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VV does list a 140gr ELDM load for 6.5-284 with N565, I can give that a go next range trip, the recoil calculator I plugged it in to shows it should be a noticeable drop in recoil. That could be a good stopgap option until I change barrels.
It's hard not to get caught up in the numbers for things like wind drift, but every time I shoot my 12.5"AR with a 1-8 NX8, the reality of very low recoil is too good to ignore.
The numbers are tempting, but returns quickly diminish.
Using standard atmospherics at sea level and 10 mph full value wind:
-My 16.5 inch 223 with 77 gr TMKs drifts 38.54 inches at 600 yards: at 300 yards a 15 mph gust can push it 12.44 inches off target.
-My 17 inch 243 with 108 ELDMs drifts 24.94 inches at 600 yards: at 300 yards a 15 mph gust can push it 8.38 inches off target.
-A 7mm mag throwing a 175 ELDX at 2900fps, drifts 16.6 inches at 600 yards: at 300 yards a 15 mph gust can push it 5.76 inches off target (which is still to far off to make a shot on a blacktail/goat in those conditions at that range)
There is a 13.5 inch improvement between the 223 and the 243, though the guns wind number only moves from a 3.5 mph gun to a 5 mph gun. There is only a 8.5 inch improvement going from the 243 to a 7 mag even though the wind number jumps to 7 mph with sea level standard atmospherics.
Conversely, the recoil difference between the 223 and the 243 are minimal in regards to effect on shooting for me. Just stepping up to a 308 throwing 178 gr bullets at 2400 fps (short barrel again) noticeable degrades my shooting, the same rifle in a 7 mag with 175s would certainly be even worse.
I got tempted by numbers recently as I have been spending time in the alpine and seeing heavy winds (have 40 mph plus wind gusts on the 4th with a base wind of 15 to 20). But, after chewing it over, if trying to shoot in those conditions with gusts 25 mph over hold, to avoid more than 4 inches of drift and stay in the vitals of a goat I would have to stalk within:
-223: 130 yards
-243: 160 yards
-7 mag: 190 yards
Recoil (same 8 pound rifle)
-223 has 4.1 ft/lbs for my load
-243 has 10.0 ft/lbs for my load
-7 mag has about 26 ft/lbs (my velocity is probably generous and my recoil is probably low for that velocity as I'm using a 7 PRC case capacity)
A 6.5 throwing a 156 Berger EOL at 2900 fps is only 6.5 mph gun at sea level with standard atmospherics.
Recoil is about 21 ft/lbs.
I'm curious what your MV and recoil energy are with your current 6.5-284 as I'm making guesses at charge weight and MV.
Sorry for the long post, my brain still wants a bigger gun to be markedly better, so crunching all the numbers again helps remind me not to chase BC and stay with 243win/6creed sized cases and not chase wind numbers past a certain point due to diminishing returns.
Most of my hunting takes place between -1000 to 5000 foot density altitude. I'm curious if the same relationship holds at 10,000 ft DA, but as it does not apply to me, I don't feel like plugging in the numbers myself.