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June 17, 2020, 08:26 PM
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#1 | |
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Senior Member
Join Date: September 13, 2018
Location: FL
Posts: 634
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10mm Gold Dots & BE-86
I decided to try BE-86 for 10mm rounds. I'm using Speer GDHP 180-grain bullets.
I could not find a recipe, so I decided to start with Alliant's BE-86 recipe for Federal 180-grain JHP. The Federal bullet is 0.637" long. The GDHP is 0.630" long. I am keeping the OAL at 1.250". That tells me the cartridge volume will be bigger with GDHP bullets, presumably reducing pressure and velocity. Does that sound correct? I dropped back 0.4 grains from the Alliant recipe, to 7.8 grains. I got this result: Quote:
I am thinking I'll just increase the charge 0.2 grains at a time until I get to 1200 fps from this pistol. Seem reasonable?
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June 17, 2020, 11:49 PM
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#2 |
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Join Date: January 15, 2011
Location: Deep South
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Sounds like a reasonable 10mm plan. Should keep your brass in good condition.
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June 18, 2020, 10:13 AM
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#3 |
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Join Date: March 4, 2005
Location: Ohio
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It sounds like it is fine in your gun. But for anyone else reading, I want to point out that if you download the PDF version of Alliant's data, it tells you their "recipes" are actually maximum loads, and they operate on the assumption you will reduce them by 10% for your starting load. So they expect people to start at 7.0 grains with this "recipe" and work up.
In this instance, however, the Gold Dot, with its plated jacket, is a bit softer than a cup and core bullet, so it tends to produce lower start pressures. A Speer tech told me they often find they can run higher charges in Gold Dots than with the same-weight cup and core bullets, so there was at least a small additional safety margin in the bullet hardness in addition to the 0.007" extra powder space. The casual reader should be aware that starting with a middle load, though many do it, doesn't work out with all load combinations in all guns and can sometimes produce high-pressure signs. Therefore starting with the recommended starting load is generally prudent.
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June 18, 2020, 12:41 PM
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#4 |
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Thanks for the help. I should have gone through the fine print.
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June 19, 2020, 09:34 AM
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#5 |
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Join Date: May 2, 2015
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Your plan is sound, Swifty Morgan. From what are you shooting this load?
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June 19, 2020, 10:23 AM
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#6 |
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I use a Glock 29 with a Storm Lake barrel.
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June 22, 2020, 02:04 PM
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#7 |
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I am very pleased. I just put some rounds through the chronograph, and I got about 1190 fps with BE-86. The casings look fine, and the weird thing is that it doesn't feel as harsh as AA#7. I don't see how that can be possible, but it's true. I guess the burn rate has an effect on recoil.
I made a mistake and shot the wrong magazine first. I shot some old rounds full of AA#7 rounds. It worked out well, though, because it gave me a great basis for comparing recoil. The No.7 seemed harsh and snappy. The BE-86 seemed to go out with a friendly "pop," sort of like a .45 ACP. The spread on all shots was crazy tight. I'll post the results. First, the No.7. 06 22 20 10mm 180 GDHP AA#7 Old Digital Link Temperature: N/A Pressure: N/A Bullet Weight: N/A Number of Shots: 8 Minimum: 1188 Maximum: 1194 Spread: 6 Average: 1191 Standard Deviation: 2 Custom Attributes Caliber 10 mm Bullet Speer GDHP 180 grains Brass Starline new Powder No.7 Charge Check records OAL 1.260" Barrel Storm Lake Gun Glock 29 # Velocity Date 8 1194 6/22/20 1:34 PM 7 1192 6/22/20 1:34 PM 6 1192 6/22/20 1:34 PM 5 1190 6/22/20 1:34 PM 4 1192 6/22/20 1:33 PM 3 1191 6/22/20 1:33 PM 2 1188 6/22/20 1:33 PM 1 1191 6/22/20 1:33 PM Now the BE-86. 06 22 20 10mm 180 GDHP BE-86 Digital Link Temperature: N/A Pressure: N/A Bullet Weight: N/A Number of Shots: 6 Minimum: 1188 Maximum: 1191 Spread: 3 Average: 1189 Standard Deviation: 1 Custom Attributes Caliber 10 mm Bullet Speer GDHP 180 grains Brass Starline new Powder BE-86 Charge 8.0 grains OAL 1.250" Primer Federal 150 Barrel Storm Lake Gun Glock 29 # Velocity Date 6 1189 6/22/20 1:38 PM 5 1191 6/22/20 1:38 PM 4 1188 6/22/20 1:38 PM 3 1188 6/22/20 1:38 PM 2 1190 6/22/20 1:38 PM 1 1190 6/22/20 1:38 PM I am reluctant to go too fast, because I've seen people complain about the way this bullet performs at 1300. I originally wanted 1250 from the short barrel in the Glock 29, but if I go that high, I may hit 1300 in the Glock 20. The speed went up by around 100 fps when I added 0.2 grains, so I don't know if it's even possible to increase the charge without breaking 1300 in the longer barrel. I got good velocity, pleasant recoil, and suppressed flash. This looks ideal.
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Selling a gun is like selling a child, without the relief over not having to pay for college The Bill of Rights was written largely to prevent rudeness. Infringement doesn't have to be catastrophic to be intolerable. Last edited by Swifty Morgan; June 22, 2020 at 02:45 PM. |
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June 22, 2020, 04:54 PM
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#8 |
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I decided to try 8.1 grains before quitting. I got 1590 fps, suggesting something MIGHT be wrong with the chronograph. The manual says to paint your bullets black on bright days, so I did that. With 8.1 grains, it gave me 1100 fps, or 90 fps SLOWER than 8.0 grains.
No idea what's going on. At least I didn't get pressure signs.
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June 22, 2020, 05:27 PM
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#9 |
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Join Date: September 13, 2018
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This keeps getting more interesting.
Someone on another forum had a problem with Power Pistol and 180-grain 10mm loads. The velocity peaked at a certain charge weight and then dropped. Power Pistol is the base for BE-86, so if Power Pistol behaves this way, it would make sense for BE-86 to do the same thing.
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