7mm-08 with short barrel - to AI or not?

[orchemo]

Having a Tikka 7mm-08 cut and threaded at 17 inches. Want to play with a short barrel with a suppressor.

I understand some cartridges benefit from AI (280AI') and some it just doesn't matter.

Planning on losing about 25 FPS with the barrel cut. What about trying to offset this with an AI chamber?

Input appreciated.

 

[xphunter]

I would expect to lose between 25-35 fps per inch.
The 7mm-08AI will help a lot with the MV loss with removing 7" inches of barrel (Assuming you have a 24" barrel).
I think it will be close enough, that the animal will never know the difference at your max distance.
What barrel length does it have right now and what MV with what bullet weight are you currently getting?

 

[Ridge_Runner]

and no trimming.

 

[orchemo]

Tikka's are 22 from the factory. Didn't chrono before.

Agreed that no game, mostly deer and bear, will know the difference.

With a suppressor, the barrel length will be essentially back to factory length, but quite and less recoil.

This is truly one of those, the rifle is sitting in the back of the safe, needs a better purpose......how about !!!!

Thinking about bullet weight, I have a bunch of 120 and 140 BTs and ABs. Will play with each for best groups, maybe even try a 120 something mono.

Just need to find SRP brass for 7mm-08 or resize from 243 or 308?


I like my 280AIs

 

[hunter24605]

If you don't mind going down a reloading rabbit hole, the 119 gr Absolute Hammer bullet is a vital organ blender that leaves a very dead deer between two holes. It generates some very impressive speeds, it may just be the ticket to gain back some velocity with the short tube.

 

[JD338]

If you don't mind going down a reloading rabbit hole, the 119 gr Absolute Hammer bullet is a vital organ blender that leaves a very dead deer between two holes. It generates some very impressive speeds, it may just be the ticket to gain back some velocity with the short tube.

Vital Organ Blender
That's a keeper!

JD338

 

[jimbires]

this is where I really like quickload . all the what if's a guy thinks about .


I used a 120 ballistic tip bullet . RL17 gave the highest velocity in both chamberings . here is the results .


7mm-08 AI
Cartridge : 7 mm-08 Ack. Imp. Rem.
Bullet : .284, 120, Nosler BalTip 28120
Useable Case Capaci: 52.668 grain H2O = 3.420 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 17.0 inch = 431.8 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60191 psi, or 415 MPa
or a maximum loading ratio or filling of 105 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
ReloadSwiss RS 60 *T 105.0 53.5 3.47 3012 99.0 59621 15478 0.847 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-17 *T 104.4 53.2 3.45 3003 98.3 60191 15247 0.846 !DANGEROUS LOAD-DO NOT USE!
Elcho 17 104.4 53.2 3.45 3003 98.3 60191 15247 0.846 !DANGEROUS LOAD-DO NOT USE!
Winchester 760 103.3 53.1 3.44 2942 93.1 60191 14701 0.855 !DANGEROUS LOAD-DO NOT USE!


7mm-08

Cartridge : 7 mm-08 Rem.
Bullet : .284, 120, Nosler BalTip 28120
Useable Case Capaci: 49.373 grain H2O = 3.206 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 17.0 inch = 431.8 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60191 psi, or 415 MPa
or a maximum loading ratio or filling of 105 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Elcho 17 105.0 50.1 3.25 2915 97.0 56822 14405 0.864 ! Near Maximum !
Alliant Reloder-17 *T 105.0 50.1 3.25 2915 97.0 56822 14405 0.864 ! Near Maximum !
ReloadSwiss RS 60 *T 105.0 50.1 3.25 2902 97.6 55284 14585 0.872 ! Near Maximum !
Winchester 760 105.0 50.5 3.28 2890 91.9 58910 13931 0.857 ! Near Maximum !

 

[JD338]

Those are impressive speeds either way from a 15" barrel.

JD338

 

[RL338]

Just need to find SRP brass for 7mm-08 or resize from 243 or 308?

I do not believe there anyone producing SRP 7-08 brass. 243 , 260 , and 308 is available in SRP

 

[orchemo]

Barrel is scheduled to FINALLY get back to me this week. Tikka 7mm-08 cut to 17 inches. Ordered a couple more suppressors, one is the Nosler 30K. Held it yesterday at the FFL, excited to see how it will preform on this barrel....hopefully my suppressor approval time won't be too long.

Thinking no AI for the barrel, start with 120 gr BT and see how they shoot and what velocity I get. Start with some Big Game powder as this is the highest velocity powder in Nosler data and I have 8 pounds sitting around.

 

[jimbires]

here is a longer list of powders for this combo .

Cartridge : 7 mm-08 Rem.
Bullet : .284, 120, Nosler BalTip 28120
Useable Case Capaci: 49.384 grain H2O = 3.206 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 17.0 inch = 431.8 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60191 psi, or 415 MPa
or a maximum loading ratio or filling of 105 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Elcho 17 105.0 50.1 3.25 2915 97.0 56830 14409 0.864 ! Near Maximum !
Alliant Reloder-17 *T 105.0 50.1 3.25 2915 97.0 56830 14409 0.864 ! Near Maximum !
ReloadSwiss RS 60 *T 105.0 50.1 3.25 2903 97.6 55298 14589 0.872 ! Near Maximum !
Winchester 760 105.0 50.6 3.28 2890 91.9 58926 13935 0.857 ! Near Maximum !
Hodgdon H414 105.0 50.6 3.28 2890 91.9 58926 13935 0.857 ! Near Maximum !
Bofors RP3 103.4 47.6 3.08 2888 98.2 60191 13394 0.870 !DANGEROUS LOAD-DO NOT USE!
Norma 203 old 103.4 47.6 3.08 2888 98.2 60191 13394 0.870 !DANGEROUS LOAD-DO NOT USE!
Accurate 4064 103.5 46.1 2.99 2877 99.9 60191 12916 0.889 !DANGEROUS LOAD-DO NOT USE!
Shooters World Match Rifle 98.1 46.0 2.98 2873 99.5 60191 12829 0.872 !DANGEROUS LOAD-DO NOT USE!
Accurate 2520 95.9 46.0 2.98 2873 99.5 60191 12829 0.872 !DANGEROUS LOAD-DO NOT USE!
Lovex D073.6 98.1 46.0 2.98 2873 99.5 60191 12829 0.872 !DANGEROUS LOAD-DO NOT USE!
Accurate 2495 97.5 43.4 2.81 2867 100.0 60191 12419 0.893 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H380 102.3 47.6 3.08 2866 95.2 60191 13317 0.864 !DANGEROUS LOAD-DO NOT USE!
Rottweil R903 105.0 47.3 3.06 2860 97.7 58840 13200 0.879 ! Near Maximum !
Somchem S355 105.0 46.8 3.03 2858 97.6 59379 13123 0.872 ! Near Maximum !
SNPE Vectan SP 7 96.4 47.1 3.05 2838 95.1 60191 12858 0.867 !DANGEROUS LOAD-DO NOT USE!
Lovex D073.5 91.8 44.8 2.90 2836 99.1 60191 12419 0.877 !DANGEROUS LOAD-DO NOT USE!
Accurate 2460 91.5 44.8 2.90 2836 99.1 60191 12419 0.877 !DANGEROUS LOAD-DO NOT USE!
Rottweil R901 96.8 41.9 2.71 2830 99.7 60191 12256 0.882 !DANGEROUS LOAD-DO NOT USE!
IMR 4007 SSC 103.5 47.8 3.10 2819 91.5 60191 12808 0.864 !DANGEROUS LOAD-DO NOT USE!
PB Clermont PCL 511 105.0 50.9 3.30 2815 91.5 54209 13641 0.889 ! Near Maximum !
Vihtavuori N550 *C 105.0 48.8 3.16 2814 94.0 54114 13601 0.900 ! Near Maximum !
Hodgdon LVR 105.0 47.8 3.10 2801 93.2 53734 13301 0.894 ! Near Maximum !
ReloadSwiss RS 70 *C 105.0 50.9 3.30 2769 90.9 50691 13807 0.912
Bofors RP7 105.0 46.9 3.04 2763 90.5 56697 12550 0.889 ! Near Maximum !
Rottweil R907 105.0 46.9 3.04 2763 90.5 56697 12550 0.889 ! Near Maximum !
ReloadSwiss RS 62 105.0 50.1 3.25 2743 91.9 48654 13485 0.940
Alliant Reloder-16 *C *T 105.0 46.6 3.02 2739 92.6 48747 13320 0.928
Bofors RL16 TZ *C *T 105.0 46.6 3.02 2739 92.6 48747 13320 0.928
Shooters World Long Rifle 105.0 46.8 3.03 2732 92.5 53755 12490 0.915 ! Near Maximum !
Lovex S065 105.0 46.8 3.03 2732 92.5 53755 12490 0.915 ! Near Maximum !
Norma URP *C 105.0 47.3 3.06 2721 92.4 48622 13048 0.939
Bofors RP19 ~approximation 105.0 47.3 3.06 2720 92.4 48575 13039 0.940
Accurate 4350 105.0 47.8 3.10 2719 92.4 48314 13194 0.955
Norma 204 *C 105.0 49.4 3.20 2710 85.9 51227 12652 0.913 ! Near Maximum !
Ramshot Hunter 105.0 49.4 3.20 2706 89.4 48416 13052 0.938
Shooters World SW4350 105.0 47.3 3.06 2698 89.9 51067 12533 0.936
Lovex S070 105.0 47.3 3.06 2698 89.9 51067 12533 0.936
PB Clermont PCL 518 105.0 49.4 3.20 2679 88.3 47179 12917 0.950
Bofors RP4 NT *C ~approximation 105.0 48.5 3.14 2673 88.1 48897 12440 0.941
Somchem S365 105.0 47.5 3.08 2658 94.8 43258 13097 0.988
Hodgdon Hybrid 100V 105.0 46.2 3.00 2623 93.5 44485 12139 0.976
Raufoss RA4 105.0 47.8 3.10 2606 83.7 45835 12068 0.963
Bofors RP4 ~approximation 105.0 47.8 3.10 2606 83.7 45835 12068 0.963
ADI AR 2209 105.0 47.5 3.08 2570 82.1 44002 11967 0.978
Rottweil R904 105.0 47.1 3.05 2564 82.0 45247 11522 0.972
Somchem S361 105.0 50.9 3.30 2560 81.4 46682 11336 0.967
Alliant Reloder-19 *C 105.0 47.8 3.10 2554 82.2 42550 11998 0.998
IMR 4831 105.0 45.8 2.97 2552 89.6 40876 12085 1.027
Winchester Supreme 780 105.0 50.4 3.27 2543 82.4 44132 11553 0.981
Bofors RP14 ~approximation 105.0 47.8 3.10 2526 81.6 41593 11772 1.009

 

[jimbires]

I didn't see big game powder on that list , here it is separately . looks to be a good choice

Cartridge : 7 mm-08 Rem.
Bullet : .284, 120, Nosler BalTip 28120
Useable Case Capaci: 49.384 grain H2O = 3.206 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 17.0 inch = 431.8 mm
Powder : Ramshot Big Game

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 81 39.12 2286 1392 30744 10288 85.3 1.158
-18.0 83 40.10 2346 1467 32852 10665 86.8 1.127
-16.0 85 41.08 2407 1544 35107 11035 88.2 1.095
-14.0 87 42.05 2469 1624 37524 11397 89.6 1.064
-12.0 89 43.03 2530 1706 40114 11748 90.9 1.030
-10.0 91 44.01 2592 1790 42894 12087 92.1 0.997
-08.0 93 44.99 2654 1878 45878 12413 93.3 0.966
-06.0 95 45.97 2717 1967 49083 12724 94.4 0.936
-04.0 97 46.94 2780 2059 52530 13019 95.4 0.906 ! Near Maximum !
-02.0 99 47.92 2843 2153 56245 13295 96.3 0.878 ! Near Maximum !
+00.0 101 48.90 2905 2249 60247 13551 97.1 0.851 !DANGEROUS LOAD-DO NOT USE!
+02.0 103 49.88 2969 2348 64569 13786 97.8 0.824 !DANGEROUS LOAD-DO NOT USE!
+04.0 105 50.86 3032 2449 69240 13998 98.4 0.799 !DANGEROUS LOAD-DO NOT USE!
+06.0 107 51.83 3095 2552 74291 14185 99.0 0.774 !DANGEROUS LOAD-DO NOT USE!
+08.0 109 52.81 3158 2657 79730 14347 99.4 0.750 !DANGEROUS LOAD-DO NOT USE!
+10.0 111 53.79 3221 2764 85618 14481 99.7 0.727 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 101 48.90 3057 2490 72820 13465 99.9 0.785 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 101 48.90 2707 1952 48847 12901 89.9 0.935

 

[xphunter]

Having a Tikka 7mm-08 cut and threaded at 17 inches. Want to play with a short barrel with a suppressor.

I understand some cartridges benefit from AI (280AI') and some it just doesn't matter.

Planning on losing about 25 FPS with the barrel cut. What about trying to offset this with an AI chamber?

Input appreciated.

A 17" 7mm-08 will likely kill anything you have planned for it.
It is probably capable of distances on game that surpasses what most would be comfortable killing at.
Looking forward to your range reports!

My first 7mm-08 was a 14" center-grip XP-100
40.0 grains of H-4895 with a 140 NBT with a MV of 2540
42. grains of the same powder with a 120 NBT was running 2700 fps.
I killed a lot of critters with that XP-100: pd's, coyote, bobcat, turkey, whitetail, mule deer, and antelope.
Your post, made for a lot of good memories-Thanks!

 

[PJGunner]

Probably the type powder you use could make a difference. I don't have a 7-08 but I do have several rifles chambered to the parent cartridge, IE the .308 Win.

Rifle #1 is a Ruger M77 RSI with 18.5" barrel. Took me a couple of years to find a decently accurate load to use that rifle for hunt purposes. Velocity is 2550 FPS average with the 165 gr. Speer hot Core over W760.

Rifle #1 is a Winchester M70 Youth Ranger with 22" barrel I won in a raffle. It's restocked in a Ramline Velocity is 2650 FPS with the same load.

Note that the velocity from the M70 is the same as what the Speed Grand Slam factory loads delivered from that rifle. Powder looked suspiciously like W760/H414. Accuracy with the Speer GS load and my handload was very good.

Also note that Velocity difference was about 30 FPS per inch.
Paul B.

 

[preacher]

I thi)k you should go ahead and get it Ackleyed, work up loads from Quikloads to 64,500K. Use that light Hammer or the 120s for everything! Then you would have a quiet lightning bolt!