sandwarrior,
Thank you so much for that excellent answer to my question. My intentions have been to get a Tikka T3x CTR in 6.5CM. Now, since winning this Steyr SSG 69 I will at least try it to see how it shoots. Hopefully it will shoot well and I will live happily ever after.
I found some ammo Fed GM308M with the 168 Matchking BTHP; bought 40 rounds for $33.98, if I don't like it for whatever reason I'll just sell it. I'm pretty sure I can make money according to what I have been seeing on GB. If there is another factory load I should try please let me know.
I really liked the 7mm BR. It was extremely accurate and not real picky about anything I loaded for it. I wish I had never sold it even though I got out of IHMSA.
I think you'll be happy as a pig in shit! ? ? And, I really do mean that in the best way. It's historic, but relevant. With newer bullets you can reach quite a ways with it, It won't be as flat shooting, but with heavier bullets it helps with drift on the longer shots,
On the 168 gr. BTHP's,. They were probably the most specific bullet that caused so much hate on the .308. Something so simple as a slight change in boat-tail angle is what really hurt the .308's reputation. The steeper angle, combined with "usually" less twist (1-12") caused a stability disruption when reaching the transonic range (bullet reducing in speed to the speed of sound).
Contrary to popular belief/hater myth/ and other unexplained phenomena, the 168 BTHP does not fall out of the sky, it just has a larger stability disruption, The disruption is caused by the sonic boom catching up the bullet. The bullet re-settles but not on the same path. The longer it takes to settle, the wider the accuracy cone beyond disruption.
It's still spinning so gyroscopic energy is still going to re-stabilize it. FWIW,
ALL bullets are disrupted at this stage. Depending on the BC, weight and rotation of the bullet (barrel twist and velocity) some bullets will go through this farther out. Some seem untouched. as they restabilize quickly. Others may go radically unstable. The term we use for never restabilizing. Again, they don't fall out of the air, but accuracy goes all to hell past the transonic. I don't know what twist the SSG69 has, but I do know 168BTHP's are good to 800m from it in most conditions. Probably better in high density altitude. My recomendation is the 175SMK or 178 BTHP (Hornady) and Ber. 175 VLD for really long range, or even just 1k.
But, yeah, I think you'll really like this rifle.