View Full Version : 10MM/.40Cal Bullet Design *180gr or 200gr"
robertbank
09-25-2021, 01:38 PM
I am currently looking at two mold designs from Accurate Molds. I am trying ti balance practice vs serious use. My plan is to use 40cal brass for practice/playing IDPA and carry 10MM brass for serious work using my GP-100 revolver.
The only parameters at this point are the design has to be plain base. I have a Gas check maker from Pat Marlin and intend to apply GC's tp the base of the bullets most of the time. I will be sizing the bullets .401. I will be asking for a min diameter of .402 using WW alloy.
I am looking at two designs right now. the 40-215F and the 40-189B. Not sure if these are the best two and would appreciate any thoughts you guys might have.
https://www.accuratemolds.com/bullet_detail.php?bullet=40-180B
https://www.accuratemolds.com/bullet_detail.php?bullet=40-215F
Take Care
Bob
popper
09-25-2021, 03:31 PM
I use a PB 165gr TC PB in 40 autoloader, @ 950 fps goes end to end through 150# hog. Don't know what you are protecting from but 220 in 10mm is 400#-ft vs 350 in the 40. Not a lot of gain.
Taterhead
09-25-2021, 10:10 PM
I own or have owned 7 or 8 different 10mm mold profiles. My everyday is an LBT 401-175-TC. The Lee of similar moniker and the Lyman 401638 are also good (although the Lyman mold didn't work well for me). No doubt Accurste has something similar.
https://i.postimg.cc/Z51Wb5vM/20201227_200009.jpg
If long loading in 40 S&W cases, I like this 40-200F. Profile works well for that and also is great in 10mm cases.
https://i.postimg.cc/J44sJtRJ/20210824_103802.jpg
For wilderness carry, this LBT 402-200-WFN is awesome. I have the GC version too at 209 gr. Accurate makes a similar profile designed by our own fredj338: 40-195G.
https://i.postimg.cc/Gtq4XCMp/20210325_110748.jpg
Edited to add that I find a GC in 10mm to be unnecessary for the heavier bullets. Maybe if zipping 135 grainers at 1600+ fps, but not for 180-200+ gr. I load my 203 gr WFNs to 1250 fps and PB and PC is good-to-go.
10sandxs
09-25-2021, 11:22 PM
I shoot the lee version of taterheads red ones. Always for plinking as I don't compete in run and gun (I shoot bullseye). I'm running them now in a recently acquired smith&wesson 610 in 40 and they are very accurate, at least out to 50' indoor range I typically shoot at. Haven't shot them in 10mm...
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Taterhead
09-26-2021, 12:38 AM
More 10mm bullet pics. Here are some of the 10mm bullets I've cast.
Left to right
Accurate 40-200F
LBT 402-200-WFNGC
LBT 402-200-WFN
NOE 403-180-RF
Lee 401-175-TC
Lyman 401638
Feel free to inquire about my experiences with each.
All shot in Glocks mostly.
https://i.postimg.cc/TwngS1KK/20190206_205321.jpg
robertbank
09-26-2021, 01:04 AM
Taterhead what I am looking for is a PB bullet. I have it in my head I might be able to solve the annoying leading I get in the first 1/8th" of rifling when using 40cal cases containing the Lyman 401638 in my 10MM GP-100 by using a PB GC on the PB Bullet. I have a large supply of 40 cases and would like to shoot 40 cal for practice and occasionally for playing IDPA SSR Division. For Wilderness Carry I think I am better served with a 200 gr bullet with a wide meplat in 10MM. That said there is the practical annoyance of budgets and how much I want to invest i this project. I am beginning to think a 180 to 195 gr bullet might well do both. Your thoughts?
Take Care
Bob
Taterhead
09-26-2021, 01:21 AM
I don't shoot 10mm in a revolver, but can say that none of the bullets I referenced lead my autoloaders, no matter the base. Mine are all PC or HT.
Are your cylinder throat diameters > groove diameters?
Burnt Fingers
09-26-2021, 01:50 PM
Taterhead what I am looking for is a PB bullet. I have it in my head I might be able to solve the annoying leading I get in the first 1/8th" of rifling when using 40cal cases containing the Lyman 401638 in my 10MM GP-100 by using a PB GC on the PB Bullet. I have a large supply of 40 cases and would like to shoot 40 cal for practice and occasionally for playing IDPA SSR Division. For Wilderness Carry I think I am better served with a 200 gr bullet with a wide meplat in 10MM. That said there is the practical annoyance of budgets and how much I want to invest i this project. I am beginning to think a 180 to 195 gr bullet might well do both. Your thoughts?
Take Care
Bob
If the same load doesn't lead using 10mm cases I think you have your answer.
The bullet is most likely tipping in the cylinder and entering the throat a bit crooked. That's going to cause leading no matter what.
robertbank
09-26-2021, 07:30 PM
Taterhead Yes to cylinder size, just. Like you, I don't get leading in my 40cal pistol. I do get some in my 10MM resolver when using 40 cal brass Burnt Fingers who posted after you may have the explanation for the leading. I hope not but think he may be right. Once I decide on a FB bullet and cast some I won't know if my GC idea is going to work. I most certainly will post my results here. Right now the 40-315F would seem to be my best bet but I have not made up my mind. I will be back to you on some questions I have regarding your experiences with your bullets early next week.
Thanks to you and the others for your replies. Hope to get a fes more responses before I open the wallets up.
Take Care
bob
FlyfishermanMike
09-27-2021, 12:44 AM
I have this one:
http://arsenalmolds.com/image/cache/catalog/403-200%20Gr%20WFN-PC-500x500.JPG
http://arsenalmolds.com/bullet-molds?product_id=161&limit=99999999999
Hard to beat the Lee 401-175-TC for plinking.
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robertbank
10-02-2021, 12:59 PM
I did get some leading using the lead bullets in 10MM brass so I suspect Burnt Fingers may have explained the leading issue. I don't yet have a 200 grain mold to see whether it is just the bullet design that is the issue. Time will tell as I am pretty intent on getting a 200 gr mold for the revolver. One other thing to consider is the Ruger cylinder design. It has a very sharp ridge in the cylinder to allow 10MM brass to be used in the gun without the need for clips. Using the shorter 40 cal brass and the pbviosl;y shorter caertridge might result is some slight shaving of the bullet if it were to hit the ridge just right. Just a gues on my part. Any shaving of the bullet might result in some gas cutting.
I think I have more work to do before i decide either to live with a bit of leading in the revolver or just not use 40 cal brass. The story continues. Anyone have any further ideas feel free to jump in. I am not sure how many 10 MM revolver shooters are out there., I suspect not many.
Take Care
Bob
JAC43
10-02-2021, 02:06 PM
Have you measured the cylinder throats on your GP100? What were they out of curiosity. Mine pass a.402" minus gauge easily.
robertbank
10-03-2021, 01:29 AM
Have you measured the cylinder throats on your GP100? What were they out of curiosity. Mine pass a.402" minus gauge easily.
Mine allow a .401 sized bullet to pass through them with ease. I checked early as my .357 GP-100 had three undersized cylinder throats put of six. When I get my 200 gr 10MM bullet mold I will try loading the bullets long in 40 cases for practice. My idea will be to just get a portion of the side of the bullet resting beyond the step in the chamber.
Take Care
Bob
Outpost75
10-03-2021, 06:44 PM
My Accurate designs used in 10mm Ruger Blackhawk are 40-182H, 40-220H and 40-224H. Also use the 40-182H in .38-40 and .40 S&W.
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