Yes, I just added it in
Absolute Hammer load data
- Thread starter RockyMtnMT
- Start date
Help Support Long Range Hunting Forum
Hey keep your testing going on that cartridge. APR is making me a 6.5 prc now and your shooting the bullet i plan on shooting in it.
Based on what I've seen the Hybrid 100v/StaBall 6.5 to Superformance/IMR 4955 window seems to be the best for this combination. Of the two I would take either StaBall or IMR 4955 as the others are more temp sensitive, H4831SC could work but it pressured out at 3220 in my tests.
Honestly my barrel definitely has a node around 3400 fps but it takes hot loads to get there and the other two rifles I'm loading for both pressure out well before that. If I look at the StaBall loads in the three rifles my brother's Xbolt hits pressure first at 58.3, my dads defiance with Carbon six barrel hits at 58.9 and my Mausingfield with proof prefit doesn't hit until 59.5.
Not entirely sure why but my 24" proof is about 20 fps faster than the 26" Xbolt barrel for a given charge weight.
I think I'm going to take the 4955 loads and run from 58 to 59.5 though each rifle to see what I get as far as speed and accuracy next weekend. Worst comes to worse I'll simply run a separate load for my rifle to get the extra performance boost over the other two.
Below are my 51, 58.3 and 59.5 loads in that order.
I think I could live with that. I have some H4895 may try also.
Let Her Eat
Excellent study and observations.
Brass looks good!
Ya'll have me anxious to get my 6.5 Sherman Max to start load development. I'm also going to do the 129s - just need the rifle
Brass looks good!
Ya'll have me anxious to get my 6.5 Sherman Max to start load development. I'm also going to do the 129s - just need the rifle
Savage 110 LA
IBI 24" 1-7.5" twist
chambered in 280 AI
154 AH deadblow
Fed GM215M
H100V
55gr-2960 FPS
56gr-3011
57-gr-3040
58gr-3093
59gr-3125
Primers seemed to flatten even on the 55 gr starting load? Might be able to go higher in powder charge, but I'll shoot for groups next time I'm out.
6.5 Sherman
28" Hart 8 twist
Borden timberline
H100V
Fed GM215M
123 AH
56gr-3265
57gr-3332
58gr-3381 over pressure almost blew a primer.
59gr-didn't shoot
Disappointed with my results on this test. I thought I'd get the 123 AH going 3500+ FPS. Will try to test a different powder. Any other burn rates you guys would recommend? My previous load was a 140 Berger with 64 gr of N570 at 3339 FPS. As you can see I'm only getting the 123 AH to this speeds with H100V.
IBI 24" 1-7.5" twist
chambered in 280 AI
154 AH deadblow
Fed GM215M
H100V
55gr-2960 FPS
56gr-3011
57-gr-3040
58gr-3093
59gr-3125
Primers seemed to flatten even on the 55 gr starting load? Might be able to go higher in powder charge, but I'll shoot for groups next time I'm out.
6.5 Sherman
28" Hart 8 twist
Borden timberline
H100V
Fed GM215M
123 AH
56gr-3265
57gr-3332
58gr-3381 over pressure almost blew a primer.
59gr-didn't shoot
Disappointed with my results on this test. I thought I'd get the 123 AH going 3500+ FPS. Will try to test a different powder. Any other burn rates you guys would recommend? My previous load was a 140 Berger with 64 gr of N570 at 3339 FPS. As you can see I'm only getting the 123 AH to this speeds with H100V.
What was your case fill on the H100V in the Sherman
My 6.5-06AI did pretty well with RL 23 and Superformance. Both got to or close to 3500, but accuracy was at 3400ish.
I tried superformance in the PRC and while it was the fastest initially I lost 70 fps going from 75 degrees to 45 degrees which is why I tried 4955 which is supposed to be more temp stable.
Wasn't to bad. I never filled a case to bottom of the neck. But if I guessed I'd say 64-65 gr would be close to the bottom of the neck. I thought the H100V would work as guys on this page using 6.5-06AI and 6.5-280AI had good results with H100V. The Sherman is similar to these and not enough different that I would of thought this powder wouldn't work. Was thinking I'd try H4831SC next time. But I'm open to other suggestions from the experts.
H4831 would be where I would go next
If you can find IMR 4955 that would be worth a shot as well, I found I got better velocity out of that than H4831SC in my 6.5 PRC. As a bonus it seems like not many people are shooting it so it should be easier to find.
Also I did notice that I started getting clickers in this last test and some of the cases were difficult to chamber despite being run through an RCBS FL bushing die run all the way down. Next time I get a chance I'm going to run each of the sized cases through the rifles and separate the ones that are tough to chamber. That way I can keep the tough ones for range brass and save the others for hunting.
I should of mentioned I'm using 270 Nosler brass. This was the first firing after they were fire formed. This gun or the Sherman seems to hide pressure and you can't "sneak up on it". Everything is good until it's not! I don't need to run at MAX, but should get the 123 AH running faster than a 140 Berger. These bullets I'm sure will shoot as all shot very well and impacted in the same group. Might just take some experimenting.
