Barrel query

[Canadian bushman]

I along with couple of shooters on Irish team shot few hundred 215h over couple of days at last creedmore shoot in Ireland along with another match sure knew we shot them, They are very sensitive to grip and cheek weld and consistency is the name of the game with the 215h if verticals to be kept to minimum however they are a mighty bullet in v rough conditions.

I dont shoot that many matches, consequently ive just not gotten good enough to manage an entire string. That or i simple dont have what it takes. The gun is fantastic i just start tossing them up and down mid string.

 

[kyreloader]

I found H4895 and varget accurate however to hard on brass with 200g to 215g Hybrids, H4350 will get lower node 2,620 fps with compressed charges, would be great if hodgdons would produce a stick powder in their extreme range between Varget and H4350 burn rate which would be ideally suited for 215g hybrid in .308.

IMR 4451 might just be perfect. Seems to have burn rate right where are you looking for it to be.

Thanks for info Kyreloader, will have to try out IMR 4451, is it temp stable like hodgdon extreme line of powders.

It is supposed to be and was tested on the daily bulletin and found to be by that tester in a .284 Win if I remember correctly.

 

[paulT]

IMR do produce great powder used IMR 4064 for my swift for years.

 

[boltman223]

it's just that I have been told that some have tried 1/8.5 twist and shorter barrel length with good results but I cannot get anyone to verify it.by the way I'm using a 32 inch barrel., maybe shorter would be better
[/quote]

We've tried barrels from 26" to 30"; 1:9" and 1:10" for the 215's. All work; it does seem like the shorter barrels are less sensitive meaning they provide better groups across various different set up's, rear bags, etc. With the longer barrels you better not alter 1 ounce of pressure on the rifle anywhere for any shot or you'll be looking at a flier.

Initially we ran 1:9" twists to optimize BC with the low velocities we were getting from the shorter barrels. The team is now a mix of barrel lengths and twists as we're moving away from standardizing around the 215's and trying other bullets; 185's and 200's. Our win at Camp Butner was a testiment to the virtue of mostly X-ring vertical with the mid weight bullets, even if it comes with more overall wind deflection.

-Bryan

Here's a little bit about barrel length mentioned by bryan litz.