H-100V is the velocity champ in the Roberts. Not as temp stable as H-4350, just faster.
My Brux barreled, LA .257R shoots near one hole groups with the 100 TTSX over H-100V at 3,250 fps.
And, it's a killer.
What's not to like.
Check COAL, too long for SA, fine in a LA 700.
DF
Here's my .257, built by Ron Lampert, MN using a Brux barrel. It's LA, but one of the smoothest feeding bolt guns I own regardless where the round is placed in the box mag. Ron did a great job, tweaked the Walker trigger to perfection.
I fitted it in the Ti take off stock, converting ADL to BDL, glassing and free floating.
Pictured with different scopes, currently wearing the Conquest.
DF