I have a Remington 600 with the 18.5" vent rib barrel in 6.5 Remington Magnum. I've loaded 120 Nosler's with H4831 that shoot well but there is way too much muzzle flash. I'm assuming unburnt powder. I would like to try the 125 NPT but with some something that will be accurate and reduce the muzzle flash. Are there any suggestions?
6.5 Remington Magnum Help
- Thread starter grry10
- Start date
- Nov 4, 2004
- 25,341
- 8,899
You can try a faster powder but shooting+/- 60 grs of any powder in a 18.5" barrel is going to have muzzle flash.
I had excellent accuracy with IMR4831 and the 125 gr PT in a M673 Guide rifle.
JD338
I had excellent accuracy with IMR4831 and the 125 gr PT in a M673 Guide rifle.
JD338
DrMike
Ballistician
- Nov 8, 2006
- 37,401
- 6,208
Some potential powders, but no guarantees concerning muzzle flash. And then, there is the question of availability.
Code:
Cartridge : 6.5 mm Rem. Mag.
Bullet : .264, 125, Nosler PART SP 16320
Useable Case Capaci: 60.597 grain H2O = 3.935 cm³
Cartridge O.A.L. L6: 2.806 inch = 71.27 mm
Barrel Length : 18.5 inch = 469.9 mm
Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 63000 psi, or 434 MPa
or a maximum loading ratio or filling of 110 %
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 !
12 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Alliant Reloder-26 *C 100.3 60.2 3.90 3025 100.0 63000 18018 0.989 ! Near Maximum !
Alliant Reloder-25 *C 109.3 60.7 3.93 3010 99.9 63000 17515 0.974 ! Near Maximum !
Norma MRP *C 101.2 59.0 3.82 3000 99.0 63000 17974 0.984 ! Near Maximum !
Vihtavuori N560 *C 103.0 58.8 3.81 2992 96.1 63000 18152 0.978 ! Near Maximum !
IMR 7828 107.5 58.4 3.78 2987 96.7 63000 17678 0.967 ! Near Maximum !
IMR 7828 SSC 101.7 58.4 3.78 2987 96.7 63000 17678 0.967 ! Near Maximum !
Accurate MAGPRO 103.2 61.3 3.97 2979 94.5 63000 18162 0.984 ! Near Maximum !
Alliant Reloder-22 *C 103.3 58.3 3.78 2973 97.9 63000 17584 0.983 ! Near Maximum !
Winchester WXR 106.0 58.6 3.80 2972 97.8 63000 17589 0.983 ! Near Maximum !
Vihtavuori N565 *C*T 107.8 61.8 4.01 2970 96.4 63000 17983 0.996 ! Near Maximum !
Alliant Reloder-16 *C *T 95.8 52.1 3.38 2961 100.0 63000 16110 0.972 ! Near Maximum !
Ramshot Magnum 103.0 62.7 4.06 2961 98.5 63000 16956 0.975 ! Near Maximum !
Alliant Reloder-17 *T 90.8 53.2 3.45 2959 100.0 63000 16039 0.981 ! Near Maximum !
Alliant Reloder-23 *C *T 105.0 57.4 3.72 2953 100.0 63000 16019 0.988 ! Near Maximum !
Vihtavuori N570 *C 110.0 64.8 4.20 2946 90.4 57765 19086 1.016 ! Near Maximum !
Norma MRP 2 *C 110.0 61.4 3.98 2946 96.5 59588 18055 1.011 ! Near Maximum !
Vihtavuori N568 *C*T 110.0 64.1 4.15 2943 93.6 58716 18487 1.012 ! Near Maximum !
Vihtavuori N555 *C*T 101.9 55.8 3.62 2943 100.0 63000 16340 1.006 ! Near Maximum !
Alliant Reloder-19 *C 100.1 55.9 3.62 2937 97.8 63000 16743 0.977 ! Near Maximum !
Ramshot Hunter 95.6 55.2 3.57 2934 99.5 63000 16388 0.984 ! Near Maximum !
Winchester 760 90.4 53.4 3.46 2933 99.0 63000 16440 0.985 ! Near Maximum !
Hodgdon H414 90.4 53.4 3.46 2933 99.0 63000 16440 0.985 ! Near Maximum !
Somchem S365 97.1 54.0 3.50 2928 100.0 63000 15370 0.995 ! Near Maximum !
Norma URP *C 95.2 52.6 3.41 2918 100.0 63000 15797 0.989 ! Near Maximum !
Norma 204 *C 95.0 54.8 3.55 2917 97.6 63000 16323 0.977 ! Near Maximum !
Hodgdon LVR 92.9 51.9 3.36 2916 99.9 63000 15778 0.984 ! Near Maximum !
Vihtavuori N550 *C*T 92.5 52.8 3.42 2916 99.9 63000 15935 0.993 ! Near Maximum !
Hodgdon H4831 *T 105.4 57.2 3.71 2913 95.8 63000 16410 0.974 ! Near Maximum !
Hodgdon H4831 SC *T 101.3 57.2 3.71 2913 95.8 63000 16410 0.974 ! Near Maximum !
Accurate 4350 94.3 52.7 3.42 2912 100.0 63000 15815 1.006 ! Near Maximum !
Somchem S385 100.3 56.6 3.67 2903 98.6 63000 16119 0.995 ! Near Maximum !
IMR 4831 99.9 53.4 3.46 2901 100.0 63000 15494 0.997 ! Near Maximum !
Hodgdon H1000 *T 110.0 60.8 3.94 2896 95.8 58777 16926 0.996 ! Near Maximum !
Winchester Supreme 780 98.7 58.1 3.77 2894 97.7 63000 15918 0.981 ! Near Maximum !
Accurate 3100 103.3 57.7 3.74 2891 99.5 63000 15796 1.009 ! Near Maximum !
Lovex S071 109.3 57.7 3.74 2891 99.5 63000 15796 1.009 ! Near Maximum !
Vihtavuori N165 *C 105.5 58.3 3.78 2891 98.3 63000 15742 0.985 ! Near Maximum !
Hodgdon Hybrid 100V 97.7 52.8 3.42 2885 100.0 63000 14643 0.988 ! Near Maximum !
Vihtavuori N160 *C 92.5 52.8 3.42 2884 100.0 63000 15047 0.988 ! Near Maximum !
Lovex S070 95.0 52.5 3.40 2884 99.2 63000 15606 0.994 ! Near Maximum !
Shooters World SW4350 95.0 52.5 3.40 2884 99.2 63000 15606 0.994 ! Near Maximum !
IMR 4955 Enduron *C*T 102.6 55.7 3.61 2882 96.2 63000 15878 0.975 ! Near Maximum !
IMR 4007 SSC 90.1 51.0 3.31 2868 98.7 63000 15313 0.985 ! Near Maximum !
Shooters World Long Rifle 94.0 51.4 3.33 2865 99.7 63000 15075 0.992 ! Near Maximum !
Lovex S065 94.0 51.4 3.33 2865 99.7 63000 15075 0.992 ! Near Maximum !
Hunter26
Beginner
- Jul 10, 2024
- 89
- 242
Short barrels = muzzle flash. You may be able to reduce it with certain powders but you'd have to experiment a lot. I shoot several Encore pistols in rifle calibers and I just deal with it as a trade off for the short barrel. You could always get a suppressor, that would make a big difference
6mm Remington
Ammo Smith
- Feb 27, 2006
- 5,255
- 626
In my Remington Model 600 Centennial in 6mm Remington the flash is noticeable with it also. Using IMR4350. I don't think there is anything you can do really except a suppressor possibly to help out. Nature of the beast I'm afraid.
wvbuckbuster
Handloader
- Nov 5, 2015
- 2,680
- 2,401
If you use faster burning powders with reduced loads to lessen the muzzle flash, then you will have reduced the capability of the cartridge. One of those situations where you have to grin and bear it, I guess.
Dan.
Dan.
Sarahclark
Beginner
- Dec 7, 2024
- 1
- 1
Cutting power for less flash? Bold move
DrMike
Ballistician
- Nov 8, 2006
- 37,401
- 6,208
Welcome aboard, Sarahclark. Interesting initial post.
gerry
Ammo Smith
- Mar 1, 2007
- 6,908
- 1,791
I do wonder if a faster powder makes a difference. The 375 Ruger I used to own had a 20" barrel, it burned around 80 gr of Big Game powder and muzzle flash wasn't noticeable. Of course it's a bigger bore size and a 1.5" longer barrel than the OP's 6.5 Rem Mag.
Very cool round by the way, it was decades ahead of it's time. Compares very well to the 6.5 PRC.
Very cool round by the way, it was decades ahead of it's time. Compares very well to the 6.5 PRC.
RL338
Handloader
- Mar 23, 2017
- 3,366
- 5,487
Yep , short barrel , big case equals a nice flash.
Even my 257 Wby lays down a nice fireball on RL-33.
Even my 257 Wby lays down a nice fireball on RL-33.
- Nov 4, 2004
- 25,341
- 8,899
300WSM
Handloader
- Dec 24, 2011
- 961
- 577
Two things..
IMO the only chance you will have with that is experimenting with primers. They are not created equal that is for sure....
Fed GM215m are the hottest and I would try those first.
If you've already done that...then try the weakest...rem 9 1/2m
IMR 4350 powder ? I spent a lot of time with a model 7 and it loved IMR 4350 and didn't notice an abnormal blast..
good luck
What kind of primer are you using?
IMO the only chance you will have with that is experimenting with primers. They are not created equal that is for sure....
Fed GM215m are the hottest and I would try those first.
If you've already done that...then try the weakest...rem 9 1/2m
IMR 4350 powder ? I spent a lot of time with a model 7 and it loved IMR 4350 and didn't notice an abnormal blast..
good luck
I surely don't know the answer to this , I think the quickload info Dr Mike supplied could have the answer . I would look at low case fill % with 100% powder burn . I looked down the list and found RL17 looks to be a candidate . it has a case fill of 90.8% at max load , and 100% burn . I would think this is what you need to look for , but I could be way out in left field . interesting project you have here , let us know how you make out on this .
there simply could be no fixing the muzzle flash issue either .
there simply could be no fixing the muzzle flash issue either .
- Thread starter
- #17
300WSM
Handloader
- Dec 24, 2011
- 961
- 577
Yeah...this
PLUS...
I thought about this a bit since it was posted and while I'd still consider playing with different primer mfg's...
None of it might matter.
The bbl/caliber combo is going to have an inherent type of report/flash...
What might be obnoxious to the OP might be normal to us
300WSM
Handloader
- Dec 24, 2011
- 961
- 577
You mentioned using 120 Nosler bullets...
Which ones were they?
The one thing you can't change.
Bbl length.
But things you can change...
Powder (though I doubt much flash will change if you want to keep the 6.5 mag performance)
Powder, charge amount and type
Primers , different mfg's
Maybe the most glaring
...Bullet.
Boat tail versus solid base
Weight differences as well...
There are several variables to try but they may all yield the same results as we're back to that 18.5 bbl again.
