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Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by Charles A, Nov 9, 2003.
Finely got the tomahawk and need some loads. Specifily with retumbo and 220gr matchkings, thanks.
This will give you a start, any 300 Ultra Mag data should for that matter. Good luck with it.
Tried 103gr of retumbo, slight extracter marks on the cases, though they shot pretty well.. Trying 102gr tomorow.
You're going backwards.
With the longer bearing surface of the SMK, I bet pressure is pretty high at 102 as well.
I tested 87-93gr using the 220 SMK and Retumbo in my 300 Ultra, and ejector mark was present at 88 (2900 fps 26" tube), and at 92 and 93 was simply excessive. Pressure from the M43 indicated 64 & 68Kpsi at 92 (3000 fps) & 93gr (3025 fps).
I shot some groups at 88gr and groups weren't too good. Never tested the load again. RL25 worked very well and didn't show the pressure Retumbo did.
In the 30/338 Lapua Imp, I'm using about 95-96gr and 3200 FPS with the 210gr Berger or JLK in the 30" tube, after that it's too much with them seated on the lands. This is borderline anyway. About 1.5gr more powder if I seat them off the lands .100" gives the same pressure and MV though.
Only two cases had extracter marks. Though I feel a little wierd shooting it at 100yds, kind of like shooting a heavy barreled 220swift at 25.
Trying 101gr Thursday.
Maybe I'll back it off to 95gr.