260 Rem loads

[nvbroncrider]

I imagine you might run into capacity issues with the 7828/RL22's. Not saying they wouldn't be good in a case that would take them, but in some cases, you might run out of case before you get up to speed. I would think RL19/4350's would better for them. Same thing happens with the Swede. While 22 and 7828 show great numbers on QL, you run outta space too fast.

Yes it does with the Swede. Especially with the 125 PT you don't have enough neck to securely hold the bulet and cram all that powder in. In order to hold that bullet I can only load to 3.100". Still 2950 is no slouch.

 

[SJB358]

Could someone with quick load please run the 140 amax with H4831sc and H4350 for me with 24" barrel? Weather is possibly going to break a bit Sunday afternoon so I might be able to get out and get the new rifle broken in!

Thanks,
Tim

Tim, here is H4831..

Cartridge : .260 Rem
Bullet : .264, 140, HDY A-MAX 26322
Useable Case Capaci: 43.725 grain H2O = 2.839 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4831 SC

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 94 38.50 2386 1769 38566 8169 89.0 1.466
-09.0 96 38.93 2414 1812 39885 8285 89.6 1.443
-08.0 97 39.36 2443 1855 41254 8400 90.2 1.420
-07.0 98 39.79 2471 1899 42675 8513 90.8 1.398
-06.0 99 40.21 2500 1943 44151 8623 91.4 1.376
-05.0 100 40.64 2529 1988 45684 8732 91.9 1.355
-04.0 101 41.07 2558 2034 47277 8838 92.5 1.334
-03.0 102 41.50 2587 2081 48934 8941 93.0 1.313
-02.0 103 41.92 2616 2128 50657 9042 93.5 1.292
-01.0 104 42.35 2645 2176 52449 9140 94.0 1.272 ! Near Maximum !
+00.0 105 42.78 2675 2224 54315 9236 94.5 1.252 ! Near Maximum !
+01.0 106 43.21 2704 2273 56258 9328 94.9 1.233 ! Near Maximum !
+02.0 107 43.64 2734 2323 58283 9417 95.4 1.214 ! Near Maximum !
+03.0 108 44.06 2763 2373 60393 9503 95.8 1.195 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 44.49 2793 2425 62594 9586 96.2 1.177 !DANGEROUS LOAD-DO NOT USE!
+05.0 110 44.92 2822 2476 64891 9665 96.6 1.158 !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 105 42.78 2822 2475 65364 9359 99.0 1.159 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 42.78 2489 1926 44523 8667 86.3 1.371

Here is H4350

Cartridge : .260 Rem
Bullet : .264, 140, HDY A-MAX 26322
Useable Case Capaci: 43.725 grain H2O = 2.839 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4350

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 93 36.55 2447 1862 42703 8076 95.0 1.412
-09.0 94 36.96 2473 1902 44057 8168 95.4 1.392
-08.0 95 37.36 2499 1942 45450 8258 95.8 1.372
-07.0 96 37.77 2525 1982 46882 8345 96.2 1.352
-06.0 97 38.17 2551 2023 48358 8430 96.6 1.333
-05.0 98 38.58 2577 2064 49881 8512 96.9 1.315
-04.0 99 38.99 2602 2105 51453 8592 97.3 1.297 ! Near Maximum !
-03.0 100 39.39 2628 2147 53077 8670 97.6 1.279 ! Near Maximum !
-02.0 101 39.80 2654 2189 54753 8744 97.9 1.261 ! Near Maximum !
-01.0 102 40.20 2679 2232 56483 8816 98.1 1.244 ! Near Maximum !
+00.0 103 40.61 2705 2275 58271 8885 98.4 1.227 ! Near Maximum !
+01.0 104 41.02 2731 2318 60118 8951 98.6 1.210 !DANGEROUS LOAD-DO NOT USE!
+02.0 105 41.42 2756 2361 62027 9015 98.8 1.193 !DANGEROUS LOAD-DO NOT USE!
+03.0 106 41.83 2782 2405 64000 9075 99.0 1.177 !DANGEROUS LOAD-DO NOT USE!
+04.0 107 42.23 2807 2449 66039 9131 99.2 1.161 !DANGEROUS LOAD-DO NOT USE!
+05.0 108 42.64 2832 2494 68148 9185 99.4 1.146 !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 103 40.61 2817 2468 68704 8686 100.0 1.146 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 103 40.61 2553 2026 48063 8670 93.0 1.332

 

[SJB358]

I imagine you might run into capacity issues with the 7828/RL22's. Not saying they wouldn't be good in a case that would take them, but in some cases, you might run out of case before you get up to speed. I would think RL19/4350's would better for them. Same thing happens with the Swede. While 22 and 7828 show great numbers on QL, you run outta space too fast.

Yes it does with the Swede. Especially with the 125 PT you don't have enough neck to securely hold the bulet and cram all that powder in. In order to hold that bullet I can only load to 3.100". Still 2950 is no slouch.

Without a doubt Jake, 2950 with a 125 PT is trucking for sure. That is just about everything a 270 Win can do and with the little extra BC you get, they are pretty close to equals in that bullet weight.

 

[shoots_5]

Thanks Scott. That prediction seems a little low to me with the 4831. Will be interesting to see where it maxes out and starts to show pressure. How much does COAL change the data in QL? Just curious as these will be seated out at 2.865 if memory serves me correctly, which is just off the lands. I've read loads from guys using 46+ grains and was planning on starting around 44 grains. Wondering if I need to start lower or not?

(edit)
I just looked at a differnent thread where Mike posted that the Hornady manual lists 46 grains as max for that combo. Ok, so I think I'm sticking with starting at 44 grains or so and working up. I'm curious to see which is going to shoot better between the 4831 or 4350. Both seem to be very popular options with this round. It seems that the velocity edge goes to the 4831 but at the expense of compressed loads. We'll see what pans out in real life....

 

[257 Ackley]

You may want to try a magnum primer with some of the compressed loads and see if that makes any difference as well. Are you using brass with LR or SR pockets?

 

[shoots_5]

Using Remington 260 brass . And cci 200 primers to start

 

[257 Ackley]

You have spent some good dollars on a rifle meant to shoot tiny groups at long distances. Spend the few extra dollars for Lapua brass. You will eliminate a huge variable and have brass that will be able to be fired many more times than the Remington crap. You will find huge differences in weight with the Remington brass once you start sorting it. For regular hunting rifles this isn't as big of a deal when you are shooting "minute of deer or elk", but it will be at 600 plus yards at a steel plate or X-ring on a target.
I'm sure you are planning on testing other primers as well (you should unless the CCI 200 shoots .5 moa groups). The only primers I tested in my 260 were BR2's and 210M, so I have no data on how they would perform, but there is a reason why the benchrest guys use match primers in most cases.

 

[SJB358]

I am with Joel, check out the Lapua brass. It is tough and will likely last twice as long as the RP brass, so you kinda pay the same thing anyhow.

If you tweak the seating depth, it'll change the speeds a little, also raising the MAX PSI will also increase the speeds.. I think your right to start where you are and work up slowly. Pretty sure your rifle will tell you all the info you need to know. QL and books are just a good spot to pick powders, hardly ever does speeds come out close.

 

[shoots_5]

I will pick up some lapua brass at some point. I am fully aware of the quality differences between the two. And while I do expect this gun to shoot little bitty groups, it was not built to be a bench rest gun. I have both br-2 and 210m primers. I almost always start with the regular primers though and often times find that they shoot really well. Unfortunately the testing will have to wait. The weather was really nasty with wind and rain so I decided to hold off until the conditions wouldn't mask any potentially good loads.

 

[257 Ackley]

check out the Lapua brass. It is tough and will likely last twice as long as the RP brass, so you kinda pay the same thing anyhow.

I have Lapua 6BR brass that was shot over 10 times last summer (30 grains of Varget behind a 107 SMK) with a hot load that has primer pockets still as tight as they were new. This might not be as good as a LR primer pocket since there is less brass around the pocket, but it will still be better than any US made brass. The biggest thing though is the consistency of the brass for weight. I anneal after the third firing and use bushing dies that bump the shoulder back 1/1000th, and have yet to need to trim after the initial trimming. The 6.5X47 brass has been fired twice now with the same results (100 cases).

Good luck with the range time once the weather changes. It was 35 degrees with fog and wind gusts up to 15mph out of the SE yesterday when I was at the range. I was just happy that it wasn't 0 degress with 12 inches of snow on the ground! :grin:

 

[shoots_5]

Thanks Joel. It's on the Christmas list! I know I love my lapua brass for my 338 lapua. I did read a few reports of loose primer pockets on the Lapua 260 brass after 4-5 firings but I'm guessing those guys are running loads well over pressure. Hopefully I'll get a day off when it's not pouring down rain sideways and actually get to go shoot...although this is Oregon so that might not be until June!