What can your 6.5 creedmore do that my .260 can't?
- Thread starter gobigorgohome
- Start date
Note usable case capacity (amount that's not occupied by seated bullet)
Code:
Cartridge : .260 Rem
Bullet : .264, 140, Berger Hybr #26414
Useable Case Capaci: 46.393 grain H2O = 3.012 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 22.0 inch = 558.8 mm
Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 103 %
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 !
23 loads produced a Loading Ratio below user-defined minimum of 85%. 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 RL26 101.0 46.4 3.01 2833 100.0 60000 11707 1.104 ! Near Maximum !
IMR 7828ssc 102.0 44.8 2.90 2758 96.0 60000 11385 1.105 ! Near Maximum !
Alliant RL17 90.9 40.8 2.64 2754 100.0 60000 10318 1.119 ! Near Maximum !
Alliant RL22 103.0 44.5 2.89 2742 97.4 59064 11360 1.124 ! Near Maximum !
AA MagPro 103.0 46.8 3.03 2738 93.5 58694 11677 1.147 ! Near Maximum !
Ramshot Magnum 103.0 48.0 3.11 2724 97.8 58897 10942 1.139 ! Near Maximum !
Alliant RL16 96.9 40.4 2.61 2720 100.0 60000 10179 1.132 ! Near Maximum !
Alliant RL19 100.1 42.8 2.77 2711 97.4 60000 10833 1.124 ! Near Maximum !
Code:
Cartridge : 6.5 Creedmoor
Bullet : .264, 140, Berger Hybr #26414
Useable Case Capaci: 46.625 grain H2O = 3.027 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 22.0 inch = 558.8 mm
Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 103 %
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 !
23 loads produced a Loading Ratio below user-defined minimum of 85%. 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 RL26 100.6 46.5 3.01 2833 100.0 60000 11749 1.106 ! Near Maximum !
IMR 7828ssc 101.7 44.9 2.91 2760 96.2 60000 11448 1.106 ! Near Maximum !
Alliant RL17 90.6 40.8 2.65 2753 100.0 60000 10357 1.120 ! Near Maximum !
Alliant RL22 103.0 44.8 2.90 2752 97.6 59641 11449 1.121 ! Near Maximum !
AA MagPro 103.0 47.1 3.05 2749 93.8 59292 11784 1.144 ! Near Maximum !
Ramshot Magnum 103.0 48.2 3.12 2735 98.0 59495 11025 1.135 ! Near Maximum !
Alliant RL16 96.5 40.4 2.62 2720 100.0 60000 10216 1.134 ! Near Maximum !
Alliant RL19 99.8 42.9 2.78 2711 97.5 60000 10887 1.126 ! Near Maximum !
Ha ! Imagine That ! LOL RJ
Mark can you run the same data on a 6.5 x55 Swede and a 6.5 PRC PLEASE ! THks RJ
Either case is restricted by the same mag length. Both have the same issues touching the lands if the throat is long. There is no benefit either way. Building a custom, you have options as to how it's throated.
It's clear from TB's data that when using RL26 the .260 is more efficient because it uses 0.1gr less powder to achieve the exact same velocity as the Creedmoor. This is further proven by the fact that the same charge of RL17 in both cases will give the .260 a 1 fps muzzle velocity advantage over the Creedmoor.
FL resizing does NOT cause incipient case head separation. Incorrect full length resizing does. There is a VAST difference. I would suspect that you would be very hard pressed to find any competitor anymore that neck sizes as a matter of general practice.
Interestingly enough, a google search found this. If you can listen carefully, there is a ton of information here on brass and resizing it. All in about two minutes.
https://youtu.be/ECUcIeak7CM
https://youtu.be/ECUcIeak7CM
Another golden nugget.
“The 6XC (30-degree case shoulder) cartridge came about as a natural progression from shooting the original 6mmX. The 6XC has some features which I feel are more desirable compared to the 6mmX.
The cartridge case body length is 0.023″ shorter than the 6mmX. This means that a 6XC chamber reamer now cuts the base of the case closer to the original .22-.250 base diameter.
Shortening the case body also allows for less longitudinal (length) stretching during fire-forming. This will result in the 6mmXC having a greater case life (more firings).
The 6XC’s 30-degree case shoulder retards case growth (less trimming required).”
-David Tubb
“The 6XC (30-degree case shoulder) cartridge came about as a natural progression from shooting the original 6mmX. The 6XC has some features which I feel are more desirable compared to the 6mmX.
The cartridge case body length is 0.023″ shorter than the 6mmX. This means that a 6XC chamber reamer now cuts the base of the case closer to the original .22-.250 base diameter.
Shortening the case body also allows for less longitudinal (length) stretching during fire-forming. This will result in the 6mmXC having a greater case life (more firings).
The 6XC’s 30-degree case shoulder retards case growth (less trimming required).”
-David Tubb
Yes, really.
I neck size just about everything even my hunting ammo and OF COURSE I check fit ! jmo RJ
???? Rj
Code:
Cartridge : 6.5 x 55
Bullet : .264, 140, Berger Hybr #26414
Useable Case Capaci: 53.358 grain H2O = 3.464 cm³
Cartridge O.A.L. L6: 3.150 inch = 80.01 mm
Barrel Length : 22.0 inch = 558.8 mm
Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 103 %
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 !
28 loads produced a Loading Ratio below user-defined minimum of 85%. 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 RL26 94.7 50.1 3.25 2867 100.0 60000 12959 1.115 ! Near Maximum !
Alliant RL25 103.0 50.4 3.27 2836 100.0 58777 12638 1.114 ! Near Maximum !
IMR 7828ssc 96.7 48.8 3.17 2821 97.6 60000 12953 1.105 ! Near Maximum !
AA MagPro 97.8 51.2 3.31 2809 95.5 60000 13363 1.120 ! Near Maximum !
Alliant RL22 97.6 48.5 3.15 2802 98.6 60000 12845 1.123 ! Near Maximum !
Ramshot Magnum 98.1 52.6 3.41 2800 99.1 60000 12427 1.110 ! Near Maximum !
Alliant RL23 99.8 48.0 3.11 2786 100.0 60000 11626 1.128 ! Near Maximum !
Alliant RL17 85.5 44.1 2.86 2786 100.0 60000 11471 1.126 ! Near Maximum !
Code:
Cartridge : 6.5 PRC
Bullet : .264, 140, Berger Hybr #26414
Useable Case Capaci: 62.379 grain H2O = 4.050 cm³
Cartridge O.A.L. L6: 2.950 inch = 74.93 mm
Barrel Length : 22.0 inch = 558.8 mm
Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 60000 psi, or 413 MPa
or a maximum loading ratio or filling of 103 %
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 !
36 loads produced a Loading Ratio below user-defined minimum of 85%. 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 RL33 103.0 64.3 4.16 2960 94.9 58593 16094 1.139 ! Near Maximum !
Alliant RL25 98.5 56.3 3.65 2949 100.0 60000 13919 1.116 ! Near Maximum !
Alliant RL26 89.5 55.3 3.58 2948 100.0 60000 14170 1.130 ! Near Maximum !
IMR 7828ssc 92.1 54.4 3.52 2927 98.5 60000 14425 1.112 ! Near Maximum !
Hodgdon H1000 102.3 58.2 3.77 2924 98.7 60000 14210 1.104 ! Near Maximum !
Hodgdon Retumbo 103.0 59.6 3.86 2923 99.9 55845 14652 1.134 ! Near Maximum !
AA MagPro 93.1 56.9 3.69 2912 96.7 60000 14911 1.128 ! Near Maximum !
Mark RJ
