I had a different experience with the boat tail bullets, so don’t start using those .250 1-14 TJ’s for pry bars just yet.
I have only been able to shoot at 10 yards with my TJ 1-14 250 barrel, so take this for what it is worth.
In my Troy Hammer ported and restrung Kral Bighorn, NSA 43.5 grain flat base hp’s shoot into a tight one hole group tuned down from 1050 fps to 900 fps.
I also tried the Gtiffin 68 grain and 60 grain both BTHP. With the boattail, I hoped to get a longer projectile without the long bearing surface that the Altaros 67 grain bullets had, thus gaining more velocity to stabilize the longer/heavier bullets. The 68 grain bullets would group tightly until 3 or so shots were fired, then as velocity decreased, from 825 fps to high the 790’s, key holing entered the picture. The 60 grain Griffins at 905 fps shoot the same as thev NSA43.5 grain bullets.
But again this was at 10 yards, but at that range the NSA and Griffin 60 grai bullets shot as well or better than my 3 .22’s that are for 10 yard shooting ever have, and those 3 rifles shoot little bug hole groups. I hope to get out to my sons range this month and stretch the Bighorn out further.
The top group was fired with my newly installed 1” od x .75 “ barrel shroud coming loose, the results were better after retightening it as seen in the two lower groups.
Regards,
Roachcreek