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Re: 115 Partitions .525 Ogive [Re: southtexas] #15995467 04/15/21
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Just yesterday I shot this bullet from my Ruger Hawkeye 257 Roberts.
The temperature was 74F, with a slight wind from SW. (today its 41F
raining with wet snow predicted to follow tonight and tomorrow.)
I sighted in last week in back of my house at 1 1/2" hi at 100yds. First shot at
a chuck was a little left (misjudged the wind?). I waited about 10-15
minutes and he came about halfway out of the den. Next shot DRT
range 326 yds. Big old male, really destructive round. Think I'll
get another couple hundred of these bullets. SPS says 'blems',
but I can't see anything wrong with them. Load data;W-W case
IMR4350 -45.5 grains three five shot groups 1.1" 1" 1.3" with
6x scope. Gun is capable of more accuracy than this old
shooter.
Old Cuss

BP-B2

Re: 115 Partitions .525 Ogive [Re: southtexas] #15997260 04/15/21
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Nice shooting! And thanks for the load.
Rex

Re: 115 Partitions .525 Ogive [Re: oldcuss] #15998811 04/16/21
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Re: 115 Partitions .525 Ogive [Re: Goosey] #16017124 04/21/21
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Originally Posted by Goosey
Originally Posted by southtexas
Thanks, that looks reasonable. How did you arrive at that number?


Did some comparing to similar bullets, the 115 TSX is .320, the discontinued 117 Sierra flat base is .351 (Applied Ballistics #s). The TSX .527" ogive and the Sierra .506".


what a dumschit


trans gender non binary transcendent mermaid queen-king
Re: 115 Partitions .525 Ogive [Re: ribka] #16017213 04/21/21
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Originally Posted by ribka
Originally Posted by Goosey
Originally Posted by southtexas
Thanks, that looks reasonable. How did you arrive at that number?


Did some comparing to similar bullets, the 115 TSX is .320, the discontinued 117 Sierra flat base is .351 (Applied Ballistics #s). The TSX .527" ogive and the Sierra .506".


what a dumschit


Thanks ribka.
What is your estimate of what the actual BC ought to be? And how did you arrive at it?

IC-A

Re: 115 Partitions .525 Ogive [Re: ribka] #16018551 04/22/21
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Originally Posted by ribka
Originally Posted by Goosey
Originally Posted by southtexas
Thanks, that looks reasonable. How did you arrive at that number?


Did some comparing to similar bullets, the 115 TSX is .320, the discontinued 117 Sierra flat base is .351 (Applied Ballistics #s). The TSX .527" ogive and the Sierra .506".


what a dumschit


what a classy comment...

Re: 115 Partitions .525 Ogive [Re: southtexas] #16024787 04/24/21
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I just shot some out of my Roberts. W760 and R19 gave the best results. I went to order some more but for the life of me can't figure out how to get the military discount applied. Anybody else tried this??

Re: 115 Partitions .525 Ogive [Re: GSPfan] #16025228 04/24/21
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Originally Posted by GSPfan
I just shot some out of my Roberts. W760 and R19 gave the best results. I went to order some more but for the life of me can't figure out how to get the military discount applied. Anybody else tried this??


Should be automatically applied once you've logged in. I'm assuming you've been verified. Been a while since I last ordered from SPS but you might not see it until you go all way to the final purchase screen.

Re: 115 Partitions .525 Ogive [Re: southtexas] #16025364 04/24/21
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As I recall, early on, I had to send them a DD214 to get verified (or some similar process) and then it auto-applies when I log in. Sometimes "sale" items don't get the discount. And for a brief period over a year ago, it was like they dropped my veteran status, but a phone call got it reinstated with no more paperwork.

Hope that helps,
Rex

Re: 115 Partitions .525 Ogive [Re: TRexF16] #16025372 04/24/21
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I just tried. entered my name, active duty date, and discharge date. And it says i'm qualified

IC-B

Re: 115 Partitions .525 Ogive [Re: southtexas] #16025801 04/24/21
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I'm verified. Got an e mail from sheerID.com their military verification team. Maybe it takes a day or so.

Re: 115 Partitions .525 Ogive [Re: southtexas] #16026792 04/24/21
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Glad to hear it worked out Brothers.
Outfits that respect our service are much appreciated. A win-win for us all.

Re: 115 Partitions .525 Ogive [Re: southtexas] #16027308 04/25/21
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I wouldn't say it's worked out yet. Logged on this am and the discount wasn't available. I'll probably try calling them tomorrow.

Re: 115 Partitions .525 Ogive [Re: southtexas] #16027501 04/25/21
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I haven’t tried to order lately, but the last time I tried to order a “SALE” item, it prompted me that double discounted pricing was not available. Lowe’s has become the same way. If it’s on sale, no additional vet discount. At least at store near me. Happy Trails


Life Member NRA, RMEF, American Legion, MAGA. Not necessarily in that order.
Re: 115 Partitions .525 Ogive [Re: southtexas] #16027525 04/25/21
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Hammer bullets go by the honor system for vet and first responders. If you say you are than you get the discount. I wonder how long that will go on?

Re: 115 Partitions .525 Ogive [Re: southtexas] #16038321 04/28/21
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I tried these .525 ogive 115 NPTs out today in my .257 Roberts and I was very pleased!
My rifle is an old Rem 722, with a 6X Leupold M8 scope, and a repurposed short-action Rem 700 ADL beechwood stock I fit to it (floated after the first 2" of barrel shank), since its original stock had been cut back very short at some point in its life.
I checked the fit of the ogive to my rifle's throat and was happy to see that when seated to .025" off the lands (2.81" COAL), the mouth of a case trimmed to the standard 2.223" lands smack in the center of the cannelure. It seems a perfect fit to this cartridge (I did not crimp my test rounds).
Mule Deer made a recommendation for Ramshot Magnum in the Roberts over on the Sisk thread on how much he loves Big Game, and I decided to try out Magnum, since I have 10 pounds of it on hand.
Case full of Magnum!
I did not use anywhere near as much as was referenced above but I still got a lot more velocity than I expected.
I couldn't find any pressure-tested data for the 115 NPT with Magnum, but Ramshot lists a max of 51.1 gr with the 117 Sierra, providing 2900 FPS with only 56.5K PSI. With the slightly lighter bullet, +P cases, and a rifle capable of handling 65K PSI, I felt pretty comfortable going a half grain over that as max for my little first test run. Here's the load:

Older, once-fired Federal +P .257 Roberts cases (from the days of the red primer sealant), old white-box CCI 250s, the .525 Ogive 115 gr .257, and 49, 50, 51, and 52 grains of Ramshot Magnum. COAL was 2.81", putting the bullets .025" off the lands.

3-shot groups are at 100 yards. Temp was 60F. Velocities surprised me:
49 - 2910 FPS, SD 11, 1.16"
50 - 2984 FPS, SD 15, 1.07"
51 - 3019 FPS, SD 6, 0.80"
52 - 3071 FPS, SD 8, 0.90"

I almost didn't fire the last three rounds due to the exceptional velocities, but there were just no other pressure signs whatsoever. I used my little finger to open the bolt from the firing position on all the shots and they all felt the same, but there is no getting around the fact that those are some way higher speeds than I am used to! But, then again, the highest published data for the Roberts I have run into is 58K PSI. I will try the 51 gr load again, and I will use the same cases again as today's 51 and 52 grain loads to be sure I keep tight primer pockets. Mule Deer got around 2950' with Magnum with the 120 Partition so I reckon 3019' with the 115 is not too out of line. I also have some new Fed +P cases and can do a check of CHE as well - not the end-all, but it's one more piece of data to consider.

If somebody here can run Quickload, I can measure the parameters needed for the run - just PM me what is needed. I'd probably need to convert the COAL to what it would be with the "normal" 115 NPT loaded with its base at the same point as the .525's base, since I doubt Quickload has the .525 in its database.

Looking forward to reading what others learn about loads for this bullet.

Cheers,
Rex

Re: 115 Partitions .525 Ogive [Re: southtexas] #16038333 04/28/21
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[Error post]

Last edited by TRexF16; 04/28/21.
Re: 115 Partitions .525 Ogive [Re: southtexas] #16040232 04/29/21
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Still puzzling over the higher than expected velocity, I checked the diameter of these SPS partitions. It seems fine at .2568". I tried slipping one into a fired case mouth and it took a pretty good bit of force. So I checked the diameter of the Barnes 100 TSXs that I've been using since I first got this rifle 15-20 years ago, and they are .2565" - not really enough to matter I'm thinking, but I could be wrong. From checking case mouth variance, I already knew my case mouth walls run .014-.015", which is a little on the thick side, so I think I will give them a light turning and see if that gives a little smoother slip fit of a bullet into the fired case after the next rip to the range. Perhaps the neck is being pinched a bit in the chamber.
BTW, I deprimed with a Lee universal deprime die, sized the cases using an RCBS FL die with the decapping/expanding rod removed, then expanded the necks with a Sinclair expander mandrel, which put them only .002-.003" under bullet diameter prior to seating the bullet, if that makes any difference.

Happy shooting,
Rex

Re: 115 Partitions .525 Ogive [Re: southtexas] #16040953 04/29/21
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Rex, that is outstanding information. I’m in the midst of developing loads for this exact bullet in my .257 Rob & 25-06 and value your efforts a lot. I’ll make sure to add my results to this thread next week once this rain stops in VT and I can get out shooting. Somehow (I blame @Dirtfarmer :-)) for encouraging the purchase of what looks like 1600 of these little .525 115gr .257 devils.

Happy that you got velocity & accuracy in one package.

Re: 115 Partitions .525 Ogive [Re: southtexas] #16041048 04/29/21
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I had 250 qty arrive today from the SPS. Looking forward to trying them in the 2.8” Rob.


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