Since I just went through making 7.62x41 case I thought I'd publish the procedure used.

Started with a quantity of Win. and RP .257 Roberts cases.These cases were an acumulation from cases that had split necks out of my cousin's rifle.

Sawed them to length in a trim die filed them uniformly and deburred them while in the die.

Sized them in a .375x41 die

Trimmed the case length to 1.642"

deburred Inside and outside of neck

Turned the necks to a wall thickness of .012".

Full length resized them so they fit nicely in both 7.62x41 IMP rifles. The overall case length changed to about 1.632".

Annealed in bread pan with 1/2" of water.*

Loaded; 150gr. FMJ, Golden West Bullet. 31gr WCC844 (335), WLR,

Fired at range in a Mod. 200 with a Shaw barrel.Surprisingly good accuracy for a GW bullet.Achieved about 90% form. Case length reduced to about 1.625.

Lost NO cases during process or shooting.
* Annealing these shorty cases in water is more difficult than the longer cases as the water draws off the heat quicker.
I hope some of you find this helpfull. roger

Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..

I'm curious about the ballistics of this little cartridge???

quote:

Originally posted by El Deguello:
I'm curious about the ballistics of this little cartridge???

BW BT BM PT PW CASE Primer DATE Comments
150gr. psp 4198 31gr. CCI Mag. 2/16/1989 Good not Max.
" " " 29gr. Various " "
" " 3031 33 " " 3/16/1989 Accurate not max.
100gr plinker speer 4198 32gr " " 6/6/1989 NG Near Max.
" " " 3031 24gr. " " 08/30/89 OK
110gr 4198 20Gr. " " " OK
150gr. psp 3031 34gr. " " 03/17/89 near MAX. accurate
110gr. Speer 8208 33gr " " 02/20/90 not max. accurate
123gr .310dia. pfmj REM. 680 25gr " " 04/21/90 Accurate not max.
150gr. psp 680 27gr " " 7/90 NG NEAR MAX ?
" " 8208 29gr. " Win Mag " NG
125gr. psp 4198 34gr. " " " not max shows promise
110gr. rn 4198 34gr. " " " not max. looks good
180gr. psp. 3031 32.5gr " " 06/01/91 Good show
!80gr RN 8208 33gr " " 03/06/92 Rn don't feed, great, close to MAX.
!80gr RN 4198 27.5gr. " " 03/06/92 Good, feed problem
!80gr RN 8208 30gr. " " " Great " "
!80gr RN 3031 32.5 " " " " " "
110gr RN 680 20Gr. " " ": Cotton pack OK Sooty
123gr. .310dia. pfmj 4759 20gr. " " 04/30/93 Mild accurate
150gr. Mil 8208 34.5gr. " " " OK not max.
!80gr. psp. BW36 32gr. " " " great but dirty
150 gr. psp REM. Acc2200 29gr. FC.270 " 02/15/99 2B fire formed Not hot, accurate
125gr. psp REM. h110 25.5 mixed " 02/18/99 Ok Mild
150 gr. " REM. cavim 30 FC.270 " 11/09/99 flat primers looks like poor head space. 3" group at 50 yds.
180gr. RN 8208 30gr. " " 3" group at 50 yds. not max. bad feed
150gr. psp REM. BW36 36gr. " 11/19/99 2000fps accurate mild sooty
" " " 4198 29gr. wcc84 " " 2330fps. OK Clean Mild
" FN " " " " " " 2360fps.1" grp. at 50 yds mild clean
165GR. psp. Speer " " " " " MAX. 2320fps 2" group at 50 yds.
170gr. FN " " " " " " 2310fps. near max. 2" grp 50 yds.
180gr r n ? 8208 30.5gr. fc 270 " 04/09/00 MAX Accurate
110 rn speer 2200 29 WCC54 " " not max., accurate2347 to 2356 fps
123gr fmj .310 dia. " " " " " not max., accurate1971 to2081 fps
100 gr. plinker speer " " " " " 2189 to 2359 stinks
150gr. r n REM. " " " " " not max accurate 2152 to 2192 hot barrel
110gr. rnsp ? " " wcc84 " " 11/4" grp. 2184 to 2292 pleasant
110gr. fmj Rem. " " " " " 2270 To 2356 acc. nice plinker
100gr. plnker speer 4198 30gr. fc270 fed mag 12/01/00 2446-2575 NG
110gr. fmj. REM. 4198 30gr. wcc54 " " 2441-2544 pleasant super group 100yds.
123gr. .310dia. fmj ? 2230 C 29.5gr. WCC84 fed mag 10/09/02 Super 1858-1938 fps. Mild
" " " " " win.270 " " 1/2"grp. 1816-2000 fps. ?
" " " " " WCC54 " " ok cronograf spooky
" " " " " Front270 " " ok cronograf spooky 1" grp
" " " " " Mixed " " 1780- 1873
1 to 47 were Douglas Supreme barrel
150gr. fmjBT GW Turk 28gr. SL42 WLR 07/17/08 oal= 2.50" ,Shaw barrel, fire form, 2200 fps. Avg., good fire form load
160gr cast gas chk 7625 11gr. .257 rp " " oal= 2.320", Shaw barrel, 1462fps. Avg., fair fire form.
150gr. fmjBT GW " 10.2 gr. SL-42 " " oal=2.500", 1390 fps. Avg.Shaw barrel, Too Mild not a great fireform
168gr. " " Turk 27.5gr. .257 rp " 07/30/08
" " " 2015 28.9gr. SL-42 " " oal= 2.555", Shaw barrel, 2075 fps.avg. , mild , accurate out to 200yds. Great fire form
110gr. plycrb ? IMR4198 30.7 " 34 08/04/08 OAL= 2.350" , 2658 to 2696fps. Scope way off
150gr. BT-sp gw IMR4198 29gr. SL42 34 08/04/08 oal= 2.505"2360 to 2391 fps., good once hot
150gr. FMJ mil IMR4198 29gr. SL42 34 08/04/08 oal= 2.540", 2359 2392 fps., 3 shot 3/4" group at 50 yds. Not max.
148.6gr. sp ? IMR4198 29gr. SL42 34 08/04/08 oal=2.435", 2354 to 2395 fps. NG.
148.6gr. sp wcc846 36.2gr. 257rp 34 " oal=25.33", 2385 to 2410 fps. ,mild, soot, so-so
150gr. btsp GW wcc846 36.2gr. 257rp 34 " oal= 2.472", 2380 to 2395 fps., 3 shot 1/2" group at 50 yds.
150gr. fmj ? wcc846 36.2gr. 257rp 34 " Oal= 2.580", 2297 to2376 fps., 3 shot 3/4" group at 50 yds.
150gr. BTsp ? DP74 33.7gr. SL-42 34 " oal= 2.440", 2284 to 2310 fps., 4 shot 5/8" group at 50yds.
148.6gr. sp ? DP74 33.7gr. .257rp 34 " oal=2.470" , 2284 to 2325 fps. 1 1/2" group at 50 yds.
110gr. carb ? 2015 22.5gr. " " 09/17/08 oal=2.140", 1613 to 1657 Fps., Too mild, not great, UBP
150gr. Plated Berrey " " " " " oal=2.300", 1590 to 1649 fps. OK , UBP. Too mild
110gr Carbine 1625-1650 fps. Great
150gr. plated berrey Blue dot 12.5gr. SL 42 34 10/01/08 oal=2.297", mild, 1495 to 1565 fps., shows promise
" " " " 13.5gr " " " oal= 2.297", mild, 1512 to 1613FPS., not bad
!50gr. FMJ GW wcc844 34gr. FC.308 " " 2365 to 2400 NFG
168gr. fmj bt ? " " " " " oal=2.558", 2261 to 2320 fps.
174gr. cast gas chk 2200 26gr. SL 42 34 04/07/09 oal=2.418", 1607 to 1727 fps. Mild, clean, barks, DEADLY. Douglas barrel
177gr. " " " " " " " oal=2.410", 1659 to 1773 fps., some soot, barks, 1 1/2" group at 5o yds.DB*
174gr. " " 2015 24.5gr., .257RP #34 " oal=2.425", 1524 to 1602 fps., soot. UBP., NG., DB*
177gr. " " " " " " " oal=2.415", 1538 to 1667 fps. NOT GREAT douglas barrel*
194gr. Gas Chk 2 dia. 2200 26gr. SL 42 " " oal=2.474", 1710 to 1784 fps. Little soot, 4 shot 1/2" group at 50 yds.DB*
201gr " " 2015 24.5gr., .275RP #34 " oal=2.540", 1506 to 1563 fps., 1" group at 50yds.,DB*
194gr. " " " " " " " oal=2.465", 1528 to 1568 FPS., 3/4" group at 50yds. DB*

I'm not sure how good this will come out but see what happens. roger

Thanks