Andy RV Posted March 25, 2018 Report Share Posted March 25, 2018 Gents, Can you recommend a suitable REACH compliant powder for 69gr TMK's out of my 1-8" Sako .223? I've found an accurate load with RS50 at 24.5gr but velocity is quite low at 780 m/s. I need a propellant with a higher energy content and faster burn, RS40 looks like a good candidate?.. Andy Link to comment Share on other sites More sharing options...
meles meles Posted March 25, 2018 Report Share Posted March 25, 2018 If you want to stick with RS powders, they have some load data at https://www.reload-swiss.com/en/reload_swiss/service_2/rs_kundenladedaten/index.php?kaliber=223+Rem.&pulver=-&hersteller=- RS40 does seem to be popular... Does absolute velocity matter, or will you trade it for accuracy ? Link to comment Share on other sites More sharing options...
bradders Posted March 25, 2018 Report Share Posted March 25, 2018 RS52, between 24-25gns Link to comment Share on other sites More sharing options...
VarmLR Posted March 26, 2018 Report Share Posted March 26, 2018 I use RS50 for the 69 TMK with decent results. You say velocities are low...I'm getting close on 2900fps without any pressure signs....2560fps seems quite low! I was using 23.6gr N140 prior to this for 2830fps. Max recommended load in a 69 (hpbt) is 25.6gr RS50 according to RS load data and I've so far found their quoted velocities quite low compared with what I actually get from my barrel. Link to comment Share on other sites More sharing options...
Andy RV Posted March 26, 2018 Author Report Share Posted March 26, 2018 Yes 2560 f/s is quite leisurely! I've just read your thread on 69gr TMK, interesting... My 20" barrel won't help but I did expect a higher result. The pressure for the highest RS50 load is low at 3250 bar meaning case capacity runs out before high pressures are encountered. In my experience with 5.56mm NATO using Nitrochemie (RS) & PB Clermont (Ram Shot) propellants with 62gr bullets 3600 - 3700 bar is normal at ambient temperature. I'll get a bottle of RS40 sometime soon and see what that gives me. Link to comment Share on other sites More sharing options...
VarmLR Posted March 26, 2018 Report Share Posted March 26, 2018 You may be losing over 100 fps compared with my results as they were with a 26 inch barrel. I see that they list RS40 as suitable for everything up to 77gr bullets, and you may get better results with the higher energy powder with a shorter barrel. That or the double base RS52? Viht N140 works very well too with the 69gr bullet weight. Link to comment Share on other sites More sharing options...
deadcenter Posted April 13, 2018 Report Share Posted April 13, 2018 I use N-140 with great results. 24gr is what works for me, 26" barrel, 2750fps. Shot this combo out to 600 metres with great results. No pressure signs and seems kind to the Lapua brass. Link to comment Share on other sites More sharing options...
VarmLR Posted April 14, 2018 Report Share Posted April 14, 2018 That is almost exactly what I was getting velocity-wise with 23.6 (slightly longer barrel) with equally good results. Link to comment Share on other sites More sharing options...
Andy RV Posted April 14, 2018 Author Report Share Posted April 14, 2018 Cheers guys, I bought a tub of RS40 this morning, I’ll report back when I’ve tested some loads. Link to comment Share on other sites More sharing options...
duke Posted April 15, 2018 Report Share Posted April 15, 2018 On 25/03/2018 at 3:34 PM, Andy RV said: Gents, Can you recommend a suitable REACH compliant powder for 69gr TMK's out of my 1-8" Sako .223? I've found an accurate load with RS50 at 24.5gr but velocity is quite low at 780 m/s. I need a propellant with a higher energy content and faster burn, RS40 looks like a good candidate?.. Andy I use rs52 with good effect. Link to comment Share on other sites More sharing options...
Andy RV Posted April 15, 2018 Author Report Share Posted April 15, 2018 I tried 23, 23.5 & 24gr of RS40 this morning and they all shot very well. I’ve loaded up some more at 24gr to test over the magnetospeed next weekend. Link to comment Share on other sites More sharing options...
Andy RV Posted April 18, 2018 Author Report Share Posted April 18, 2018 Well 24gr of RS40 gave me a mean MV of 925m/s, that’s more like it! Link to comment Share on other sites More sharing options...
bighairyhaggishunter Posted March 4, 2019 Report Share Posted March 4, 2019 .223 20" tikka varmint 23gr vit 133 getting 2824 FPS from 69gr tmk and no pressure signs cheers Link to comment Share on other sites More sharing options...
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