Berger Hybrid Expansion Test @ 1180 yds

[Broz]

Originally Posted by mmmooretx

Just curious on the 300 win and the 210 Bergers, how far off the lands is the sweet spot for your gun?
Thanks.

That rifle has a Broughton 5C and we are .005 Off the lamds.

Jeff

[mmmooretx]

Originally Posted by Broz

That rifle has a Broughton 5C and we are .005 Off the lamds.

Jeff

Thanks a lot. I am doing load development for the Berger 210 and was getting 1.2" groups at 100 yards with 78.5 gr of H1000 at .008 off the lands (Kreiger 24"). With the SGK 200's I was getting .38" 5 shot groups at 100 yards, .010" off the lands. I ran across a thread at Berger that Berger recommends .030-.040" off the lands. I am waiting for the rain to clear so I can do a ladder test at 200 yards with 3 shots each at .030, .035, & .040" to see if that tightens up the group. Hurricanes are such an inconvenience!
Thanks again for your inputs.

[Broz]

mmmooretx,

I am one of those guys that does not believe in wasting bullets at 100 yards. I have personally seen loads that shot 1" at 100 and still 1" at 300. Some might have scrapped that load looking for the illusive same hole group at 100.

Is your Krieger a 4 land barrel? I am removing one of these that I was not happy with shooting 210's. Not saying it was Kreiger fault, could have been other things too. But a Broughton 5C is going back on.

78 gr of H-1000 is a pretty stout load especially close to the lands. Most of the 300s I have loaded 210 Bergers in were happy between 74 and 77gr of H-1000.

Hope this helps ya a little, good luck!

Jeff

[mmmooretx]

Broz, I looked down the barrel and decided I could not count that way, so I took a 210 Berger dropped it in then tapped some with my Tipton cleaning rod. I then tapped it out with the Tipton cleaning rod and counted the marks on the leading edge of the ogive. I got 8 land marks, does that sound right?
On the powder charge I have no over pressure signs and I am at about 2900 fps. at 15' with my CED M2.

[elkaholic]

I've found that a folded up piece of berber carpet will really capture things at the end of the box. especially when they have expanded and have some jagged edges. "kind of like a bullet proof vest" Good post Jeff........Rich

[Chas1]

mmmooretx, were the 8 land marks equally spaced or did you have 4 pairs of marks equally spaced?

[Broz]

Originally Posted by mmmooretx

Broz, I looked down the barrel and decided I could not count that way, so I took a 210 Berger dropped it in then tapped some with my Tipton cleaning rod. I then tapped it out with the Tipton cleaning rod and counted the marks on the leading edge of the ogive. I got 8 land marks, does that sound right?
On the powder charge I have no over pressure signs and I am at about 2900 fps. at 15' with my CED M2.

You must be getting a mark from each side of the lands. I am betting it is a 4 land barrel. Your velocity sounds pretty close for a 24" barrel and 78.5 gr of H-1000. I feel you are close to or a bit over max though. So you may want to keep that in mind for hot weather shooting or further development.

Jeff