.300 Dakota
Well-Known Member
I have found them to be a mixed bag. My favorite of the bunch is the 240 Wby, followed by the .340 Wby. I am also a fan of the new 6.5x300. It seems slightly more consistently accurate than the .257 Wby BUT you need AT LEAST a 28" fairly heavy barrel to get it where it shines. My least favorite is the .338-.378, which I couldn't get to group inside 2 1/4". Sent it to Wby and they sent it back some months later with a test target showing a 5/8" group. I took it back out with the same ammo (tried 3 different bullts/weights in Wby brand) and got the same 2 1/4 - 3 1/2" as before. Interestingly, I left it with a Wby certified gunsmith first, and he couldn't get it to group as well as I did, so he sent it back to the factory. Not sure if they shot it out of a special vise or shot a 40yd target like Cooper, but they didn't shoot a 100yd target with factory ammo off a bench from bags. I had some issues with improper torque (or so they said) from some of the Mark Vs (circa late 90s/early 2000s).
Vanguards are all ok. About MOA. Occasionally you find one that is stellar, but maybe only around 1 in 10. My issue with both Mark Vs and Vanguards regarding the .240 is that most all of them have a 24" barrel (too short for the slow powder necessary to propel bullets out of that round, as it's close to overbore for the bore size, and they all have a 1:10 twist. With the long case neck perfect for 105 - 115gr bullets, it will not stabilize them. It did excellent with 100 grain flat base Sierra ProHunters, but that's about as long of a bullet as it will handle.
I am going to have a custom built with 26" #4 barrel and 1:7.5 twist (at least 1:8). I just had a 6mm Remington finished at 26" #4 with 1:8, but the lead is too short for 95gr Barnes LRX on up to be seated far enough out to keep them from taking up half the powder capacity of the case body.
You heard it here first, but if someone were to neck the 6mm Remington case up to 6.5 and make the throat to where 140gr bullets would seat at the neck/shoulder junction, with the 65,000 psi maximum average chamber pressure and 57gr case capacity, it would be known as the Creedmoor killer at matches...
Vanguards are all ok. About MOA. Occasionally you find one that is stellar, but maybe only around 1 in 10. My issue with both Mark Vs and Vanguards regarding the .240 is that most all of them have a 24" barrel (too short for the slow powder necessary to propel bullets out of that round, as it's close to overbore for the bore size, and they all have a 1:10 twist. With the long case neck perfect for 105 - 115gr bullets, it will not stabilize them. It did excellent with 100 grain flat base Sierra ProHunters, but that's about as long of a bullet as it will handle.
I am going to have a custom built with 26" #4 barrel and 1:7.5 twist (at least 1:8). I just had a 6mm Remington finished at 26" #4 with 1:8, but the lead is too short for 95gr Barnes LRX on up to be seated far enough out to keep them from taking up half the powder capacity of the case body.
You heard it here first, but if someone were to neck the 6mm Remington case up to 6.5 and make the throat to where 140gr bullets would seat at the neck/shoulder junction, with the 65,000 psi maximum average chamber pressure and 57gr case capacity, it would be known as the Creedmoor killer at matches...
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