Has anyone had any experience with any of these combo's
Don't take anyone's word when it involves your head and arms around the rifle
So if any of us have experience what good will it do to post it, referring to the bottom quote.
After reloading for 40+ years, I've found that the use of magnum primers is not really needed unless you have a huge case of powder to ignite or it is really cold. I know that this goes against the thoughts of some, but it is what I have found to be true.
I have loaded IMR 4831, IMR 7828, IMR 4350, H450, RL19 and others with LR primers in .243 Win, 25/06, 270 Win and 30/06. I had good results accuracy and velocity wise. I've used LRM primers in those same loads with very little difference in either accuracy or velocity, at most you may see a few FPS faster with the LRM primer. Of course you should back down a little on the charge for the LRM. That really only applies when you are getting close to a max load.
If you are using a middle of the road load for say the 25/06 and you run out of LR primers and you have some LRM and load those, I bet most folks would never know which was which as far as accuracy or velocity. Now if you were at max then you could see over pressure signs and would need to reduce the charge.
I advise caution when swapping componants, but there is a lot of BS out there as far as primers go. Be careful!
Jimmy K