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> Designed Operating fps Range of 270 and 7mm SST's
Designed Operating fps Range of 270 and 7mm SST's
@ 11:40 pm (GMT) |
deerndingoHi All,I had reason to ask what the designed operating fps range was for 130grn 270 and 162grn 7mm SSt's. I got the following answer. The 130 grain SST, 270 bullet has a designed Terminal Impact Velocity Envelope from 2800 fps to a max. velocity of 3400 fps, for optimum performance. The 162 grain SST, 7MM bullet, will have a parameter of 2300 to 3300 fps. Both bullets will still perform well below these velocities but this is the optimum designed velocity range. With a lower "recommended" fps of 2300, the 162grn 7mm pill with an MV of 3030fps would be technically limited to about 425yards. The idea of annealing the ogive to control limit of expansion seems a valid thing to do. I'd be interested to hear comments. and by the way, I think the SST is an absolute stopper. It has been on all the animals that I've shot. None made more than 20 paces and that was a rare one. Thanks[b] |
Replies
@ 03:14 am (GMT) |
Nathan FosterRe: Designed Operating fps Range of 270 and 7mm SST'sHi Deerndingo. I have put my comments in the KB and books based on my own field experiences.As far as the 130gr .270 bullet goes, I do not like the short length of penetration in close at high velocities. There have been several instances where penetration has been only 6". Certainly enough to destroy vitals but not ideal if a tough animal is encountered. I have not used this bullet on shielded boar as I do not want to take the risk. Hornady make many good bullets and as suggested in the response you received, the bullets work well below the "cover my ass" suggested operating range you were given. But there are limitations and considerations with the various designs. The 130gr would be quite good on Roo and wild dogs. But then so is the V-Max. |
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@ 03:45 am (GMT) |
deerndingoRe: Designed Operating fps Range of 270 and 7mm SST'sHi Nathan,Hope all is well with you and family. I've shot about 25 red and fallow deer with the 130grn 270. I use it in an old 270-308 (Simplex reloading dies). It has an MV of 2850fps with 42.5gr of 2208. Shot placement has been pretty spot on by luck. They have all fallen within 20 paces and many on the spot to this round. They were shot at between 20m to 200m. The closer shots have had dramatic terminal ballistic results. In all cases the lead had separated from the copper. A few of these close shots were head on to the centre of the neck travelling into the lower spine at the base of the neck. The spine was shattered and there was much tissue damage prior to that. Other longer shots have been shoulder/lung shots. After reading some of your writings I think they have disrupted the thoracic ganglion as many of these longer shots resulted in them being a display rug before they hit the ground. And they had soup for lungs. As disconcerting as it has been to not get lead back with the copper casing, I take comfort from the thought that the SST has been so devastating on game from young fallow to 5x5 red deer. They have been going of like a grenade inside these animals. Just some feed back from what i have found. |
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@ 08:54 pm (GMT) |
Nathan FosterRe: Designed Operating fps Range of 270 and 7mm SST'sThanks Deerndingo, all well here.Yes, that sounds the same as our results at mild impact velocities. |
@ 05:32 am (GMT) |
Mike DavisRe: Designed Operating fps Range of 270 and 7mm SST's.270-308 thats my kind of 7mm08 LMAO no Jaffaland latte drinking shite to be poked at a fella. always thought that would be a good way to go, and then they brought out the 6.8 spc and spc11 which seem to be ok from reports. the new barnes type projectiles made for them may be great for you???? |
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@ 11:05 am (GMT) |
deerndingoRe: Designed Operating fps Range of 270 and 7mm SST's6.8 is a little underpowered for me. Given the huge range of rounds brought out in recent years I don't understand why they haven't brought out a 270-308. Its not as if half the rounds out there don't effectively duplicate the other half. The 270-308 seems a logical, missing power step. Anyway, it slays what I shoot at close to moderate range. |
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@ 06:59 am (GMT) |
Mike DavisRe: Designed Operating fps Range of 270 and 7mm SST'ssounds great. I was meaning the lighter barnes projectiles may be worth a look...plurry expensive but. |
@ 11:53 pm (GMT) |
Shawn BevinsRe: Designed Operating fps Range of 270 and 7mm SST'sI'm a big fan of the 270. For the whitetails and even the black bear in the northeastern US it is potent medicine. Most people I know use the 130 gr bullet. I would bet that well over half use the Remington 130 gr coreloks. For my type of hunting (out to 300yds), the coreloks do their job. Since I handload and began reading Nathans data base, I've gone with heavier 150 sst. I normally shoot right behind the shoulder and get drop on the spot kills. If they don't drop, they move maybe 50 feet and expire. No trailing needed. Whitetails here can go into the 250lb live weight mark but most are 140-160 live weight. [/b] |
@ 12:40 am (GMT) |
Thomas PavelkaRe: Designed Operating fps Range of 270 and 7mm SST'sHey ShawWe just might be neighbors. 250 Pound Whitetails would put you in Maine? We got some bruisers here in NH but 250 class is pushing it. I too have used the lowly Corelokts as well as factory Winchesters. Both have blown some holes through animals that have to be seen to be believed. But, we here in NE New England consider a long shot 75 yards. If I were to take up dusting critters at 300 + yards I would no doubt go with all the high tech bullets talked about on here. It all makes sense. I just got rid of my 308. Way I look at it, it can't possibly do anything more than my 30-06. And every time I reach for my 270 I put it back and take the 30-06. I'm starting to realize, I'm a 30-06 slut :) |
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@ 11:36 am (GMT) |
Shawn BevinsRe: Designed Operating fps Range of 270 and 7mm SST'sI live in upstate NY. Not every deer is 250lbs but I have taken more than a few in that range. Enough to know that a 243 might not be what you need when you see a bruiser. The amount of corn and alfalfa planted here along with the old apple orchards, feeds these deer pretty well. Hence the 300 yds shots. To be honest my preferred method of deer hunting is with a bow. Getting within 30 yds of a big deer is a rush that never gets old. When the snow hits the ground (and bow season is usually over) I grab the 270 and go into the thickets. The 06 has a royal following in the northeast. The deer hunting Benoit Clan use the 06 religiously. It wasn't too long ago that Remington had the $8 box sale for coreloks. Good reason to see so many animals taken with them. |
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@ 07:32 pm (GMT) |
Thomas PavelkaRe: Designed Operating fps Range of 270 and 7mm SST'sMy old Boss from Lockheed hunted with the Benoits last season. Seems they switched hunting area and were pounding the North side of Michigan almost into Canada.At one time they all used Rem 180 grain round nose core lokts. I believe Rem still makes them. That was/is one wicked woods bullet if there ever was one. There is something to be said for round nose bullets the way they set up when they hit game. Odd, that I know of, there are no Premium Bonded round nose loads in factory ammo? |
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