Broken bolts- thing of the past?

[rwh]

I broke two bolts on the same day loading 27.2 grains of 8208XBR behind a 123 grain Lapua Scenar with a ​CCI BR4 primer and Lapua brass. After that I pulled the bullets and checked the power weight. That load had been fine for me all summer but spiked badly on a hot afternoon in August. I've seen posts on this forum with hotter loads that that on this site. If you push the pressure in a grendel you are bound to break a bolt eventually.