Not quite an old geezer yet ..won't hit 70 for a few more months. I've been using a 7 rem mag since '64 and, at first thought it was truly the greatest thing since sliced bread.
Then as real world experience started to set in I found that there was precious little difference between the 7 mag, 270 win, 284 win, 308 win, or 30-06 etc. .especially if Nosler Partitions (more recently TTSX) were used. Hit-em right and stuff just (quickly) dies . Today, my 270 using 62 gr of RL 26 and a 150 NP is about all I use. So far haven't found a deer or elk that could tell the difference.