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Post by Dave W on Feb 16, 2015 22:27:58 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. |
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Post by Deleted on Feb 16, 2015 23:24:03 GMT -5
Under MOA isn't too shabby for freezing your giblets off and your first time pulling the trigger on someone else's rifle  Thanks for sharing, you already have more shots fired than I did in the 5 months I had it in the safe. Maybe next outting you'll try that retumbo charge I've been pleading for?   |
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Post by Deleted on Feb 16, 2015 23:37:41 GMT -5
I like it!
Great outing with the .375!
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Post by rob67 on Feb 17, 2015 6:54:28 GMT -5
Good shooting and great info on 3031 powder.
3031 may be a good choice for a booster with the slower powders in the .375. In my testing 4759 has been to unpredictable for a booster. I have tried 4759 5g and 7g with not much difference in speed, then tried 10g and speed jumped up 300fps. this was using 4350 as main powder.
I also think the 12 twist maybe to fast for the light bullets. I haven't tried anything heavier than 250g so I dont know for sure. When my new barrel gets done I'll have a better idea on twist rate.
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Post by Deleted on Feb 17, 2015 9:35:28 GMT -5
Good shooting in those conditions Dave and for this early in the game with the .375, That's looking up from where we started for sure. Cole, I will try your T-Rex loads next time out.
We have a good bit more of testing to do with powders and bullets, hopefully we can find some good and reliable cold weather loads. Pretty impressive so far, as far as ignition is concerned, somewhat slower powders and 0 misfires, while using an OEM .040 bushing plug. Again, cudos for shooting in this weather.
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Post by mrbuck on Feb 17, 2015 12:02:55 GMT -5
Nice shooting ! Too much snow on the ground to even think about getting to the range in this neck of the woods .
Chris
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Post by jims on Feb 17, 2015 12:59:42 GMT -5
It appears there are a few .375s out there. It will be interesting to see how they compare/differ and what turns out to be the "ideal" load combo.
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Post by Deleted on Feb 17, 2015 16:25:33 GMT -5
Following with great interest, I see a .375 on the horizon in the near future..
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Post by Dave W on Feb 17, 2015 17:37:59 GMT -5
It appears there are a few .375s out there. It will be interesting to see how they compare/differ and what turns out to be the "ideal" load combo. 260 or 300 Accubond 26-2900fps is on my wishlist. Thanks guys! Rob, would you be willing to PM me the 4759/4350 details? If not, completely understand. |
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Post by Deleted on Feb 18, 2015 5:13:46 GMT -5
Wow a .375 SPML!!! Awesome idea.
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Post by rambler on Feb 18, 2015 8:45:04 GMT -5
I'm gonna bite, what does 'spml' stand for?
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Post by jimmmy on Feb 18, 2015 9:40:11 GMT -5
I'm gonna bite, what does 'spml' stand for? Let me take a guess. Smokeless powder muzzle loader. |
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Post by rambler on Feb 18, 2015 10:03:17 GMT -5
I'm gonna bite, what does 'spml' stand for? Let me take a guess. Smokeless powder muzzle loader. or smokeless propellant muzzle loader...or seriously powered muzzle loader....  |
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Post by floormat1957 on Feb 18, 2015 11:17:15 GMT -5
Superior performance muzzle loader
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Post by Deleted on Feb 18, 2015 20:59:19 GMT -5
[/quote]260 or 300 Accubond 26-2900fps is on my wish list[/quote]
Size em up, let's shoot some Noslers this weekend, and some big boomers to make the gun owner happy.
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Post by Deleted on Feb 18, 2015 21:04:09 GMT -5
Let's get a video of Guy jumping out of his shorts when he shoots the 350's too!
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Post by Deleted on Feb 18, 2015 21:05:55 GMT -5
Everyone would enjoy that for sure.
Especially Dave.
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Post by Deleted on Feb 19, 2015 6:53:31 GMT -5
Myers129
Do you have these 375 SPML barrels or would I have to order one from somewhere?
SPML
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Post by Deleted on Feb 19, 2015 10:17:16 GMT -5
Welcome spml, Cole may be able to hook you up with a .375 barrel, or order you one if he doesn't have exactly what you're looking for.
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Post by Deleted on Feb 19, 2015 10:25:22 GMT -5
Spml I sent you a pm. I do have a variety of pacnor 375's yet.
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Post by Dave W on Feb 20, 2015 13:19:54 GMT -5
Look what I got Guy, 260 Accubonds. Sierra 300gr SBT beside it.  |
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Post by Deleted on Feb 20, 2015 15:07:27 GMT -5
Look what I got Guy, 260 Accubonds. Sierra 300gr SBT beside it. Great, I can't wait to shoot them up.. |
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Post by Dave W on Feb 22, 2015 19:32:15 GMT -5
Little more data picked up today, temp was 30*. .375 Rem-Pac 1:12" twist 5 groove Full Formed bullets No Wads Fed 209A .040 Bushing OEM PFC 300gr Sierra SBT  Nothing spectacular, if the wind and ES had been more kind, would have been a little better. This is a very old lot of powder, price was $12.40 a pound back whenever it was bought. |
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Post by Deleted on Feb 22, 2015 21:15:52 GMT -5
For just starting out with those loads the results are great!
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Post by Deleted on Feb 22, 2015 21:30:36 GMT -5
Thanks for doing the testing for me Dave, I thought ohioguy was gonna help too but he must be busy. Indeed starting out under MOA with a fast twist barrel is very impressive on all accounts. Glad to see you are shooting that well before any duplexing is tested to see if it's even needed anymore.
Thanks for testing the retumbo for me, now that we know it will ignite I know we will get the primer balance figured out and it will be a cakewalk after that.
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Post by Deleted on Feb 22, 2015 23:42:20 GMT -5
He must of forgot to call... looks like I'll have to sneak down there and take the gun if I want to shoot it any more... All kidding aside, good shooting Dave, sure is interesting testing the 375 and results are pretty good already. Looks promising for the future. |
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Post by Dave W on Feb 23, 2015 11:33:48 GMT -5
If you shot from the correct side of the bench, I would have called you. |
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Post by TGinPA on Feb 23, 2015 12:25:55 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 |
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Post by Deleted on Feb 23, 2015 15:04:33 GMT -5
Anybody tried boosting to make these bullets fatten up quicker? Thats my plan when Myers129 gets my barrel done.
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Post by Deleted on Feb 23, 2015 15:25:09 GMT -5
Anybody tried boosting to make these bullets fatten up quicker? Thats my plan when Myers129 gets my barrel done. SPML, are you planning on shooting land riders or full form bullets? What barrel and specs are you going with? |
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Thanks for sharing, you already have more shots fired than I did in the 5 months I had it in the safe. Maybe next outting you'll try that retumbo charge I've been pleading for?
