I can't comment on the "haymaker" never having owned one but can comment on the Bushmaster cartridge having built one earlier this year on an Axis action. The Bushmaster is a real 'thumper" of a cartridge and will do the job out to 200 yards with the right bullets. I have hand loaded 400 grain JSP 45-70 bullets that I resized to .452" and was able to push them to 1600 fps from my 16" barrel with 16" twist.
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