mnguy19 wrote:I may be a touch old fashioned, but I prefer to hunt with iron sights, so I likely won't be reaching out that far anyway.
You 'n I, both! ... I've got a peep on my .338 MX!

... I've also shot it (
benched) at 300yd ... with good results! It's remarkable how accurate a good peep, can be!
Some of 'em also come with replaceable apertures ... at which, simply removing any aperture, leaves a "
ghost ring" ... if ya otherwise desire that, fer a particular outing!
In this case, the trajectory's gonna be the thing! I don't like to drag a range-finder with me ... so I like PBR! ... with a 200yd zero, and ~3in at the top of the arc somewhere around 150yd, ya got a good idea, based on estimate range, whether ya might be an inch 'er two high 'er not ... and if ya really wanna, ya can try holding a skosh low ... but if ya zero on the lower-end, ya can get away with a dead-on hold out to 225yd - 250yd!
Ya can do somethin' similar with .45-70 ... but the zero's gonna be shorter ... and the top of the arc's gonna be higher! To match the new FTX .30-30, ya'd likely hafta zero at 150yd ... and at 200yd, yer already low 6in ... past that, best to leave it be! And that's a shame ... 'cause ya still got plenty of power left ... it's jest a waste, at that point! ... and that's only if ya use a 325gr FTX ... anything else, and yer gonna be a lot shorter! ... and it's gonna kick!
I wouldn't sell a 160gr .308 at 2,000fps (
and that's at 150yd) short! ... that's still gonna solve an awful lotta problems! Lotsa guys are usin' 110gr - 125gr .308 bullets at 2,200fps 'er less (
.300 BLK), to take hogs ... with ease! .308 MX is over 2,600fps at the muzzle, and still over 2,000fps at 300yd! .338 MX is the best ... but it appears they've discontinued it?!

No law (
yet) against owning more than one, neither! ... I do!

... but the .45-70 sees a LOT more bench! ... without a range-finder ... and a real nice tang peep, I wouldn't bother! And, again, if I don't need the peep, I'm in all of .44 range ... much more better gun to carry, and shoot!
For "
bullet availability", I'm not sure if you handload 'er not ... I jest loaded up on cast ... no problems, there! I suspect ya won't otherwise have a problem with jacketed! As for loaded ammo, if yer tryin' to play that "
gas-station 300mi from nowhere" game

I wouldn't hold my breath! ... but then, I usually jest bring along 60rd plus (
if fer no other reason, than if I need to prove my marksmanship to earn a couple free beers! 
)
.38-55 might also do what ya like? ... .35 Rem., fer that matter! Each of them is gonna have a better trajectory ... to an extent! Personally, I see no reason to compromise! ... get the .30-30 ... AND a .45-70 ... with both of 'em, there'd be very little ya couldn't accomplish!

If ya want a skosh more muscle, ya could go with .308 MX ... but I'd stock up on bullets (
Hornady sells a slightly different 160gr FTX bullet fer the .308 vs. the .30-30) and brass!
If ya insist on .45-70, either be prepared to let da tirty-point buck at 225yd go! ... 'er bring a range-finder! ... and know how to adjust yer sights!
