Rechambered the Mashburn with a reamer designed for the 195 Berger and magazine restrictions. Tried H-1000 like the last load but hit pressure 2 grains before old load which I expected because of the lack of throat. Plenty of room in the case for powder still, so RL-33 was a choice.

Ran it from 70 grains to 74.5 with the bullet on the lands. Got ejector marks
At 73.5 and 74.5 but 74 was good. ?

Shot an incredible Audette at 560 with the node measuring about 2 1/2". It
Liked the powder and bullet.




Shot groups with the loads in the node. 71.5 and 72 shot great with no vertical at 560






Stayed with 72. Groups at 100 were not impressive but incredible at longer range

I've frequently found that to be the case with the 195 in my rifles. Sub MOA at 100, but many sub-half minute groups out beyond 300-400.

Nice shooting!

Nice Rick. Now I understand the RL33 issue!

Interesting that the shorter throat on the new reamer cut the charge two grains. Looks like the old reamer has a long throat....

Why you guys suppose the groups were relatively better at distance with the 195? There are people who don't think that can't happen.....

Nice!

Wonderful thing when your ladder is so tight that your not sure which node you want to try.
I like it.

dave

I'm guessing it's because the 7mm 195gr bullet is so long for caliber that it requires a lot of rpm's to stabilize, and it takes a while for torque-induced nutation/precession to be ironed out from its gyroscopic motion. This often takes place closer than 100 yards, but in this case it might be just beyond. Bryan Litz discusses this concept in greater detail in his book Modern Advancements in Long Range Shooting.

Rick, what twist is your barrel?

The 195 is a fun bullet for sure! I've only played with it from my 7 WSM....

Any terminal reports coming in on it this fall yet?

Probably Right..





9

A 1-9" for a 195 gr Berger,interesting. Figured it would have a little faster twist than that.

It's a pretty well known phenomenon in long range shooting with VLDs. Simply put they need some distance to "go to sleep". I think Litz gets into it in his book.

I tried tuning a load that was in the node showing no vertical with seating depth to shoot well at 100. 4 went into 1 hole. I shot it at that depth out to 800 and it suddenly had 1 MOA of vertical

I'm gonna check groups at the original depth (on the lands) of development at every range and see where it "goes to sleep"

Maybe I missed it but what velocity are you getting

Parallax error. Bullets don't go to sleep if they start fcked up it's not going to get better.

2925





It's certainly not Parallax!

In regards to the "going to sleep" theory, maybe Bryan Litz has come up with some new research since 2014, but here is what he came up with then:
Bryan Litz Applied Ballistics 'Shoot Thru Target' Challenge