50 GI Bullets

Turns out it is harder than I expected to find projectiles for the 50 GI. Even though there are a fair number of 50 caliber choices, many of them are for magnums, and too heavy or long. Here are the bullets I’ve found, and measurements to help extrapolate to a different bullet. Anything in a table is a real measurement I took myself.

To compare how much a bullet design would weigh if it were exactly scaled down to be 45 ACP-diameter, multiply by 0.7295 = (0.451/0.501)^3.

Go here to see how the bullets actually shot.

Interestingly, except for the SWC shape, there is a strong (R^2 > 0.91) correlation between the overall length of a bullet and it’s weight. I did not expect so much correlation. Since the diameter of a bullet is tightly controlled to less than 0.001″, usually by pushing an oversized bullet through a sizing die, it makes some sense that most dimensional variations will be squeezed into variations in height. But weight differences can be caused by other things, like differences in alloy, bubbles, and nose geometry too. …The strong correlation still surprises me.

TODO: I suspect the rim-thickness (not OAL) of the SWC will still correlate strongly, but need to measure it.

๐Ÿ‘ Rim Rock 255 grain SWC โ€“ย basically a scaled-up H&G #68 (classic 45 ACP 200 grain bullseye bullet), but 5% to 7% lighter. Nominal specs: OAL 0.656, Meplat 0.281, No crimp groove. Excellent all-around bullet.

I measured one rim to be 0.333″ thick

255gr SWC (Rim Rock)
OAL Grains
0.6590 ???
0.6550 257.8
0.6545 256.0
0.6555 256.5

.50GI 275gr
Jacketed Hollow Point. Made by Ranier for Guncrafter Industries, and only sold through GI. $0.23 each (6/2018). It has a cupped base

275gr GI JHP
OAL Grains
0.6305 273.8
0.6315 274.1
0.6245 272.3

๐Ÿ‘ Berry’s 300 Grain plated “Round Shoulder”. Squatter design than the GI 300 grain bullet. It is slightly shorter and has a bigger meplate. Should hit harder but have more drag.

300gr RS Berry
OAL Grains
0.6260 300.8
0.6260 300.7
0.6245 300.2
0.6250 300.4
0.6245 300.3

50GI 300 grain Jacketed Flat Point. Made by Ranier for Guncrafter Industries, and only sold through GI. $0.22 each (6/2018). It has a streamlined profile and a cupped base.

300gr GI/RAN-FP
OAL Grains
0.6735 299.7
0.6730 299.3

Hunters Supply 325 Grain Lead Flat Nose (#0150132540). I would call it a truncated cone (TC) shape. Nominal specs “6% antimony, 2% tin and 92% lead with a Brinell hardness of 15 rated to 1600 fps without gas checks.” Meaplate approx 0.35″ to 0.36″. Each bullet had a fairly large sprue, so I am not confident in the OAL measurements. MSRP $22.99/50 $79.9/250, but MidwayUSA has them for $16.99/50 or 58.99/250 (as of 07/2018).

325gr TC (Hunter Supply) – irregular sprue
OAL Grains
0.7075 322.0
0.7055 320.3
0.7065 322.1
0.7080 (slight hollow base) 322.6
0.7090 (including sprue) 322.0

330 gr. RNFP Rim Rock says it can be used in 50 GI. Nominal specs OAL 0.713, Meplat 0.298, Nose to crimp groove 0.299. $34/100. ๐Ÿ‘Ž because they are smokier, and spendier, than the Badman Bullets RNFP.

330gr RNFP (Rim Rock)
OAL Grains
0.7090 327.1

๐Ÿ‘ Badman Bullets 330 gr. RNFP. Looks the the same as the Rim Rock RNFP, and is polymer coated. Price as of 5/2018 is $98/$188 per 500/1K. ๐Ÿ‘ It’s a big ball of lead, which is just right for the 50 GI. No smoke and lower price than a modern JHP 45 ACP bullet is a big plus. Not the most consistent bullet.

330gr RNFP poly-coated (Badman Bullets)
OAL Grains
0.7185 331.8
0.7090 327.7
0.7175 331.2
0.7080 328.2
0.7065 327

Rainier LeadSafe Bullets 50 Caliber (500 Diameter) 335 Grain Plated Flat Nose (#50335FP5). Copper plating is nominally 0.004″ thick. Maximum recommended velocity of 1,500 fps.
They have a cupped base, I measured it as 0.0285″ deep, but have low confidence in my caliper technique. Street price: $21.99/50 $84.99/500 on 07/2018.

335gr RAN-FP
OAL Grains
0.7485 333.0
0.7480 332.9
0.7490 333.3
0.7465 332.1

Berry’s 350 Grain Round Shoulder plated (with cannelure). “Can withstand velocities up to 2000 fps” so probably harder than optimal. Street price as of 6/2018 $0.22 (sale) to $0.29 each for the 500 count pack. They are intimidating to work up loads for because of their high weight.

350gr RS Berry
OAL Grains
0.7205 350.4
0.7195 349.5
0.7200 350.0
0.7205 350.4
0.7185 349.3

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