph. 4) might need more powder to build higher pressures for the ball powder. I was showing 2398 and was expecting 2600. I ended at 45gr. I believe Nosler data for 160gr and Ramshot Hunter is 49gr powder.

sticks · Thursday at 10:12 PM

Forgot to mention OAL: 2.830

sako2 · 2026-05-29T01:21:31-0700

Your not that far off on velocity. Nosler used a 26" barrel. That can account for the low velocity. I never hit book velocities with my loads.

highoctane · 2026-05-29T03:46:38-0700

sticks said:
Hello, I am having difficulty getting Gordon's and reality to match up. Terminal Ascent isn't listed in GordonsRT, and it's not in any of my books. Hoping to get a Quickload for
-7mm-08, .284
-22" barrel
-155gr Terminal ascent, 1.514", .586 B.C.
-Fired Nosler Brass, 56.6gr CC water
-Powder, Ramshot Hunter, *picking up Superformance powder tomorrow, would be nice to see this one as well, thanx in advance, I would be very grateful.

My velocity is really low compared to where GRT thinks it's supposed to be. 1) I might have to move my chronograph further back 3' currently. 2) might have to try magnum primers. 3) might have to verify with a different chronograph. 4) might need more powder to build higher pressures for the ball powder. I was showing 2398 and was expecting 2600. I ended at 45gr. I believe Nosler data for 160gr and Ramshot Hunter is 49gr powder.

I space my Chrono 10-15 ft from muzzle, muzzle blast can and will give some funky readings. 2...Magnum primers could help a little bit but is probably not the panacea of the issue.... 3...Possible Chrono issue valid. Probably not though.

Number 4 is the winner IMO, keep adding powder while watching velocity numbers, (there will be a place you must stop though) and looking for high pressure indicators, cratering, flattening etc,, ejector marks on case, sticky bolt, hard to extract cases, be advised, while primer condition has always been used to determine high pressure I have always believed that once this shows up your cartridge pressure is a good bit above the SAMMI pressure standard for that cartridge, which for the 708 is 61,000 psi.

In my estimation cratered primers and the other case issues, if caused by high pressure are a buzzing rattlesnake. Don't let it bite you!! It might or might not kill you, but it'll leave a mark regardless!

SJB358 · 2026-05-29T04:44:04-0700

I am around 49 grains of Hunter with a 162 ELDM in Lapua brass with CCI250’s. It’s a full case of powder and speeds right at 2700.

If Hunter doesn’t get you the speed you want you may wanna try Big Game with the 155. I’d keep pushing up in charge weight, you should be good for 2700 with the 155 TA.

Firebird24 · 2026-05-29T11:00:33-0700

Have you scrolled to the bottom of this page and read through the “similar threads” section. Some very good suggestions if you can be flexible with your powder selection-

sticks · 2026-05-29T15:29:33-0700

Yesir, i have. Specifically looking for Terminal ascent data tho. This sucker is long, 1.514", my 150gr ABLR are 1.4" and my 150gr scirocco 2 are 1.385. The .284, 155gr Terminal Ascents have been unobtanium for yearrrs. I've been looking for 4 maybe 5 years now. Finally found a box 55 min drive away. I'm taking it slow, trying not to waste what I do have. I have literally N0 load data on 155 TA, even commercial loadings are non existent in 7mm-08. 280AI, 7 prc, 28 nosler, 7 back country are the only I've seen in 7mm. I have heard of people buying the loaded rounds, and pulling them, but hell no. GordonsRT is my only resources for data on this loading currently. Otherwise I'm reloading blind, that's why the Quickload data is so valuable. 45gr hunter gave me a 1/2 moa with 3 rounds touching and got me excited, just had trouble believing my velocity data. Slow and careful wins this load development race. Thank you everyone for your input, it is most appreciated ty

DrMike · 2026-05-29T16:04:38-0700

Code:

Cartridge          : 7 mm-08 Rem.
Bullet             : .284, 155, Fed Terminal ASC Comp Bul
Useable Case Capaci: 44.604 grain H2O = 2.896 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Ramshot Hunter

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   96    40.95   2408    2060   41900   8725     94.3    1.326
-09.0   98    41.41   2436    2108   43342   8831     94.8    1.305
-08.0   99    41.86   2464    2157   44840   8933     95.3    1.285
-07.0  100    42.32   2492    2206   46396   9033     95.7    1.265
-06.0  101    42.77   2520    2256   48009   9129     96.1    1.245
-05.0  102    43.23   2548    2306   49686   9222     96.6    1.226
-04.0  103    43.68   2576    2357   51406   9312     96.9    1.207  ! Near Maximum !
-03.0  104    44.14   2604    2409   53237   9398     97.3    1.189  ! Near Maximum !
-02.0  105    44.59   2632    2461   55111   9480     97.7    1.170  ! Near Maximum !
-01.0  106    45.05   2660    2514   57073   9558     98.0    1.152  ! Near Maximum !
+00.0  107    45.50   2688    2567   59108   9633     98.3    1.135  ! Near Maximum !
+01.0  108    45.96   2716    2621   61226   9703     98.6    1.117  !DANGEROUS LOAD-DO NOT USE!
+02.0  109    46.41   2744    2675   63431   9769     98.8    1.100  !DANGEROUS LOAD-DO NOT USE!
+03.0  110    46.87   2772    2730   65729   9831     99.0    1.083  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    47.32   2800    2786   68120   9888     99.2    1.067  !DANGEROUS LOAD-DO NOT USE!
+05.0  113    47.78   2828    2842   70616   9941     99.4    1.051  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    107    45.50   2758    2703   65356   9568     99.7    1.090  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    107    45.50   2606    2413   53296   9559     95.7    1.186  ! Near Maximum !

sticks · 2026-05-29T18:55:12-0700

DrMike said:

Code:

Cartridge          : 7 mm-08 Rem.
Bullet             : .284, 155, Fed Terminal ASC Comp Bul
Useable Case Capaci: 44.604 grain H2O = 2.896 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Ramshot Hunter

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   96    40.95   2408    2060   41900   8725     94.3    1.326
-09.0   98    41.41   2436    2108   43342   8831     94.8    1.305
-08.0   99    41.86   2464    2157   44840   8933     95.3    1.285
-07.0  100    42.32   2492    2206   46396   9033     95.7    1.265
-06.0  101    42.77   2520    2256   48009   9129     96.1    1.245
-05.0  102    43.23   2548    2306   49686   9222     96.6    1.226
-04.0  103    43.68   2576    2357   51406   9312     96.9    1.207  ! Near Maximum !
-03.0  104    44.14   2604    2409   53237   9398     97.3    1.189  ! Near Maximum !
-02.0  105    44.59   2632    2461   55111   9480     97.7    1.170  ! Near Maximum !
-01.0  106    45.05   2660    2514   57073   9558     98.0    1.152  ! Near Maximum !
+00.0  107    45.50   2688    2567   59108   9633     98.3    1.135  ! Near Maximum !
+01.0  108    45.96   2716    2621   61226   9703     98.6    1.117  !DANGEROUS LOAD-DO NOT USE!
+02.0  109    46.41   2744    2675   63431   9769     98.8    1.100  !DANGEROUS LOAD-DO NOT USE!
+03.0  110    46.87   2772    2730   65729   9831     99.0    1.083  !DANGEROUS LOAD-DO NOT USE!
+04.0  111    47.32   2800    2786   68120   9888     99.2    1.067  !DANGEROUS LOAD-DO NOT USE!
+05.0  113    47.78   2828    2842   70616   9941     99.4    1.051  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    107    45.50   2758    2703   65356   9568     99.7    1.090  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    107    45.50   2606    2413   53296   9559     95.7    1.186  ! Near Maximum !

Thank you Dr Mike, I appreciate you sir. Ty

sticks · 2026-05-29T19:01:32-0700

My load of H4350 with 140gr Partitions was spot on in GRT. So was my load with Varget and 139gr Interlocks. Both Ramshot Big Game with 120gr TTSX, and Hunter with 155 T.A. were both below estimates by quite a bit. Beginning to thing the data IN GRT for Ramshot powders is to be taken with a grain of salt.