Glock 21 bullets

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gerardjohnson

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I bought a used Glock 21 and am not having much luck in the accuracy department. I have been shooting cast bullets and a friend recently told me that the type of rifling in the Glock is not compatible with lead bullets. He said I should be using jacketed, or at least copper plated bullets for best results. I tried the 700X load that works in my S&W revolver, but it won't cycle the Glock. The guy I bought it from used Trail Boss and the loads he gave me with the pistol worked fairly well. When I tried to duplicate the load, I shot 8"-9" groups @ 25 yds. and it didn't always cycle. I shoot cast mainly to save money so I can afford to shoot more. Is it going to make a big difference if I switch to copper copper coated or jacketed bullets? What powder works best for .45ACP? I haven't either .45 cal very long or shot them very often, so any advice is welcome. I do have a lot of 204 - 208 gr cast bullets, so would prefer to use those if they can be made to work.
 
Try powder coating the cast bullet. Epoxy coating might work as well. Google both Powder Coated and Epoxy Coated bullets. I've been experimenting with Epoxy Coated bullets for a while now, so far, so good. No lead fouling as tested on CZ 75 SP01 Shadowline and CZ 85 Combat. Coating somewhat gets into the grooves of the barrel. Very easy cleanup with bore cleaner and brush.
 
Leading will happen in your barrel eventually if you keep shooting cast. Maybe it was already leaded when you bought it? I've seen cast shot through G21s before and (in the beginning at least) didn't see any kind of degradation in accuracy you're describing.

If you want to keep shooting cast, I would buy another barrel and use it for cast. Lone Wolf's are drop in; Stormlake (I hear) might require some minor gunsmithing to fit properly.

As for powders, I only shoot 230gr FMJ/JHP, but I can tell you that Win231/HP38, Bullseye, Longshot, and Titegroup all work very well. I'm sure there are others that another CGNer will chime in with, but those are the ones I have a lot of experience with so I feel comfortable recommending.
 
Melnibonean said:
As for powders, I only shoot 230gr FMJ/JHP, but I can tell you that Win231/HP38, Bullseye, Longshot, and Titegroup all work very well. I'm sure there are others that another CGNer will chime in with, but those are the ones I have a lot of experience with so I feel comfortable recommending.
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+1 to the powders listed, although I haven't tried Longshot with 45acp.

What size are you bullets at? What does the bore slug at?

I don't have issues with my glock 17 and factory barrel. I clean the barrel every 500 rounds, if not longer.
 
I think all the worry about cast bullets in glock barrels is a load of horse####, myself...

Yeah, some old coot in Louisiana, who never cleaned his gun, blew his gun up after putting 10,000 cast bullets through his glock. So the glock legal department puts out a memoranda stating that using cast bullets in their gun is a no-no, just as a CYA.
 
cast will work fine, but will lead faster in the polygonal barrels then in conventional ones. Just clean when you see signs of excess leading or deteriorating accuracy, and check after each session. Sounds like your loads are very light, and i'd look at a faster powder. In 45 i generally use unique, or bullseye, but win 231 is another winner, or power pistol or tite group. 700X will work, but don't load it light, near max for best results. Remember there's no minimum impulse needed in a revolver, in an auto, you need enough umph to cycle the action.
 
gerardjohnson said:
I bought a used Glock 21 and am not having much luck in the accuracy department. I have been shooting cast bullets and a friend recently told me that the type of rifling in the Glock is not compatible with lead bullets. He said I should be using jacketed, or at least copper plated bullets for best results. I tried the 700X load that works in my S&W revolver, but it won't cycle the Glock. The guy I bought it from used Trail Boss and the loads he gave me with the pistol worked fairly well. When I tried to duplicate the load, I shot 8"-9" groups @ 25 yds. and it didn't always cycle. I shoot cast mainly to save money so I can afford to shoot more. Is it going to make a big difference if I switch to copper copper coated or jacketed bullets? What powder works best for .45ACP? I haven't either .45 cal very long or shot them very often, so any advice is welcome. I do have a lot of 204 - 208 gr cast bullets, so would prefer to use those if they can be made to work.
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When I had my glock 21 I shot berry's plated 230gr rn with 4.7 titegroup with good accuracy.

I would size your cast boolits to .452 to start and see if that helps. As others have stated poly rifling will give you leading especially if undersized boolits are used. Some deal with it by cleaning the barrel after every couple hundred fired. For the price of a lone wolf barrel it might be your best bet.
 
for cast i'd size 452-453. And if your casting your own use a good lube that's not too hard. Faster powders will give you best results as well with the cast. Don't go to hard on the alloy either. I have close friends who are able to run 750-1000 rounds of lead between cleanings in their glock barrels. That said, they also monitor build up every time they shoot. Caution is free and sensible :)
 
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