Just started loading flat based bullets like 110 vmax and 125 SMKs. They are pretty tough to seat as I have to carefully place the bullet in the mouth and hold it while slowly pulling the lever. Does anyone bell the mouth of any rifle case? I don’t see a lot of options for 300 BLk other than a Lyman die.
300 Blackout Flat Base Bullets
- Thread starter mdmp5
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Lyman Case Prep Multi Tool
The Lyman Case Prep Multi-Tool is a unique case prep tool that provides the reloader with all the essential case prep accessories in one compact,...
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This champher is long taper and works well for me.
I also load fb 223 bullets and do not have to hold them any since not long.
@Dolomite_Supafly and @Bob the nailer could shine some light on this. Both are well versed in the art of 300blk.
If youre not chamfering then you will be amazed at the difference it makes not digging a sharp square shoulder into the copper.
i use a 30 cal neck expander from lyman that i got from @kindabitey
set it to where it just barely flares out out the mouth of the case. makes it much easier to seat the bullets
set it to where it just barely flares out out the mouth of the case. makes it much easier to seat the bullets
I believe I have belled them a smidge for that bullet.
BTW, you should look at the Lee GC-312-155-2R. It works well in the BO. Just size them down to 0.309".
BTW, you should look at the Lee GC-312-155-2R. It works well in the BO. Just size them down to 0.309".
I chamfer the case mouths with jacketed bullets and flared when shooting lead bullets, either bare or coated.
You can also try a larger expander ball. I use RCBS because the expander balls are able to be swapped. RCBS will send you a 7.62x39 expander. Try it as is and crimp or you can chuck it into a drill and reduce the OD of the expander.
You can also try a larger expander ball. I use RCBS because the expander balls are able to be swapped. RCBS will send you a 7.62x39 expander. Try it as is and crimp or you can chuck it into a drill and reduce the OD of the expander.
I like the Lee universal expanding die for flat base bullets. I have one on every tool head.
Dillon 550. If I were to use an expander die in the press, it would make it entirely odd bc the belling would have to be in station 3, which is the seating station.
That is good news.
2 things. Get the Dillon 30 Carbine powder die. It will put a touch of bell on the case making it much easier to seat bullets.
As much as it pains me to suggest it, the Lee collet die for the 300 Whisper/Blackout is awesome.
I load a lot of 300 Whisper/Blackout subs using Gallant coated bullets on my 1050 and more precision orientated ammo on my 550. When I made these two changes, all my problems went away. Now I am back to cheap and quiet full auto mags dumps.
2 things. Get the Dillon 30 Carbine powder die. It will put a touch of bell on the case making it much easier to seat bullets.
As much as it pains me to suggest it, the Lee collet die for the 300 Whisper/Blackout is awesome.
I load a lot of 300 Whisper/Blackout subs using Gallant coated bullets on my 1050 and more precision orientated ammo on my 550. When I made these two changes, all my problems went away. Now I am back to cheap and quiet full auto mags dumps.
If the chamfered doesn't work well enough, bell the case mouths slightly with a cheap lee universal expansion die. Had to do this with 22Hornet and (thin) Winchester brass. Worked like dream.
"If it's stupid, but it works, it ain't stupid." ~Mr. Murphy
"If it's stupid, but it works, it ain't stupid." ~Mr. Murphy
I only slightly flare when loading the heavy 265 DS Special. F.L. resize then LEE collet die for cast coated or jacketed pills. Neck tension is everything with consistant subs as they are less forgiving with slight loading errors.
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