Rl16 with 6.5 creedmoor

[Mike 338]

Are you running a small firing pin or a standard sized pin?

Not sure. Savage model 11 Long Range Hunter.

 

[Mike 338]

Gonn'a try some different primers. I hear CCI 450's have a harder cup.

 

[Barrelnut]

Gonn'a try some different primers. I hear CCI 450's have a harder cup.

True. I use the CCI450 with my Savage with 6.5 CM Lapua brass and 42.6 gr of H4350. I have taken it .5 Gr. higher, and started to get ejector marks. So backed off, but never had a primer issue.

 

[Joefrazell]

Has anybody got as good of accuracy with rl17 as h4350? My rifle didn't shoot too well with it and 143 eldx bullets.

 

[Creedmoor shooter]

Has anybody got as good of accuracy with rl17 as h4350? My rifle didn't shoot too well with it and 143 eldx bullets.

Rl-17 has been my go to for a while now. It gives great speeds. I recently picked up rl-16 to try. Rl-17 velocities change too much with temps. These are a couple of my best groups I shot with rl-17, adg brass. First at 100 and the last at 1354 yards. Couldnt duplicate that again even if I wanted to at 1354 yards. I've had several groups in the .1s at 100 yards(3shot). Velocity on those were 2823 fps with a 140 eld-m

 

[Mike 338]

Well, I shot 6 different primers with 42.0 gr. of RL-16 behind Hornady 143 ELDX and Lapua small primer brass. Remington 6-1/2 and CCI 400 all pierced the primers. Winchester Small Rifle, CCI 450, Federal 205 Match and Remington 7-1/2 Benchrest all made it through without piercing the primers. Winchester Small Rifle produced the best accuracy but that doesn't mean anything because the WSR primers were sort'a the benchmark I was using to determine max load anyway. I'm obviously beyond a safe powder charge with this bullet/case/powder combination.

All the conventional wisdom out there say's that RL-16 is in the 4350 burn rate but I have taken H-4350 well above 43 grains without any pressure issues. So do I have a "hot lot" of powder, a defective gun, a dinked up powder scale? Well, who knows right now but this is a great example why you don't assume internet wisdom is necessarily accurate. Always start low and work your way up. The Alliant website recommendation for max load for 142 SMK with this caliber/powder is 43.9 gr. In my gun, that load probably would have blown up in my hands and face. Just say'in... start low.

 

[Barrelnut]

All the conventional wisdom out there say's that RL-16 is in the 4350 burn rate but I have taken H-4350 well above 43 grains without any pressure issues. So do I have a "hot lot" of powder, a defective gun, a dinked up powder scale? Well, who knows right now but this is a great example why you don't assume internet wisdom is necessarily accurate.

Got some more internet wisdom, ya might want to consider.
The two powders might have be close in burn rate, but might be different in energy density. Some powders have more energy per grain. They can even have different pressure curves. This is why RL17 and RL26 offer speed increases, they have higher energy density and longer powder curves.

 

[Barrelnut]

Bowfishn - Hate to ask - but could you do a quick load report for:
RL16, in the 6.5 Creedmoor Lapua case, with the 143 ELDX
Maybe Mike is pressuring out because of the lower capacity of the Lapua case.

 

[Creedmoor shooter]

Bowfishn - Hate to ask - but could you do a quick load report for:
RL16, in the 6.5 Creedmoor Lapua case, with the 143 ELDX
Maybe Mike is pressuring out because of the lower capacity of the Lapua case.

I pressured out way sooner with peterson and adg than I did hornady and lost velocity with both. Give my rifle hornady brass and rl-26 and it thinks it's kin to a 6.5x284

 

[Bowfishn]

Here it is with Lapua Brass 51.5 gr H2O capacity. 2.800" COAL
Note the pressure increase from lot variation with just 42 gr. with a 10% increase.
Your velocity should show what is happening. Also I would need Mikes actual COAL to run the numbers.

"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 106 42.00 2929 2723 78320 8929 100.0 1.098 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 42.00 2692 2301 51206 9737 99.0 1.292"

Cartridge : 6.5 Creedmoor Hornady
Bullet : .264, 143, Hornady ELD-X 2635
Useable Case Capaci: 44.270 grain H2O = 2.874 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-16

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.19% 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

-11.9 93 37.00 2526 2025 43076 8773 99.5 1.409
-10.7 94 37.50 2558 2077 44842 8849 99.7 1.383
-09.5 96 38.00 2589 2129 46685 8919 99.8 1.359
-08.3 97 38.50 2621 2181 48608 8982 99.9 1.334
-07.1 98 39.00 2652 2233 50611 9039 100.0 1.311
-06.0 99 39.50 2683 2286 52706 9089 100.0 1.287
-04.8 101 40.00 2714 2339 54878 9136 100.0 1.265 ! Near Maximum !
-03.6 102 40.50 2745 2392 57131 9182 100.0 1.243 ! Near Maximum !
-02.4 103 41.00 2775 2446 59475 9227 100.0 1.221 ! Near Maximum !
-01.2 104 41.50 2806 2500 61917 9272 100.0 1.200 ! Near Maximum !
+00.0 106 42.00 2836 2554 64462 9315 100.0 1.180 !DANGEROUS LOAD-DO NOT USE!
+01.2 107 42.50 2866 2608 67115 9357 100.0 1.160 !DANGEROUS LOAD-DO NOT USE!
+02.4 108 43.00 2896 2663 69881 9398 100.0 1.140 !DANGEROUS LOAD-DO NOT USE!
+03.6 109 43.50 2926 2718 72766 9437 100.0 1.121 !DANGEROUS LOAD-DO NOT USE!
+04.8 111 44.00 2955 2773 75777 9476 100.0 1.102 !DANGEROUS LOAD-DO NOT USE!
+06.0 112 44.50 2985 2829 78921 9513 100.0 1.084 !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 106 42.00 2929 2723 78320 8929 100.0 1.098 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 42.00 2692 2301 51206 9737 99.0 1.292

 

[Mike 338]

Hmmm, that's some pretty good software. Just about exactly right. I'll have to put it through a magnetospeed and see how close it matches up.