My HEAVY 270 smooches 105 Booger Highbirds square, at 2.545" COAL.
Hornie 105 HPBT's at 2.490" smoochin' likewise.
My Itty-Bitty smooches the 105 'Max at 2.475".
If only for perspective,because it never ain't not intellesting. With a miserly sub 25grs of powder and a like zero with the 105 Hornie HPBT,the 270 will kick the schit outta FGMM 175SMK's in both drop and drift...for them enthralled with M118LR-ish baselines. It REALLY stomps the fhuqk outta M852/FGMM 168SMK's. Hint.
The Booger will slip atmospherics a touch better,but Hornie's rugged/reliability and logistics is veddy veddy tough to whoop. The 105 JLK is slicker yet,but production volume is spotty at best. Pass the Hornie BTHP by the bushel,for Utility. Hint.
As mag constraints/mods go...it's no different than 223/223AI box tweaks. Simply smooch your most slickery projectile,toss yourself room to chase lands and move the shim to that locale. On 223,223AI and 270 I like to shim the aft. On 6BR,the fore portion of the box. Hint.
Montucky rearward 223AI aluminum 'box shim. Lotsa ways to do it,but start at the fhuqking start. Hint.
Montucky 6BR box for conversation,with both fasteners and epoxy workin' in conjunction. I'm a purty big fan of schit stayin' put. Hint.(grin)
No thang to arrange whatever you wish ala DBM and AM steel 5-rounders. Poke a couple empties in the well and punch,carve or whittle COAL as requisite...less disassembly. 10 second "job". Hint.
Montucky 270(shot the OEM 223 spout out) and have prolly only broken (3) mag springs in it,as nobody makes a good S/S one that'll weather. I go through more than a few in 700's too,so it ain't a Manufacturer quirk and in fact I prefer the 700 spring/milled follower(s) in Montucky bellies. OEM spacer slid to stern,in order to grant requisite COAL. Hint.
Itty-Bitty with the Illuminatti,will 100% reliably blow fhuqking minds at dastardly distant zipcodes. Only have a coupla more thousand 105 'Max to whistle through and then it'll simply be the 105 Hornie BTHP in everything,just because they ROCK.
A 20" MR contour wearin' a short shank,twisted 8" and punched 270 in a McMillan MR handle,would cover a fhuqking schit ton of opportunity,less batting a fhuqking eye.
6X MQ goes without sayin'...just sayin'.
Hint.