I would not be afraid to use the 61.5 load at all but would test in warmer weather first. We do hunt in 90 degree weather here. My 280AI with a 25" barrel and R26 will out run my 7RM with 23 inch tube by up to 50 fps. with 160s. With the 175 grain pills the 7RM holds it's lead over the 280AI.
I ran up to 62 & 63 grains before seeing any pressure signs
in the AI with 160s and this was at 90 degrees. Mine is throated long for the 175 gr. Sierra so almost free bored with 160s.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
| 
