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Post by elkman1310 on Feb 7, 2020 18:26:28 GMT -5
Well I dug out my 7mm Weatherby barrel again and put it back on to test a idea I had and to see if I wanted to invest in a new barrel. I my previous tests I used Berger 180gr VLD bullets and RL23 that didn't prove to be the right combination.
Since Berger just released a new 190gr Hybrid the bug bit me again to see how they would work. In the mean time I had some 195gr EOL bullets which I used in my 7 STW 1-8 twist barrel. This barrel I have chambered for the Weatherby is a 1-9 not ideal for these long bullets but it would give me a good idea of how much H1000 I could needed to reach my target velocity of 2950 fps. I knew I could probably get more velocity than that but for benchrest accuracy I wanted to stay below 3,000 fps. 70.5grs of H1000 really shot small groups at 100 yards it was my best load with also a very low deviation which is really import. I tested all the way up to 74grs that produce 3085fps but also showed a slight ejector mark on the case and also a slight click at the top of the bolt opening not where I want to be with this brass.
I just received a box of the new 190gr Hybrids today along with a box of the 30 caliber 208gr Hybrids both of these new bullets are pointed from Berger the tip is not closed up completely but they really improved the AOL measurements compared to their non pointed or tipped bullets the 208grs should work really well in my 300WSM.
If I go with a new barrel for the 7mm it will have a 1-8.5 twist that's what Berger recommends the 1-9 shot well at 100 but I doubt if it would do well at 1,000 yards. and because of the slower twist it reduces the BC of the bullet slightly. |
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Post by bkm on Feb 7, 2020 22:26:22 GMT -5
Curious how many rounds u get out of the 7 Weatherby tubes?
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Post by elkman1310 on Feb 8, 2020 9:23:44 GMT -5
That's a good question. I bought this barrel in 1976 it was chambered for 7/300 Weatherby and I shot it in 1,000 yard competition for several years and used it for long range hunting for ground hogs to deer. I have lost count on how many rounds I actually shot through this barrel I am its well over 1,000 it was always very accurate.
This barrel is a old Hart S/S button rifle barrel it started out at 30 inches. I do believe the barrel steel was much better than what we have today. Many of the barrels I have checked in recent years all develop small pin holes in the bore it doesn't seem to hurt the barrel but you never saw that in the barrels made before the year 2000.
I cut 3 inches off the barrel to rechamber it to a straight 7mm Weatherby the shorter case burns less powder but still comes close to the 7/300 even with a 27 inch barrel. you can only burn so much powder in any given caliber. For true 1,000 yard match accuracy where we rapid fire 10 shots I would guest it will be toast by 800 to 1,000 rounds. The thing that helps this case is the long neck and the fact that H1000 doesn't burn the throat out like a faster powder would. for hunting purposes you should be able to get 1,000 rounds without much problem. the 7mm WSM will burn out around 6&7 hundred.
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Post by bkm on Feb 8, 2020 22:03:50 GMT -5
Thanks. That’s good information. I too have a love for big 7’s. I currently have a Kreiger chambered in 7MM RUM. Only have 600 rds on it and it is fire cracked really bad. I’ve been pretty easy on it. Not much rapid firing. Nothing but H-1000 and 180 hybrids. It has been fun for those 600 rds though.
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Post by elkman1310 on Feb 10, 2020 20:44:44 GMT -5
Yes the 7mm RUM would burn a lot more powder and harder on the throat then the 7mm Weatherby. Unless your running a 30 plus inch barrel your really not getting nearly all the velocity out of the RUM.
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Post by bkm on Feb 10, 2020 23:22:29 GMT -5
It’s 28”.
Can’t run it over 3200 with the 180’s.
Primer pockets won’t take it
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Post by elkman1310 on Feb 11, 2020 8:42:08 GMT -5
28 is really to short for a 7 RUM. I have a 36 inch barrel on my long range 7mm STW there is night and day difference between that and a 30 inch tube. I can run 195gr EOL bullets out at 3300 fps. That's faster than what Berger recommends. My 7/300 Weatherby with a 30 inch barrel ran 180gr VLD's at 3285fps with no problems using RL25.
What brass are you using Rem. brass won't take a lot of pressure because they have it way undersize at the belt. by the time it expands on the first firing it's loose I have been running Norma brass and it's better. Every gun and barrel is different so you can only shoot what the gun will handle no magic to it.
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Post by bkm on Feb 11, 2020 18:14:18 GMT -5
I use Nosler brass. Barrel is RemVarmint contour.
I built it to carry so went with 28” plus the brake.
It’s still not the easiest thing to carry but it’s doable.
I shot a couple steel matches with it. It’s really fun to shoot but 5 shot strings are definitely hard on it.
It’s hard to have ur cake and eat it too i guess.
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Post by bkm on Feb 11, 2020 18:26:02 GMT -5
What other calibers do u mess with Elkman?
What’s ur favorite?
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Post by elkman1310 on Feb 18, 2020 10:31:08 GMT -5
Well I got a box of the new 190gr Hybrid bullets to test in this same barrel that shot the 195EOL bullet really well at 100 yrds. Make a long story short the 190gr Hybrid shot all over the paper. Not to surprising the 195gr EOl is a little longer but it has more bearing surface than the 190gr which probably cause the accuracy problems.
So if I would want to use them you would need a 8.5 twist or probably a 8 twist would be the best choice.
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Post by elkman1310 on Feb 18, 2020 10:40:48 GMT -5
I spend a lot of time with my 6mm Dashers for 1,000 yrd competition. Also 300 WSM for competition. I just tested my 300 WSM yesterday with the new Berger 208gr Hybrid shot through my Mullerworks 5r barrel 1-10 twist and at 365 yards they shot two 5 shot groups 5/8 of a inch. That was from our crappy benches at my local range can't wait to test them at 1k.
I also shoot a couple 6.5/284's which I like a lot. Both my 6.5/284's are getting tired they still shoot plenty good for varmint hunting but not for competition. Surprisingly the 6mm Dasher is my first choice for shooting tiny groups at any distance. You have to rapid fire it in windy conditions but it still seems to always group better than the 300 WSM. The WSM might score better but the Dasher will usually produce smaller groups.
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Post by bkm on Feb 18, 2020 16:34:53 GMT -5
The 208’s sound like they going to work for u.
That’s pretty stout. If u get a chance try some berger 200 20x’s.
I don’t shoot BR. But have a couple friends that do.
They mostly shoot 6 bra’s but one of them shoots a 300 wsm.
I convinced him to try the 20x’s.
He’s shot some really small groups with them.
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Post by elkman1310 on Feb 18, 2020 18:01:03 GMT -5
Just about all the bullets Berger makes shoot really well once you learn want they want. I don't know of anyone on our range using that 200gr bullet. 210 VLD and up. The 208Hyrbrid replaces the 210 LRBT with a better BC and the point is closed up that's a step I don't have to do also these new bullets are the first run from new dies they check out really well I bought 500 more of the same lot so I am good to go for the whole season.
My buddy will be testing the new 6.5 144gr Hybrid in the 6.5/284 I sold him last year it shoots the 142gr SMK really well but you always need to test to see if you can shoot smaller groups at 1K. Relays wins can come down to only a few thousands of a inch.
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