I am only just North of 47. I wish I had your opportunities to hunt. I am building a .22-6.5X47 with an 8 twist. I am waiting for Krieger to make the barrel. I like their deep 10 groove fluting compared to other makers. The point of this chambering it to have a small rifle primer behind about 40 gr of powder. Slightly less than the .22-250 AI. I will sacrifice my .22-250 Ackley die to make the size die for this one. I will use the reamer to build a Wilson seater.
What powder and primer configuration are you using with 75 and 80 gr VLDs in the .22-250 AI? What are your velocities? I have never had a .22 centerfire that would twist the heavier bullets.
I like the 6.5 Swed Improved cartridge because it has a longer neck than the .260 Remington. How much of which powders are you using? Give me some idea of the volume. My guess is that the neck length and volume make it very close to the 6.5 Creedmore. I still think that the 6.5-284 will beat by a lot. I get 3280 (instrumental) comfortably from 58 gr of VV N-560 with the 130 Accubond 26 inch barrel. That is right at 3300 at the muzzle.
Location: I live in Canada on the prairies and shoot 5 or 6 deer a year.
Re: 6.5x284 vs .220 swift
First off lets get all the disclaimers out of the way. The loads I list here are ones that I have used and I make no claims that they will be safe in any other gun.
I use CCI B2 primers with 42 grs RL19 with WIN brass, 80 gr A-Max and get 3300 ft/sec with my 22-250. I use the same load with 75 A-Max and run just under 3400 ft/sec.
The most accurate load I have found is 42 gr RL22 under a berger 80.5 gr running just under 3200 ft/sec.
The 80gr A-Max is the one my wife uses on deer, and yes we can use a 22 cal on deer here. The 80 gr A-max hits very hard out to 400 yards with this load and with a muzzle brake on it she does not even feel it. I know there can be lots said about the good or bad of a muzzle brake but my wife likes it when she shoots. So all I can say to those that don't like muzzle brakes is "happy wife , happy life" so I will keep the brake on.
For my 6.5 improved I run 130s at 2950 ft/sec over 52 gr of n165 for hunting out of a 20" barrel and for F class I run 140 JLKs at just over 3000 ft/sec over 52.8 gr of n165. I can go a little faster but can't reach the next accuracy node so I stay around 3000 ft/sec.
If pushed to buy either, I'd go with the .220 Swift.. Few reason's here, (1) I'm not a Mauser fan (2) not a ER Shaw barrel fan (3) no way to quantify actual rounds through barrel. (4) Remington 700 is brand new (5) it's a great deal (6) you should be able to get your money back, plus some, if you decide to sell it later on.
With all that said, I own a 6.5-284 and love it but IMO it shines with heavy bullets (120-142gn) which have high BC's for shooting 500yds and beyond. Great for bigger game.
Just an FYI, today at lunch in a local gunshop I found two Remington 700's SF, one a Sendero in .300 RUM, the other a VS in .223. Price tag's were $1175.00 and $1149.00, respectively. That Swift is a great deal! JohnnyK.