A couple questions about some of the newer Alliant powders. I have used RL17 and RL23 but have been unable to find any RL16 & RL 26 until now. I have the 2018 Alliant and there really isn't much data for either rl 16 or rl 26. There is some RL 26 data for the 270 WSM that looks promising.
Has anyone used RL16 or RL26 with good performance and accuracy ? Any comparisons in loads between RL15 & RL 16. Would appreciate any comments you can share about your experience with these powders.

I have not used any of these newer powders, but go to the Alliant website at http://www.alliantpowder.com/products/rifle.aspx and click on whatever powder interests you. On the screen that comes up click on "view all (this powder) recipes" which will show you all data with every cartridge Alliant has developed for that powder.

The printed guide that I have is the same data that is on-line. I was hoping there was some personal experience out there.

I tried some R26 in my 270WSM and my brothers 28 Nosler. I got better accuracy with R22 and Retumbo in my 270 WSM. My brothers 28 Nosler did not like R26 at all. It likes H1000 and Retumbo.

I used 56.5gr Of RL16 in my 270 Winchester and
got 3368fps with Barnes TTSX at 3.260 OAL with
Winchester case. WLR primers. Most accurate RL26
load was in my 30/06 65gr of RL26 gave 3027fps
with Trophy bonded tipped 165gr bullets. 215M
primers win cases at 3.280 OAL. Or 65gr of RL26
with 165gr Ballistic Tipps at 3008fps. 215M primers and win cases 3.280OAL. RL16 load was with 110gr TTSX bullets in a 270 Winchester

I got some very encouraging first time results with Rx16 in 30/06 with 150 and 180gr bullets..

https://www.shootersforum.com/...%3B-150gr-180gr.html

In my 30/06 59.0gr of RL16 gave 3096fps with
150gr Accubonds. In my 338 Win Mag I used 71gr
of RL16 and got an average of 2953fps with
210 Nosler Partitions win case 215M primers
and 3.260 OAL.

I found some data for RL16 over on the 6.5 Creedmoor forum that shows 40-43.3 gr for a 140 gr bullet.
I haven't had a chance to use it yet but have some loaded to try.

I've had good luck with RL16 with some 180gr Scirocco 30-06 loads, Not done yet.

Going to try for my 358 Norma.

Shot some more 65gr RL26 loads for 30/06
with 165gr bullets. Think I,d change that
load max. to 64gr of RL26. Always start low and work up for your rifle.

I've used RL26 in a 300wm and the velocity has been very fast. 3200fps with a 180AB.
I've tried several nodes but can't seem to find the sweet spot for accuracy and the ES hasn't been consistent in my rifle.