Just got into the 300 blackout game. Got the upper almost finished (just need sights, flash hider, bcg, ch) but I wanted to start reloading now.
I was just wondering what you guys are resizing your cast bullets to. I know the 300 has a .308 bore so I was going to do a .309.
Any input is greatly appreciated.
Resizing cast boolits
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Re: Resizing cast boolits
Anyone? I was wanting to order the last few tidbits so I could get some rounds ready
Re: Resizing cast boolits
Order 309" bullets if you can. I have a 308" sizer A 309" may have been a better choice. Either will do. Some feel 309 will yield less leading and more accuracy. I have shot 308" and 309" with no difference... The 307" bullets I got were a big problem as seating was a problem with loose bullets.
I have shot a LOT of subsonic cast bullets in my BLK. Only problem I have with the 200-210 gr is primers backing out after I load them. I need to re-seat the primers the day I shoot them. Again today.. I sorted 50 and one had backed out enough I could feel it, and 7-8 were backed out to just flush, but off the bottom of the primer pocket. (both factory Rem primed brass and my reloaded rem 7 1/2 primers)
I think this may be unique to long cast bullets as the lube makes a very good air seal keeping the pressure in the case high for a long time. So... Load then check a week or 2 later to see if the primers moved due to air pressure.
I am now using a 190 spire point in the bolt gun and seem to no longer have the problem. The 190 displaces much less volume in the case when seated . I am hoping the spire point being base heavy will flip faster in soft tissue. Makes a fun plinker too. I paid $.09 each I have 1300 left. Used up most of my 210's, but found a good 205 gr .30 from a local caster.
Just wondering if you are using a bolt of AR platform?
Welcome to the cast bullet BLK realm.
I have shot a LOT of subsonic cast bullets in my BLK. Only problem I have with the 200-210 gr is primers backing out after I load them. I need to re-seat the primers the day I shoot them. Again today.. I sorted 50 and one had backed out enough I could feel it, and 7-8 were backed out to just flush, but off the bottom of the primer pocket. (both factory Rem primed brass and my reloaded rem 7 1/2 primers)
I think this may be unique to long cast bullets as the lube makes a very good air seal keeping the pressure in the case high for a long time. So... Load then check a week or 2 later to see if the primers moved due to air pressure.
I am now using a 190 spire point in the bolt gun and seem to no longer have the problem. The 190 displaces much less volume in the case when seated . I am hoping the spire point being base heavy will flip faster in soft tissue. Makes a fun plinker too. I paid $.09 each I have 1300 left. Used up most of my 210's, but found a good 205 gr .30 from a local caster.
Just wondering if you are using a bolt of AR platform?
Welcome to the cast bullet BLK realm.
Long distance, the next best thing to being there!
Re: Resizing cast boolits
If you're BUYING cast bullets, they're generally already sized. If you're casting your own, you might want to size them.
Re: Resizing cast boolits
Some bullets come ready for gas checks but w/o them. The 358" Hunter bullets i buy are lubed and sized but no gas check. I add them.rjrivero wrote:If you're BUYING cast bullets, they're generally already sized. If you're casting your own, you might want to size them.
But yes, most bullets i get are already sized and lubed and need nothing more before using.
Long distance, the next best thing to being there!
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Re: Resizing cast boolits
Yes this is an AR platform and yes I will be casting my own.
Reason I want to go with a bigger sized bullet is because the Lee Mold is a 155 GR but .311 bullet (7.62x39).
This mold is one of the very few I can find that is not a flat nose so should feed easier in an AR platform. I was about ready to order right now and if I did I would be getting a .309 sizing die!
Reason I want to go with a bigger sized bullet is because the Lee Mold is a 155 GR but .311 bullet (7.62x39).
This mold is one of the very few I can find that is not a flat nose so should feed easier in an AR platform. I was about ready to order right now and if I did I would be getting a .309 sizing die!
Re: Resizing cast boolits
BrownSunshine wrote:Yes this is an AR platform and yes I will be casting my own.
Reason I want to go with a bigger sized bullet is because the Lee Mold is a 155 GR but .311 bullet (7.62x39).
This mold is one of the very few I can find that is not a flat nose so should feed easier in an AR platform. I was about ready to order right now and if I did I would be getting a .309 sizing die!
Cast bullets are not like Jacketed when it comes to DIA. The .311 is just right for a .308 bore. I shoot a 190 gr SPIRE POINT Gas Checked bullet in my BLK. I have 1500 of them. They feed flawlessly in the Micro7. They hit fairly hard. I load them to 1000 fps 5.2 gr of American Select.
They are sized to .309 per the mfg. .310 is what I would size them at If I was doing it. .002 over BORE dia. Groove is larger and is why .311 is just fine.
I was shooting mine at 100 yards today. The sound of the bullet is slick! My report is so quiet I hear the bullet fly. Love the bolt in a suppressed platform. Hard to beat.
Long distance, the next best thing to being there!
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Re: Resizing cast boolits
JohnInNH wrote:BrownSunshine wrote:Yes this is an AR platform and yes I will be casting my own.
Reason I want to go with a bigger sized bullet is because the Lee Mold is a 155 GR but .311 bullet (7.62x39).
This mold is one of the very few I can find that is not a flat nose so should feed easier in an AR platform. I was about ready to order right now and if I did I would be getting a .309 sizing die!
Cast bullets are not like Jacketed when it comes to DIA. The .311 is just right for a .308 bore. I shoot a 190 gr SPIRE POINT Gas Checked bullet in my BLK. I have 1500 of them. They feed flawlessly in the Micro7. They hit fairly hard. I load them to 1000 fps 5.2 gr of American Select.
They are sized to .309 per the mfg. .310 is what I would size them at If I was doing it. .002 over BORE dia. Groove is larger and is why .311 is just fine.
I was shooting mine at 100 yards today. The sound of the bullet is slick! My report is so quiet I hear the bullet fly. Love the bolt in a suppressed platform. Hard to beat.
John you do love you M7
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Re: Resizing cast boolits
John; I have a Lyman cast(311291) 170gr with GC that actually casts @ .311 with 50/50 WW & Pure Lead that I plan to shoot in my 300 Blk. In your opinion is that a heavy enough bullet to run subsonic? What Pwd would you use?JohnInNH wrote:BrownSunshine wrote:Yes this is an AR platform and yes I will be casting my own.
Reason I want to go with a bigger sized bullet is because the Lee Mold is a 155 GR but .311 bullet (7.62x39).
This mold is one of the very few I can find that is not a flat nose so should feed easier in an AR platform. I was about ready to order right now and if I did I would be getting a .309 sizing die!
Cast bullets are not like Jacketed when it comes to DIA. The .311 is just right for a .308 bore. I shoot a 190 gr SPIRE POINT Gas Checked bullet in my BLK. I have 1500 of them. They feed flawlessly in the Micro7. They hit fairly hard. I load them to 1000 fps 5.2 gr of American Select.
They are sized to .309 per the mfg. .310 is what I would size them at If I was doing it. .002 over BORE dia. Groove is larger and is why .311 is just fine.
I was shooting mine at 100 yards today. The sound of the bullet is slick! My report is so quiet I hear the bullet fly. Love the bolt in a suppressed platform. Hard to beat.
Thanks
Sparky45
Re: Resizing cast boolits
Sparky45 wrote:John; I have a Lyman cast(311291) 170gr with GC that actually casts @ .311 with 50/50 WW & Pure Lead that I plan to shoot in my 300 Blk. In your opinion is that a heavy enough bullet to run subsonic? What Pwd would you use?JohnInNH wrote:BrownSunshine wrote:Yes this is an AR platform and yes I will be casting my own.
Reason I want to go with a bigger sized bullet is because the Lee Mold is a 155 GR but .311 bullet (7.62x39).
This mold is one of the very few I can find that is not a flat nose so should feed easier in an AR platform. I was about ready to order right now and if I did I would be getting a .309 sizing die!
Cast bullets are not like Jacketed when it comes to DIA. The .311 is just right for a .308 bore. I shoot a 190 gr SPIRE POINT Gas Checked bullet in my BLK. I have 1500 of them. They feed flawlessly in the Micro7. They hit fairly hard. I load them to 1000 fps 5.2 gr of American Select.
They are sized to .309 per the mfg. .310 is what I would size them at If I was doing it. .002 over BORE dia. Groove is larger and is why .311 is just fine.
I was shooting mine at 100 yards today. The sound of the bullet is slick! My report is so quiet I hear the bullet fly. Love the bolt in a suppressed platform. Hard to beat.
Thanks
Sparky45
170 gr apparently will not be enough weight to get the port pressure up enough to cycle an AR. In a bolt.. 231, American Select, Unique, all should work.. as I said earlier I have gone to American Select for all my cast bullet loads for my bolt gun.
I am hoping my AR upper (due in in 2 weeks) will work with 190's with a light buffer, Timminy trigger, and cut down flat wire spring by changing to A1680 powder. It may not. The Timminy trigger takes a LOT less energy to reset than a stock AR FCG.
I will go to a heaver bullet 210-230 (flat base gas check) But in a bolt.. I am having very nice results with the loads using American Select in weights 150-210.
Long distance, the next best thing to being there!
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