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Post by bula on Nov 11, 2023 11:08:59 GMT -5
In 480, a deepseated 340gr SWC on only 6grs of Unique will chug right on thru in/out, a new steel drum that is on it's way to being a burn barrel.
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Post by cas on Nov 11, 2023 15:38:10 GMT -5
Yep, mine are so I can shoot the 270's in the FA97. They're seated to the depth they are so there's just a little bump in the transition from bullet to case. They don't hang up on a 90 degree lip.
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Post by blackmamba on Nov 12, 2023 9:09:29 GMT -5
If you use RFN bullets to deep-seat on the ogive you don't have that problem transition from bullet to case and they chamber nicely.  |
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djoch
.240 Incinerator
Posts: 30
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Post by djoch on Nov 14, 2023 9:25:42 GMT -5
SO GUYS, AFTER 50+ YEARS OF HAPPILY CRIMPING IN CRIMP GROOVES WHAT IS THERE IN DEEP SEATING THAT SHOULD MAKE ME WANT TO CHANGE CHANGE, i.e. WHAT ARE THE PROS AND CONS? ***** DEEP SEATING Pro* Save 1 or more grains of powder (for same velocity). * Hold back pressure wave (minutely). * Reduce muzzle blast (minutely). * Accomodate longer bullet ogive----chamber rifle bullet in revolver; design SWC with long ogive (Bradshaw-Martin SWC GC). * Lower extreme spread (for some loads). * Works with fast, medium, and slow powders. * Especially suited to cast bullets. * “Special” level loads in magnum cases; .45 Colt loads in .454 Casull brass. Con* Not for full house loads----maximum charge of slow powder.. * Not macho looking. David Bradshaw |
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djoch
.240 Incinerator
Posts: 30
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Post by djoch on Nov 14, 2023 9:42:58 GMT -5
I have never reloaded but have been doing lots of research lately. Question: For a targeted load of XX grains of Powder ABC and a specific weight bullet, I don’t understand how deep seating that bullet saves powder. Does the powder react differently in a slightly reduced case volume so you can use less? Do you use a different powder? Thanks in advance.
-Dave
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Post by blackmamba on Nov 14, 2023 22:45:36 GMT -5
Seating deeper reduces the powder space under the bullet, which increases pressure. So in the smaller powder space it takes less powder to give the same or very similar pressure and velocity.
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Post by x101airborne on Nov 17, 2023 7:33:23 GMT -5
It can also make dirty burning powders burn clean. I have a MP mold in 45 cal, a swc that with the large hollow point pins comes out at 225 grains. I powder coat and size to .452. Using a 12 steel keg of Dupont 700-X powder, I weigh out 6.5 grains and tried both crimped in crimp groove and deep seated over the lip of the front drive band. I just wanted a load to pop critters around the farm and the hollow point to reduce skipping off water shooting turtles or nutria rats. (I got cows to worry about.) The regular seated loads produced mediocre accuracy and the cases need to be left in my pocket going through the washing machine. Deep seated on the same recipe gave MUCH better accuracy and the cases are almost as clean once fired as they were before they were loaded. Tells me I am finding the "sweet spot" for this powder to have enough pressure to burn clean. By the books, the regular crimped load is a SAA safe load. I imagine the deep seated load is barely a +P, but I am shooting it in a large frame BH so I dont worry about it.
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Deleted
Deleted Member
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Post by Deleted on Nov 17, 2023 8:25:07 GMT -5
It can also make dirty burning powders burn clean. I have a MP mold in 45 cal, a swc that with the large hollow point pins comes out at 225 grains. I powder coat and size to .452. Using a 12 steel keg of Dupont 700-X powder, I weigh out 6.5 grains and tried both crimped in crimp groove and deep seated over the lip of the front drive band. I just wanted a load to pop critters around the farm and the hollow point to reduce skipping off water shooting turtles or nutria rats. (I got cows to worry about.) The regular seated loads produced mediocre accuracy and the cases need to be left in my pocket going through the washing machine. Deep seated on the same recipe gave MUCH better accuracy and the cases are almost as clean once fired as they were before they were loaded. Tells me I am finding the "sweet spot" for this powder to have enough pressure to burn clean. By the books, the regular crimped load is a SAA safe load. I imagine the deep seated load is barely a +P, but I am shooting it in a large frame BH so I dont worry about it. Interesting results. I have some test loads ready with the 270saa. Hoping to test this weekend. |
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Deleted
Deleted Member
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Post by Deleted on Nov 18, 2023 10:52:44 GMT -5
Deep seating is no joke. I tried David Bradshaws 45 colt, 6.7g hp38 with my 270saa bullet. Cut my spreads and deviations in half.
20 shots from my Harton 4 5/8 blckhawk.
Min 846
Avg 853
Max 859
Spread 13
Std dev. 4
NM flattop did 890 with spread and dev a little higher but still about half of my favored 7.5gr grain load seated in the groove. Avg fps within a few fps of the standard seated load as well. I used cci 300 for the best numbers. Winchester large pistol were not quite as good but accuracy variables were not noticeable.
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Deleted
Deleted Member
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Post by Deleted on Nov 19, 2023 9:40:13 GMT -5
I have never reloaded but have been doing lots of research lately. Question: For a targeted load of XX grains of Powder ABC and a specific weight bullet, I don’t understand how deep seating that bullet saves powder. Does the powder react differently in a slightly reduced case volume so you can use less? Do you use a different powder? Thanks in advance. -Dave Dropping my hp38 charge from 7.5 for crimp groove seated to 6.7g for deep seated my avg fps was 4 fps different. Im saving nearly a grain of powder for each shot and my extreme spread and standard deviation were cut in half. Definitely more efficient. You would only deep seat in large capacity cases. I dont think cases that are already minimal such as 45acp or 9mm luger would be good candidates. |
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