|
Joined: Dec 2006
Posts: 148
Campfire Member
|
OP
Campfire Member
Joined: Dec 2006
Posts: 148 |
My brother is working on a 7mm STW AI load. He is using H1000, fire forming has gone well, no growth of brass measured with mic, no visible pressure signs.
We do not have access to one of those fancy Oehler's so we can not measure the pressure. However we do have an old Oehler 33, so we can monitor the FPS.
In spite of my ragging on my brother he is determined to use the 140gr Nosler BT. We are wondering if 3400 is to fast?
Thanks, Don
-----
Chopaka Snohomish Co, WA NRA Life Member
|
|
|
|
Joined: Mar 2001
Posts: 12,159
Campfire Outfitter
|
Campfire Outfitter
Joined: Mar 2001
Posts: 12,159 |
I wouldn't run one that fast. I had a couple of blowups out of a 7mm rem mag at 3200 fps. When I had a 7mm STW I used 140 grain partitions at 3500 fps. Nowadays I'd probably choose the accubond. H1000 is a little too fast burning powder for my taste in the STW, I had better luck with RL25.
|
|
|
|
Joined: Dec 2005
Posts: 12,630
Campfire Outfitter
|
Campfire Outfitter
Joined: Dec 2005
Posts: 12,630 |
It's not overly fast.Myself with the lighter weight bullets up to 150 grains I use IMR 7828.
|
|
|
|
Joined: Sep 2003
Posts: 4,533
Campfire Tracker
|
Campfire Tracker
Joined: Sep 2003
Posts: 4,533 |
3400 is a good place for that bullet weight.
+1 for 7828.
Proud Member of the AccuBond Society.......
|
|
|
|
Joined: Feb 2005
Posts: 9,472
Campfire Outfitter
|
Campfire Outfitter
Joined: Feb 2005
Posts: 9,472 |
I have some A-Square factory loads for a STW that shoot a 140 Nosler BT at 3500.
|
|
|
|
Joined: Oct 2005
Posts: 544
Campfire Regular
|
Campfire Regular
Joined: Oct 2005
Posts: 544 |
My brother is working on a 7mm STW AI load. He is using H1000, fire forming has gone well, no growth of brass measured with mic, no visible pressure signs.
We do not have access to one of those fancy Oehler's so we can not measure the pressure. However we do have an old Oehler 33, so we can monitor the FPS.
In spite of my ragging on my brother he is determined to use the 140gr Nosler BT. We are wondering if 3400 is to fast?
Thanks, Don Hello Don. Tell your brother, IMHO, he is treading on thin ice. The standard STW can be loaded with powder levels greatly exceeding the pressure limits for all manufactures. Unless you have had the action heat treated and pressure tested it could be dangerous. I would consult with a very experienced Smith on this one. You can already achieve 3300+ velocities with a 140gr bullet in the standard STW. I'm no expert, however, I just don't get it. Very interested in the project, but nonetheless, I'm curious. Having said that, I wish you guys good luck. The STW is a finicky critter that takes alot of patience. Regards, Rick.
John Deere tractors and Sako rifles.....doesn't get any better.
|
|
|
|
Joined: Aug 2003
Posts: 573
Campfire Regular
|
Campfire Regular
Joined: Aug 2003
Posts: 573 |
I can get there in a standard STW/27in bbl, with H1000 or Rl22, or 7828. 3300 is plenty.
|
|
|
|
Joined: Apr 2003
Posts: 761
Campfire Regular
|
Campfire Regular
Joined: Apr 2003
Posts: 761 |
I have had a couple of 140g BTs blow up at that speed from a STW at the range...8-10" holes in the plywood backing.
|
|
|
|
Joined: Mar 2006
Posts: 6
New Member
|
New Member
Joined: Mar 2006
Posts: 6 |
My 7STW was running 3380 with 150 gr BTs over 79.3gr IMR-7828. I think your OK.. but need heavier bullets to really see the STW shine..
Blygy
|
|
|
|
Joined: Feb 2005
Posts: 9,472
Campfire Outfitter
|
Campfire Outfitter
Joined: Feb 2005
Posts: 9,472 |
FWIW most max loads in Nosler#5 are in the neighborhood of 3350 with a max load of AA8700 reaching just over 3400. However Nosler doesnt show data for Hodgdon H-1000, Retumbo, or RL-25 which should all work well in this gun. I would expect a max velocty for a 140gr Nosler to be in the neighborhood of 3450 with the right powder in your STWAI. I would start with AA8700. It works great in my 7MM ultra.
|
|
|
|
Joined: Dec 2006
Posts: 148
Campfire Member
|
OP
Campfire Member
Joined: Dec 2006
Posts: 148 |
Personally, I would rather see him using the Hornady 162 gr SPBT instead of that 140gr bomb. I predict the first buck he shoots at close range will have an entry wound that will look like an RPG attack.
Last edited by Chopaka81; 01/07/07.
-----
Chopaka Snohomish Co, WA NRA Life Member
|
|
|
|
Joined: Mar 2005
Posts: 5,233
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2005
Posts: 5,233 |
i ran an 140 NP into exactly one buck at 80 yds, mv was 3440 IIRC and like i said it was only one. the rpg attack was out the offside however the deer died right now. after that i ran the 140 np to the same MV with great results. when pushed that fast the NBT just does not stay together IMHO
|
|
|
|
Joined: Aug 2003
Posts: 573
Campfire Regular
|
Campfire Regular
Joined: Aug 2003
Posts: 573 |
The 162 Hornady has proven to be way softer than even the 120 Ballistic tip for me. Haven't tried the Interbond. The Hornady shot great tho.
|
|
|
|
Joined: Dec 2005
Posts: 12,630
Campfire Outfitter
|
Campfire Outfitter
Joined: Dec 2005
Posts: 12,630 |
Stay as far a you can from the 154 IB STW loading.What a pain in the azz that bullet is.I finally found a half azz hunting load but accuracy is no screaming hell and performance on large critters was dismal at best.
Complete waste of good powder.
|
|
|
|
Joined: Jan 2004
Posts: 10,323 Likes: 4
Campfire Outfitter
|
Campfire Outfitter
Joined: Jan 2004
Posts: 10,323 Likes: 4 |
A friend of a friend claims to have 140gr triple shocks motoring just shy of 3700fps, I have no reason to doubt that info.
I have my STW pushing 160gr partitions right at 3200fps. Could push a little more but I'm plenty happy with what I've got now.
Done the RPG thing and never will again. Stuck one 150gr BT into the brisket of a midsized whitetail and could have filled the entry wound with a grapefruit.
Black Cows Matter!
|
|
|
|
Joined: May 2002
Posts: 519
Campfire Regular
|
Campfire Regular
Joined: May 2002
Posts: 519 |
alot depends on your barrel, custom barrels are normaly faster at the same pressures. My lilja barreled bansner puts the 140 NB out at 3552 fps, thats with 86gr. of H1000 with absolutely no signs of pressure. the 160 accubonds run 3340 with 94 gr of WC872, again (in cool weather,872 is temp sensative in smaller cases than its designed for) with no pressure signs whatsoever RR
If your going through hell, keep on going, don't look back, If your scared don't show it. You might get out b'fore the devil even knows your there. (Rodney Atkins)
|
|
|
|
Joined: Dec 2005
Posts: 12,630
Campfire Outfitter
|
Campfire Outfitter
Joined: Dec 2005
Posts: 12,630 |
I have found you need a really good barrel to get a good STW.Never have been impressed with that cartridge unless it was custom tubed.fwiw....What I mean is they can be picky to load for.
|
|
|
|
Joined: Dec 2006
Posts: 148
Campfire Member
|
OP
Campfire Member
Joined: Dec 2006
Posts: 148 |
My lilja barreled bansner puts the 140 NB out at 3552 fps, thats with 86gr. of H1000 with absolutely no signs of pressure. RR Actually he arrived at the same/identical load. Same muzzle velocity.
-----
Chopaka Snohomish Co, WA NRA Life Member
|
|
|
|
Joined: May 2002
Posts: 519
Campfire Regular
|
Campfire Regular
Joined: May 2002
Posts: 519 |
here are some of Layne Simpsons loads published in the april 1995 edition of handloader.
140gr Sierra SBT, H4831, 78gr-81gr, 3348-3417fps (decently reasonable) 140gr Nosler BT, RL22, 78-80gr, 3404-3463fps (about right with current data) 140gr Nosler BT, H1000, 86-88gr, 3373-3516fps (getting hot in here) 140gr Nosler Partition, 7828, 80-83gr, 3407-3498fps (even hotter) 160gr Speer GS, RL22, 76-77gr, 3165-3219fps 160gr Speer GS, H1000, 80-85gr, 3149-3319fps (smokin) 160gr Partition, H5010, 87-90gr, 3182-3311fps, (wow)
A-Square factory loads in 26.5" Custom 700, Schnieder barrel, wow, look at these speeds. 140gr Nosler BT, 3512fps 160gr Partition, 3315fps 160gr Sierra SBT, 3303 RR
If your going through hell, keep on going, don't look back, If your scared don't show it. You might get out b'fore the devil even knows your there. (Rodney Atkins)
|
|
|
|
Joined: Dec 2005
Posts: 12,630
Campfire Outfitter
|
Campfire Outfitter
Joined: Dec 2005
Posts: 12,630 |
Thanks for posting that Ridge Runner.
|
|
|
|
606 members (1beaver_shooter, 160user, 1badf350, 1936M71, 1lessdog, 68 invisible),
2,774
guests, and
1,306
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
Forums81
Topics1,193,192
Posts18,503,481
Members73,993
|
Most Online11,491 Jul 7th, 2023
|
|
|
|