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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
hows running 123 amaxes in a dpms 260 rem set up ?
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<blockquote data-quote="Skytow" data-source="post: 1152337" data-attributes="member: 93923"><p>Dug,</p><p></p><p>As already mentioned, H4350 is a great choice for the 123 AMAX and your 260. I'll be doing a ladder test on just this combo in Lapua brass with CCI BR primer later this week.</p><p></p><p>I have a 24" Bartlein on a DPMS pattern custom upper and a modified DPMS lower.</p><p></p><p>I've been running mostly 142 Sierra HPBT and made some great groups. One was 5 shots which were .33 MOA shot @ 200M. I have been using H4831 for the 140's but needed to go to H4350 for the 123's. (you run out of case capacity)</p><p></p><p>Your 1 in 8.5 should stabilize 140's no problem. I have the same twist rate and it runs fine. As to length, see what your mags will hold. I can get to 2.810" and that's it. Guys with bolt guns are running much longer to help with the limited case capacity but not an option for shooting from the mags for SR25 / DPMS style gas guns.</p><p></p><p>My next ladder test will be IMR 7828SC for 142 / 140 g bullets. I do have an adjustable gas block which let's me keep the bolt speed to a minimum while trying all these combinations. I will get odd feeding issues if over gassed. Turn the block down and it runs like a charm.</p><p></p><p>Great round in a very interesting platform!</p><p></p><p>JD</p></blockquote><p></p>
[QUOTE="Skytow, post: 1152337, member: 93923"] Dug, As already mentioned, H4350 is a great choice for the 123 AMAX and your 260. I'll be doing a ladder test on just this combo in Lapua brass with CCI BR primer later this week. I have a 24" Bartlein on a DPMS pattern custom upper and a modified DPMS lower. I've been running mostly 142 Sierra HPBT and made some great groups. One was 5 shots which were .33 MOA shot @ 200M. I have been using H4831 for the 140's but needed to go to H4350 for the 123's. (you run out of case capacity) Your 1 in 8.5 should stabilize 140's no problem. I have the same twist rate and it runs fine. As to length, see what your mags will hold. I can get to 2.810" and that's it. Guys with bolt guns are running much longer to help with the limited case capacity but not an option for shooting from the mags for SR25 / DPMS style gas guns. My next ladder test will be IMR 7828SC for 142 / 140 g bullets. I do have an adjustable gas block which let's me keep the bolt speed to a minimum while trying all these combinations. I will get odd feeding issues if over gassed. Turn the block down and it runs like a charm. Great round in a very interesting platform! JD [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
hows running 123 amaxes in a dpms 260 rem set up ?
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