So damn true...sadly with maybe April being also a bit larger and August even smaller. I definitely gravitate towards Hawaii in December thru February...but then when the muddy breakup happens, I am ready to go somewhere in April too.
You absolutely need a 505 Gibbs, at least once and for an epic hunt like you plan...but I wouldn't prove surprised if you find the recoil less than fun. I find my 500NE double far more pleasant to shoot than my 505 Gibbs. Both rifles are on the heavy side. My 500NE is a Heym 89b on a grossbox frame and 26" barrels, weighing in a 12lb 4oz. Pure joy to shoot, even with 600gr bullets in the 2050fps range, or 570's in the 2100-2150fps range. My 505 is also heavy, based on a GMA action and one of the original barrels GMA milled from an oversized Krieger blank with integral 1/4 rib, sling band, recoil lug and banded sight, in one of Ryan Breedings custom fiberglass stocks. It's well over 12lb with a 1-8 Z8i on it, it has Smithson quick release scope mounts...trying to recall, but think its around 11+ lb bare. It will wallop you with 600gr bullets at 2100fps, even at the same 2050fps as my 500NE. The recoil pulse seems faster or something. I can easily shoot few dozen loads through my 500NE and several days in a row. With the 505, I'm good after 6 or so. Not hurting or anything, but happy to put it down. I do want to take it to Uganda and smack some buffalo with it...and next trip to Kotz for moose/bear, I may have to bring it. I need to get a Swara Z6 1-6 EE scope on it though. While I haven't scoped myself with it, I've had it kiss my eyebrow more than once, and knocked my ball cap off a time or three. Its a lot more fun to shoot with the irons, but laser accurate out well past 200yrds.