I built a 6.5 x 55 BJAI on a Mauser 98 a few years back. Machined the blank to just leave an 8th inch of wood on the forend of the Fajen Stock its inand bedded it on pillars and epoxy.
It is exceedingly accurate, on one lucky day I put four ( Last four of a test batch that had done very well at 100) Hornady A-max 140's into .69 at 300.
Haven't repeated THAT group, but the accuracy is there.
I used Bob Jourdans loads as a staring point, and have ended up sticking mostly to the H4831 SC.
I plateaued around 2900 with the 140's nothing seemed to get it past that with the 4831, more powder brought pressure signs with diminishing returns on speed.
With 120's I could get past 3100.
Bob Jourdan Loads printed in Precision Rifle Magazine
M98 Custom Mauser, 27" Barrel (see notes)
Sako AV, 24" Barrel (see notes)
by Bob jourdan, 1997 update
120 gr.
IMR4895 45.0 3,111 47.0 3,214 27" Near Max.
IMR4064 44.0 3,034
AA2700..48.0 3,042 51.0 3,225
AA4350..49.0 3,085 51.0 3,195 Max.
H414....51.0 3,143 54.0 3,326 Max most accurate
H4831...54.0 3,090 57.0 3,246 Compressed
IMR 7828 55.0 3,153
Bob Jourdan loads
129 gr.
4064 41.0 2,791.....42.0 2,838 27" barrel.
4350 47.0 2,874.....48.0 2,963
H414 47.0 2,903.....51.0 3,080
H4831 49.0 2,929....53.0 2,986
7828 54.0 3,075
140 gr.
4350 47.0 2,808.....48.0 2,883 27" barrel
H414 48.0 2,861.....50.0 2,968
H4831 48.0 2,803....53.0 2,922
7828 51.0 2,872
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