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OP
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Respectfully submitted to the Campfire brain trust:
115gr Nosler PTs that were recently on sale at SPS H100V based on jwall's recommendations
Tried loading 11 rounds, increasing 1/2 grain at a time and measuring the MV
Results:
42gr 2904 fps 42.5 2923 43 2982 43.5 2989 44 3030 44.5 3072 45 3100 45.5 3108 46 3152
stopped there as the bolt lift was getting stiff.
What do these data say to you with respect to where I should look for a node? TIA
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Joined: Dec 2004
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Campfire Ranger
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Campfire Ranger
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While Hodgdon does list 46gr as the max with that bullet and R-P brass, they got 100fps than you in their 24" test barrel. What barrel length do you have? I'd not push it beyond what you're supposed to be seeing, regarding velocity. Going much above that can only come at the expense of pressure.
Now with even more aplomb
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OP
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JPro
M70 FWT XTR, 22" bbl
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Campfire Ranger
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Gotcha. I'd knock off about 25fps an inch and expect 3,000fps to be a reasonable ceiling if H got 3,050 with their 24" tube. If it were me, I'd load about 43.7 and see what I could do for accuracy with a couple of different overall lengths. If you're shooting it in TX recently, then you're probably dealing with reasonably warm weather, so you should be good for pressure even if hunt temps get up to 85 or so. I'd try to shoot for accuracy on a cool morning with no wind.
Now with even more aplomb
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Campfire 'Bwana
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Campfire 'Bwana
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Don't forget about the 100 TTSX. Agree that H-100V is a velocity champ in the Roberts. This load really whacks hogs and WT's. BTW, note COAL for the LA, a bit much for a SA. Slightly more accurate in my gun (24" Brux barrel, Rem 700) was the 115 NBT over H-4350, although not as fast, more like 2,950 or so, it whacks'em, too. DF
Last edited by Dirtfarmer; 10/04/21.
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Joined: Apr 2011
Posts: 15,308 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: Apr 2011
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Respectfully submitted to the Campfire brain trust:
115gr Nosler PTs that were recently on sale at SPS H100V based on jwall's recommendations
Tried loading 11 rounds, increasing 1/2 grain at a time and measuring the MV
Results:
42gr 2904 fps 42.5 2923 43 2982 43.5 2989 44 3030 44.5 3072 45 3100 45.5 3108 46 3152
stopped there as the bolt lift was getting stiff.
What do these data say to you with respect to where I should look for a node? TIA
45 looks like where I’d try working with your data.
Semper Fi
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Joined: Aug 2010
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Aug 2010
Posts: 48,106 Likes: 8 |
Respectfully submitted to the Campfire brain trust:
115gr Nosler PTs that were recently on sale at SPS H100V based on jwall's recommendations
Tried loading 11 rounds, increasing 1/2 grain at a time and measuring the MV
Results:
42gr 2904 fps 42.5 2923 43 2982 43.5 2989 44 3030 44.5 3072 45 3100 45.5 3108 46 3152
stopped there as the bolt lift was getting stiff.
What do these data say to you with respect to where I should look for a node? TIA
45 looks like where I’d try working with your data. I'd shoot some groups and see what the rifle likes. If he's getting stiff bolt lift, that means it is about a grain too many. Maybe even more. Likely to be safe, a grain and a half. Where I'd start is 43, then work up from there. Not exceeding 44.5 grains. Find an accuracy node and OCW, then if need be, adjust oal. Also, regarding the partition: I'd run them at .020" off the lands and expect to find a good load in between 43-44.5 gr charge weights. If he's not, switch powders. H4350 or IMR4350 would be sure bets in the accuracy department.
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style. You want to see an animal drop right now? Shoot him in the ear hole. BSA MAGA
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Campfire Ranger
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Yeah, for sure. I was just looking at the OCW numbers he posted. Hard to tell what stiff bolt lift means. I look for a plateau where adding more doesn’t do much if anything to speed. Tends to work out to lower ES loads in my experience.
Always hard to judge others work and feel what they’re feeling.
Semper Fi
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Campfire Regular
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Campfire Regular
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My .257 Roberts shot better with those SPS 115 partitions with the stubby ogive than any other bullet I ever fed it. I posted about it a while back. I used Ramshot Magnum and it went consistently sub MOA. Never did that well before. After a bunch of trials I settled on 50.8 gr at 3000 FPS. Here's the thread where I wrote about it. There is some earlier work-up posts if you scroll up but the bottom-line, end results are here: Good .257 155 stubby partition loadCheers, Rex
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Campfire 'Bwana
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Campfire 'Bwana
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Yeah, for sure. I was just looking at the OCW numbers he posted. Hard to tell what stiff bolt lift means. I look for a plateau where adding more doesn’t do much if anything to speed. Tends to work out to lower ES loads in my experience.
Always hard to judge others work and feel what they’re feeling. Its smart to look for that plateau Scotty. You've been loading accurate ammo for a long time. I remember seeing your posts on the Nosler forums before here. I'm sure the OP appreciates your input..
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style. You want to see an animal drop right now? Shoot him in the ear hole. BSA MAGA
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Campfire Tracker
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OP
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Thanks much for the inpu, Gentlemen. I appreciate you sharing your expertise. Think I will nibble around, 43 and 43.5, the bolt lift at 46 was pretty stiff and 3150 seems likke a pretty optimistic MV for a Roberts. Tried earlier with 43gr of IMR4350 with different OALs. None were particularly good but 2.75" was the best.. So perhaps 43gr and 45.5gr at that OAL.
115gr PTs at just under 3000fps sounds like a real sweet spot for my needs.
Thanks again (wish I had some Ramshot Magnum!
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Campfire Tracker
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The 3 different Bobs I have owned all preferred 100 grainers over heavier bullets. So 100 NPs get to go hunting this year. I did use a 100 BT a couple years back with success.
"The significant problems we face cannot be solved at the same level of thinking we were at when we created them." Albert Einstein
At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".
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Thanks much for the inpu, Gentlemen. I appreciate you sharing your expertise. Think I will nibble around, 43 and 43.5, the bolt lift at 46 was pretty stiff and 3150 seems likke a pretty optimistic MV for a Roberts. Tried earlier with 43gr of IMR4350 with different OALs. None were particularly good but 2.75" was the best.. So perhaps 43gr and 45.5gr at that OAL.
115gr PTs at just under 3000fps sounds like a real sweet spot for my needs.
Thanks again (wish I had some Ramshot Magnum! Glad to see you chose the 43/43.5 gr range. I would have done the same. I'd go out and shoot 3-shot groups of 43, 43.2, 43.4 and see which gives you the smallest ES/SD. Don't even need to shoot on paper, rather paying attention to the lowest ES/SD. Pick the smallest and then go test COAL. I'd start .005" to .010" off the lands and shoot 3-shot groups in .025" increments off the lands. Velocities will be similar but will decrease a small amount as you get further from the lands. Some where in there you should see a, or several, smaller group/s. I've killed elk with a Nosler 115 running in the 2890 range. Have confidence you 115 will do anything you ask of it. Enjoy Alan
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
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Well, we can see why you are getting a stiff bolt: I'd be comfortable loading the Feather weight up to about 65K PSI.
Cartridge : .257 Roberts +P+ (not SAAMI)
Bullet : .257, 115, Nosler BalTip 25115
Useable Case Capaci: 47.495 grain H2O = 3.084 cm³
Cartridge O.A.L. L6: 2.775 inch = 70.49 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon Hybrid 100V
Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.136% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !
Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms
-11.4 92 39.00 2631 1767 41497 9895 98.7 1.277
-10.2 93 39.50 2663 1811 43115 9994 99.0 1.254
-09.1 94 40.00 2696 1856 44790 10086 99.3 1.232
-08.0 96 40.50 2728 1900 46532 10172 99.5 1.211
-06.8 97 41.00 2760 1946 48350 10251 99.7 1.190
-05.7 98 41.50 2792 1991 50242 10324 99.8 1.170 ! Near Maximum !
-04.5 99 42.00 2824 2037 52211 10390 99.9 1.150 ! Near Maximum !
-03.4 100 42.50 2856 2083 54252 10448 100.0 1.130 ! Near Maximum !
-02.3 102 43.00 2888 2129 56366 10499 100.0 1.111 ! Near Maximum !
-01.1 103 43.50 2919 2176 58562 10547 100.0 1.092 !DANGEROUS LOAD-DO NOT USE!
+00.0 104 44.00 2950 2223 60846 10592 100.0 1.074 !DANGEROUS LOAD-DO NOT USE!
+01.1 105 44.50 2982 2270 63222 10637 100.0 1.056 !DANGEROUS LOAD-DO NOT USE!
+02.3 106 45.00 3013 2317 65695 10681 100.0 1.038 !DANGEROUS LOAD-DO NOT USE!
+03.4 107 45.50 3043 2365 68270 10723 100.0 1.021 !DANGEROUS LOAD-DO NOT USE!
+04.5 109 46.00 3074 2413 70952 10764 100.0 1.004 !DANGEROUS LOAD-DO NOT USE!
+05.7 110 46.50 3105 2461 73747 10804 100.0 0.988 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba 104 44.00 2987 2278 64602 10448 100.0 1.049 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba 104 44.00 2909 2161 57092 10747 99.9 1.102 ! Near Maximum !
Last edited by antelope_sniper; 10/09/21.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Campfire Regular
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My 257 Roberts model 70 shoots the 115gr nosler partitions better than any other bullet. The load that came with the used rifle was 43.5gr of IMR 4350 at about 2925 FPS killed half dozen Antelopes with
That load. I got 3130 FPS using RL26, RL23 with 110gr Accubonds gave 3120 with 7.8 SD Win cases, CCI250 Primers OAL was 2.840. RL23 with 115gr Nosler Partitions and CCI primers R/P case
got 3129 FPS SD was 14.5. I also used MRP with the 115gr Bullets it has about the same speed as the RL23, don,t have it in front of me right now. I highly recommend the 115gr Nosler Partitions.
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