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Post by Deleted on Feb 23, 2015 17:37:05 GMT -5
Probably try both. Seems like the 209 primer route is working good enough so thats what Myers129 is going to make my barrel to use. 209's are pretty cheap and readily available. Seems like a no brainer. Pacnor barrel.
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Post by Dave W on Feb 23, 2015 19:36:44 GMT -5
Thanks for the trace info TG! SPML-if you go to the load info section and click on TGs trace thread, he has traced several duplexes already as well as straight powder loads. Rob mentioned earlier, that a few grains of booster can change pressures and velocity rather quickly so proceed with caution.
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Post by Deleted on Feb 23, 2015 21:22:01 GMT -5
TG thanks for the insight on pressure for the loads that Dave is shooting. Someone is trying a new combo everytime they are out with the .375's and we will have a good base soon for safe load development. I expect that the .375 mz's are going to be a little more individualized because there are so many bullets, powders being used, and what if any chamber is being utilized. Might be wrong but I think it will be harder to pin down a one load fits all for the .375's. Thanks to all of you that are putting rounds downrange! Stay safe.
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Post by Deleted on Feb 24, 2015 17:25:27 GMT -5
For those inquiring minds wondering about pressures in this load range for 375cal: 40X) K375 BlueDot/H1000 4/95gr 300gr .375cal tsx Full Form no wad 2/23/15 28in bbl. (Burn rate of H1000 is close to IMR7828) The load shown in the trace above seemed safe in this barrel under conditions present at the time of the test, but may not be under other conditions. TG Thanks TG, much appreciated as always.
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Post by rob67 on Feb 24, 2015 19:22:36 GMT -5
Good report Dave. Seems like the heavier bullets tighten the groups up. Maybe a bullet in the 320 to 330 grain range will be ideal for that twist and speed??
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Post by Deleted on Feb 24, 2015 20:15:53 GMT -5
Maybe a 350 matchking! If guy will drill the PFc before the next outing.
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Post by fishhawk on Feb 24, 2015 20:53:38 GMT -5
I have my .375 barrel now, I just have to find time to make the plug, chamber, etc.
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Post by Deleted on Feb 25, 2015 21:16:25 GMT -5
What is a PFC? Any updates on shooting?
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Post by Deleted on Feb 25, 2015 21:27:22 GMT -5
SPML, Primer flame channel by the newest nomenclature.
The boys better get out there and shoot as much as they want before I repo the beast for myself!
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Post by Deleted on Feb 25, 2015 21:35:31 GMT -5
SPML, Primer flame channel by the newest nomenclature. The boys better get out there and shoot as much as they want before I repo the beast for myself! More testing to come tomorrow, lots of new powders to be tried.. Then the PFC will get opened up, and more testing will be done next week.
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Post by jims on Feb 26, 2015 12:50:49 GMT -5
The results should be interesting.
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Post by Dave W on Feb 26, 2015 19:44:48 GMT -5
We planned on shooting much more today but Guy got called into work and he drove so we had to call it quits early. Still got a little data. Everything is the same as the other sessions, should have a 7/32 PFC to work with next time out. 375 Rem-Pac 1:12" twist 5 groove Full Formed bullets No Wads Fed 209A .040 Bushing OEM PFC Temp was 21* with wind chills in the low teens, blustery, unpleasant conditions. 260gr Nosler Partition Spizer 2 of the shots were with IMR 4831. Guy forgot to use the second hash mark on the reticle for the group so we had to roll with it since we only had 3 loads weighed out. Unfortunately one of the I4831 shots impacted with the same POI as the 3rd shot of so we couldn't get a true measurement on group size. At best .596, at worst .611 CTC. Nice shooting Guy! We ran two chronographs today and mine was 5-15fps faster on each shot but very consistent. We used his readings for the data.
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Post by Deleted on Feb 26, 2015 20:06:18 GMT -5
Good trigger pulling Lefty.
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Post by Deleted on Feb 26, 2015 21:26:46 GMT -5
Nice shooting guys, you are showing great promise for the guys that have the .375 itch.
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Post by Deleted on Feb 26, 2015 21:47:55 GMT -5
Definitely some promise showing with the 375, even tho testing is still in its early stages (for us), sorry it got cut short today, it was looking like a good day despite the weather, work has no mercy.. I must give cMc a shout out for gratiously lending us a test gun while ours are in the works.
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Post by Deleted on Feb 26, 2015 21:51:16 GMT -5
That's just totally awesome shooting. I will have one soon.
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Post by rob67 on Feb 27, 2015 5:10:47 GMT -5
The 4831 SC looks good. Was the speed close to the expected speed? A little fine tuning and the SC may be a real shooter. Good shooting Guy, and thanks for the report.
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Post by Deleted on Feb 27, 2015 7:20:37 GMT -5
If I remember right from talking to them the speed was about 40fps slower than calculated. That's pretty darn close considering the program was made to calculate cf cartridges.
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Post by Deleted on Feb 27, 2015 9:10:10 GMT -5
Thanks gents, yeah the speeds weren't far off, so that powder will definitely get some more bench time, it sure started out better than expected, since IMR4831 didn't do so well, we didn't have high hopes for the sc version, but just like everything else with these guns, ya just never know til you try it. Can't wait to get back out and try some more stuff, we have lots of powders and bullets we've not had the opportunity to test yet. I need every range session I can get to try to keep up with Dave's trigger skills.
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Post by Dave W on Feb 27, 2015 13:15:50 GMT -5
The 4831 SC looks good. Was the speed close to the expected speed? A little fine tuning and the SC may be a real shooter. Good shooting Guy, and thanks for the report. IIRC Rob, we were off by 3% on the velocity estimate.
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Post by rob67 on Feb 28, 2015 4:47:47 GMT -5
3% or 40 fps is very impressive for the 4831 SC. I'm going to have to find some of that powder.
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Post by Deleted on Feb 28, 2015 21:17:14 GMT -5
That's just totally awesome shooting. I will have one soon. Will this be your first smokeless build?
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Post by Deleted on Feb 28, 2015 21:25:10 GMT -5
I got all excited thinking there was an updated shooting post when I saw Ohioguy had posted.
Yes it will be my first .375 SPML.
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Post by elktaker on Mar 3, 2015 13:57:42 GMT -5
Myers on the board has been kind enough to lend Guy and myself a .375 to tinker with until our builds are completed later this year. He has his nose to the grindstone and no time to play. This barrel has a chamber so our first go round was a bust pretty much. Guy weighed the powder but I had the "dummy chamber" at my house, so all but one load was too small when we checked the loads before we left for the range. The one load we could test was 63gr IMR 3031. Timed 2708-2709-2697fps @ 36* with a .375 235gr Speer Hot Cor. Accuracy was poor, vertically strung 2.5" group. Today I got to play a little. Bumped the charge up to 64gr IMR 3031 with the same 235gr Speer Hot Cor. Velocity was, 2730-2762-2745fps @ 8*, with wind chill -8*. Too cold for this guy!! The first shot was cold fouled bore, no warm up foulers. Many times I have seen loads go to the recycle bin when the temps drop below 20*. The ES opens up and accuracy and velocity go south. Velocity went up slightly with the charge increase like it should have even in these very cold temps. That is encouraging to me, leading me to believe this may be a temp stable powder with light for caliber bullets. Only time and testing will tell for certain. Accuracy was not the greatest, but Myers believes this twist is more suited to longer, heavier bullets. He feels a 14 or 15" twist would better suit these short bullets. I also tried 65gr IMR 3031 with these bullets but the group opened up again. Have to see if 64gr is repeatable for accuracy. I tried a slower powder with some Sierra 300gr SBT Gamekings. The chrony quit working so no data was collected but I will include the group. .375 Rem-Pac 1:12" twist 5 groove Full Formed bullets No Wads Fed 209A .040 Bushing OEM PFC The top group is with the un-named load and 300gr Sierra SBT, .665" @ 100yds. The bottom group is with 64gr IMR 3031 and the 235 Speer Hot Cor, .915" @ 100yds. TG has some 3031 traces for the .375 in the trace section if anyone is interested. I just posted and am looking to have something similar but need to have 45 or 40 cal barrel for hunting to be legal then use sabots to 375. Who did your barrel and what brand is it? I have a large shank savage action the sitting in a xlr chassis waiting for a barrel. I could go .40 cal if I can locate 40 to 375 sabots which I think will preform better. My whole intention is for 260 gr accubonds and 1:12 twist. Probably go 30" bc when hunting I will have to utilize BP209. any input would be great. I just started a thread if you want to reply there.
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Post by Dave W on Mar 14, 2015 11:51:43 GMT -5
Had some problems getting any shooting done. Ice jam flooded the range, useable but it is a mess with debris and a couple inches of silt on the field. Nothing spectacular but got to try another powder. Everything remains the same with the exception of the PFC which is now 7/32". 375 Rem-Pac 1:12" twist 5 groove Full Formed bullets No Wads Fed 209A .040 Bushing 7/32 PFC Windy day, and to add to my irritation it was constantly changing direction and speed with temp at 50*. POI drifted off the target, only thing I can come up with is the change in PFC affected POI. Wanted to burn up some 3031 since the powder chamber has us handcuffed and I wanted to empty some vials. First group: 63gr IMR 3031 with a 260gr Nosler Accubond Timed 2682-2633-2584 Avg. 2633fps ES-98fps Not very good! This 3 shot cluster is circled in red.2nd group was: 64gr IMR3031 with a 260gr Accubond Timed 2678-2672-2662 Avg. 2671fps ES-16fps Pretty good ES but only grouped right at 1". 3 shot cluster is circled in green.Last group was with a new powder, Supposed to have the same burn characteristics a but with . If we can burn it efficiently, some high velocity with a 260gr bullet may be obtainable at pressure ranges we would like to stay in. Last group was: Timed 2798-2719-2725 Avg.2747fps ES-79fps Grouped at .9" CTC 3 shot cluster circled in orange.This will throw some wood on the fire, but this groups ES may have been influenced by a loose plug. After the second shot I noticed some debris on my notebook, assumed it was just the wind and dirt in the air. After the 3rd shot I noticed some teflon tape in the bolt area. Took out the bolt and sure enough, the plug was loose. Sorry for the cluster of groups but here is the damage.
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Post by Deleted on Mar 14, 2015 13:26:03 GMT -5
Nice work Dave, thanks for weathering the elements and doing some more testing.
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Post by Savage Shooter on Mar 14, 2015 13:28:29 GMT -5
IF.......IF 7828 is usable in application really need to think on the new RL23. Testing I have done with CF's it is a whole new game on reliable pressure, temperature sensitivity, low ES's and lot to lot consistency.
Much, much more temp stable than 7828!!!
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Post by TGinPA on Mar 14, 2015 14:56:00 GMT -5
So... If I were looking to test for maximum velocity, temp stability, the smallest powder volume, at the lowest pressure for 300gr 375cal bullets and had RL23, RL26, and RL33 to chose from, which should I start with and why? TG
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Post by hayman on Mar 16, 2015 11:00:35 GMT -5
Glad to see the 260 gr bullets flying pretty good especially the 3rd group.
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Post by Savage Shooter on Mar 18, 2015 13:12:21 GMT -5
So... If I were looking to test for maximum velocity, temp stability, the smallest powder volume, at the lowest pressure for 300gr 375cal bullets and had RL23, RL26, and RL33 to chose from, which should I start with and why? TG Reloder 23 is probably the most temp stable powder I have tested and burn rate is slightly faster than 7828, very near RL22 burn rate. I have no idea what ignition properties will be like with it in ML use, just caught my attention to see 7828 being used with 260gr bullets.
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