Chucks, PD"S to me they are the same thing... Vermin I typed faster than my brain was working and thats sad [img]/ubbthreads/images/graemlins/grin.gif[/img] but I just woke up and I'm getting ready for another 12 plus hours of work.
I like the what can brown do for you comment[img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img] My guess would be splatter them [img]/ubbthreads/images/graemlins/wink.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
Guns and ammo, what more do we need?
50, i hate to say i told you so...but if a 10 is doing "pretty well" a 9 will stabilize these bullets.now, as you say,the cold, high altitude,a little more for hunting.an 8 would probably be perfect.these low twist numbers are a lot of torque.can't see using more than needed.of course a 210 or 220 might pop up if a fella was sportin a 7 twist?
I would agree with you if barrel twist rates were as consistant as the match grade bullets we are shooting out of them.
Sadly they are not.
If that Wby has an old krieger barrel on it from the factory it is cut rifled. Cut rifled barrels tend to be closer to the listed twist rate then a button rifled twist is.
As such whenever I order a Lilja barrel, I always order 1" faster twist them I think I need. While they are close, they generally are 1/2 to 3/4" off in twist. This is not just Lilja barrels but all button rifled barrels on average.
We still have not proven the 200 gr ULD is stabile in the 1-10 twist barrel but we will see soon. Testing over longer range will tell us what we need to know. I know Dick is on that task with the 1-10 twist 7mm Wby.
I myself just finished up a batch of freshly fireformed 7mm Allen Mag test loads for testing in my 1-9 Shilen barrel. Started at 94.0 gr of WC872 and stopped at 104.0 gr
I plan to set the chrono up at around 6:00 AM and see what we can get. Will probably shoot at 200 or 300 yards and see how they land on paper.
My comments about the twist is because I have personally seen what was supposed to be a 1-9 twist 6mm barrel not shoot the 105 gr A-Max bullets in a 243 AI. On the other hand I have seen a 1-10 6mm barrel shoot the 107 gr SMKs in a 6mm-06 with great accuracy for a sporter rifle.
Strange things happen in our sport.
I like your comments about a 210-215 gr ULD, originally that was the plan with This bullets prototype, may yet become a reality, especially if I can top 3300 fps with a 200 gr ULD RBBT in the 7mm Allen Mag.
Targets and testing will tell the tell!!!
I will post results tomorrow!
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
this whole topic reminds me of an experience that I had a couple years ago, the very first custom gun that I ever had built was a 6mm Ack Imp with a 1-12" twist after several seasons my shooting habits changed as I realized that a hi B.C.bullet at 3000fps is far better long range medicine than a low B.C.bullet at 4000fps, so I started tinkering with bullets with a higher B.C. and found that the Lapua 90gr Scenar shot VERY well (it is supposed to have a 10" twist to stabilize). me and goodgrouper and 7mmrhb shot one weekend and everything was fine ,the next weekend we went back to the same spot only 20degrees colder with a hint of fog and every single bullet went through the target sideways, you can cheat twist a bit in 100degrees ,but the colder it gets the cheating stops.
fiftydriver is correct in going with a faster twist to compensate for temperature and humidity and mother natures other forces.
i realize the safety factors of twist rates that should be used as compared with rates that will stabilize a bullet.after seeing the bullet next to a 160 accubond,i made the statement that i thought a 9 would stabilize it when no one else seemed to think it would.i'm not recomending using a 9 twist,but i think an "actual" 8 twist would be enough.there is already discussion on the torque factor and we're not shooting at 3200 with a 7 twist yet.