Greg,
I’ll jump in here with some comments. I understand the current Winchester BPCR Creedmoor model that does come with sights has the correct sight dimensions for handling any range out to 1000 yds. as does the original Browning Creedmoor. Although some folks prefer sights from suppliers other than AMT (the Browning and Winchester sight manufacturer), Browning/Winchester did their homework on the correct size (height) of sights. The soule tang sight ladder has an adjustable range of 0 to 2.5” with the lowest setting placing the aperture hole approximately 2” above the rear tang. The 2.5" of adjustment results in approximately 250 minutes of angle (MOA). The center of the front spirit level sight is approximately 0.7” above the bottom of the dovetail. You might consider using these dimensions as guidelines. The Winchester does have a standard 3/8” dovetail for the front sight. And be sure to request the tang sights with the correct base hole spacing to fit a Browning or Winchester.
When purchasing a front sight, you will have an option of a fixed or windage adjustable sight. Although most soule-type rear sights are adjustable for windage, shooting out to 1000 yds may require the addition of a windage adjustable front sight.
By the way, I concur with the suggestion that you also purchase a Hadley-type selectable aperture rear sight cup, which allows for easy aperture hole size selection based on prevailing light conditions. Just make sure you get one with screw threads to match the rear sight.
To check out the sights that came on all the Browning’s and some of the current Winchester Creedmoor’s, click on following link.
(You need to Login or Register to view media files and links) In case you are interested I do have a brand new AMT full windage set available. You’ll note that AMT currently gets $560. I’m asking $450. It comes in a plastic storage box, has the three eyecups and a sight card with 8 inserts. By the way, the rear sight staff is tight with no fore or aft movement, which is one of the complaints Browning rifle owners had. The rear sight has the correct hole spacing for a Browning or Winchester. If you do purchase a 30” barrel rifle from me and the sight set, I’ll even mount the front sight for you. The tang sight is very easy to mount and remove with the two screws that come with the sight. I should also mention that the top of the rear tang sight base has "BROWNING" stamped on it
Wayne