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If using Hodgdon superprofrmance in the summer months at near max take care as it is prone to pressure spikes if your rounds are left at the range in the sun.

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In my .260 I use 1 grain more of RL26 compared to superprofrmance for same fps both group well superprofrmance is not as stable in warm temp.

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I use federal 215 magnum primers in all my large rifle caliber's.
I know@Kelton is using RL26 and the 156 Berger in his 6.5 SAUM and I've just given him some 142 LRAB to try.
I'm using them in my...

That Hodgdon superprofrmance is dam good powder I use it in the .260 as well with good speeds

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What length barrel are you running?

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I'm picking you will push them faster than that with a 22"

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Only thing to watch is superprofrmance is a bit temp sensitive in mid summer if you are at the top end it will give you pressure issues

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I know it's not a PRC but both those powders work well in a .260 with me being able to load 1.7 grns more RL26 than superprofrmance for 2880fps with 26 and 2843fps with superprofrmance but this is...