Jump to content
Sign in to follow this  
Andy RV

Powder for 69gr TMK

Recommended Posts

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

 

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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. 

Share this post


Link to post
Share on other sites

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.

 

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

That is almost exactly what I was getting velocity-wise with 23.6 (slightly longer barrel) with equally good results.

Share this post


Link to post
Share on other sites
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. 

Share this post


Link to post
Share on other sites

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. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

safeshot 200.jpg

tacfire 200.jpg

blackrifle.png

jr_firearms_200.gif

valkyrie 200.jpg

RifleMags_200x100.jpg

border_ballistics_UKV_ad.jpg

dolphin button4 (200x100).jpg

CASEPREP_FINAL_YELLOW_hi_res__200_.jpg

rovicom200.jpg

BHTargets200.jpg

Lumensmini.png

CALTON MOOR RANGE (2) (200x135).jpg

bradley1 200.jpg

NVstore200.jpg

Danny Trowsdale 200.png

tab 200.jpg



×

Important Information

By using this site, you agree to our Terms of Use and Privacy Policy