Neither RL19 nor H4350 really gave me what I was looking for (although the latter is close) in my 270wsm..
I just ran my first set of RL17 loads at the range today. Regarding this particular 270wsm I own, which has been a real bugger to find a load I like for, I for the first time today saw some consistency that I liked using the RL17 and 130gr accubonds.
To compare, in this rifle I can run the 130gr accubond in front of 63gr H4350 and it runs 3395 over my chrony with a low SD. In my gun this is approaching the max load from watching the signs. The grouping is fine, but I've just been wanting to keep looking for more, if you know what I mean. Despite the low SD the groups just aren't real consistent.
So, how did the RL17 do? Pretty good, actually. So far I ran it up as much as 62gr for 3350, and 63gr for 3380. While the SD isn't quite as low as with the H4350, the groups are more consistent and tighter- the first time I've ever seen consistency in this darn thing! I can tell that there's still some headroom in the load as well, so I'm going to go back for more and start to creep up in smaller increments while watching for sign.
So, is RL17 getting me that magical extra speed? Not in this gun it isn't. However, at around the same speed the extra consistency is welcome.
Maybe someday I'll try it in my 300wsm to check for speed. Probably after I shoot up my sweethart load though in case I like what I see more.