#1
|
|||
|
|||
20-250 load work up
Hey there guys.
I have just got my rem 700 re-barreled to 20-250 11 twist Krieger #5, krg xray stock to shoot 40 grn projectiles, all groups were shot at 200 yards. I am having trouble getting consistency with group sizes. I have shot the odd group around 1 inch but a lot more around 3 or 4 inches. Bedding should be good as the xray is said to have a v-block bedding system that does not require any bedding. I have been shooting 40 grain nosler balistic tips at .02 off touching and have so far tried AR2209 (H4350) and AR2208 (varget). I was told to try a faster powder and was thinking AR2206H (H4895). Could anyone suggest a starting load with AR2206H (H4895) please ? And any other suggestions would be greatly appreciated as well. Thanks |
#2
|
|||
|
|||
20-2250 load work up
You might give the 39 grain bullet, i.e. Sierra's BK at go. Many 20 cal shooters have found the 40 will not work well, with the 1/11 twist, but a 39 grain does. Just a thought. Bill k
|
#3
|
|||
|
|||
I'm using a 11 twist bartlien on a tikka t3 and I'm also shooting a 40grain bullet. I started out trying imr4350 and got some good groups but the speed wasn't there. I switched to vv550 and everything came together nicely with speed and better groups. There is some nice reference material provided by a member on his website, I think it's called coyote stuff.com.
Last edited by pmg; 11-05-2017 at 02:44 PM. Reason: Spelling |
#4
|
|||
|
|||
Thanks for the help and suggestions so far.
I've also read the coyote stuff but unfortunately down here in Australia we don't get VV powder any more. I might try the powder change I spoke about before and try some different projectiles (39grn BK) and see what happens next. |
#5
|
|||
|
|||
Varget worked best with my rifle. I made a second, faster twist barrel for the 55 gr Berger that is still unfired.
The 20 BRX I had made prior seemed a better idea in retrospect , it was much easier to get to shoot accurately. |
#6
|
|||
|
|||
Your 11T is just fine for 40gr bullets. Its the 12T's that have problems with them. This data is from quickload. I haven't shot 40's in mine so proceed with caution. IMR4895 looks like its gonna get more speed. Don't know if you can get that there though.
Aaron Cartridge : .20-250 Rem. Bullet : .204, 40, Nosler BalTip 52111 Useable Case Capaci: 41.044 grain H2O = 2.665 cm³ Cartridge O.A.L. L6: 2.350 inch = 59.69 mm Barrel Length : 24.0 inch = 609.6 mm Powder : ADI AR 2206H 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 72 27.20 3209 915 31799 9090 90.3 1.234 -18.0 74 27.88 3284 958 33824 9360 91.5 1.205 -16.0 75 28.56 3358 1002 35964 9621 92.7 1.176 -14.0 77 29.24 3432 1046 38226 9872 93.8 1.143 -12.0 79 29.92 3505 1091 40615 10112 94.8 1.111 -10.0 81 30.60 3578 1137 43139 10340 95.7 1.080 -08.0 83 31.28 3651 1184 45805 10555 96.5 1.051 -06.0 84 31.96 3723 1231 48620 10757 97.3 1.022 -04.0 86 32.64 3795 1279 51593 10945 98.0 0.994 -02.0 88 33.32 3865 1327 54734 11117 98.5 0.968 +00.0 90 34.00 3936 1376 58052 11273 99.0 0.942 ! Near Maximum ! +02.0 92 34.68 4005 1425 61558 11413 99.4 0.918 ! Near Maximum ! +04.0 93 35.36 4074 1474 65263 11536 99.7 0.894 !DANGEROUS LOAD-DO NOT USE! +06.0 95 36.04 4142 1524 69181 11640 99.9 0.871 !DANGEROUS LOAD-DO NOT USE! +08.0 97 36.72 4209 1574 73325 11726 100.0 0.849 !DANGEROUS LOAD-DO NOT USE! +10.0 99 37.40 4275 1624 77711 11795 100.0 0.828 !DANGEROUS LOAD-DO NOT USE! |
#7
|
|||
|
|||
Wow I wish I had quickload, it looks awesome.
I am getting the velocity I want with AR2208 (Varget) but I am struggling to get it to group. Might stick with 2208 for now and change projectiles first. I wonder if W748 would be too fast ? It has a 26 inch barrel so maybe I can get a bit moreout of the 2206H ? Really frustrating. I have access to all ADI powders and some relaoder powders as well, any recommendations ? |
#8
|
|||
|
|||
RL15 is similar in burn rate to Varget. I'd try that one.
Aaron |
#9
|
|||
|
|||
Take Aaron advice on the RL15 works awesome in my 20 Nitro.
|
#10
|
|||
|
|||
8208, AA2520, are other powders to think about.
Last edited by L.Sherm; 11-06-2017 at 11:18 AM. |
Thread Tools | |
Display Modes | |
|
|