248:
279:
233:
263:
30:
175:
116:
47:
247:
186:. Later, Hermann Gerlich in the 1920s and 1930s experimented with the concept resulting in an experimental 7cm anti-tank rifle with a 1,800 m/s (5,900 ft/s). This led to the squeeze bore concept sometimes being called the "
212:
adapter and a version of the M2 machine gun produced during WW2. Squeezing down from 40mm to 30mm, 57mm to 42.6mm, and .50 caliber to .30 caliber respectively. The
Littlejohn adapter was used to extend the service life of the
106:
which fills out the caliber. As the projectile travels through the squeeze bore the flanges fold inwards, resulting in a reduced caliber round with an increased velocity compared to a traditional full-caliber round.
232:
278:
262:
135:
down, increasing penetration and velocity significantly. This process also meant high chamber pressure and low barrel service life. For example, the service life of a squeeze bore
166:, which is based on the same concept of using a larger caliber barrel to fire a smaller caliber projectile at high-speed, negated the need for the squeeze bore concept.
201:(in 1941) produced the 7.5 cm Pak 41. These were eventually discontinued due to the lack of tungsten and manufacturing complexity for the ammunition.
182:
The squeeze bore concept was first patented by German Karl Puff in 1903, even though the general principle was known already in 19th century and used in
58:
163:
560:
143:. The diameter of a fired shell could decrease as much as 40% from .50 caliber to .30 caliber (achieved in a version of the
591:
596:
422:
269:
218:
99:
359:
214:
209:
221:
whose anglicized name gave the
Littlejohn its designation. The QF 6-pounder adapter was never adopted.
533:
98:
resulting in a reduced final internal diameter. These weapons are used in conjunction with special
452:
399:
289:
205:
132:
174:
147:). Rather than squeezing solid shot, this is accomplished through a hardened penetrator core (
115:
95:
29:
155:) forming flanges or wings. This outer jacket was crushed as the projectile left the barrel.
303:
158:
The squeeze bore concept typically was used in anti-tank guns before the widespread use of
371:
152:
315:
238:
144:
64:
585:
325:
320:
285:
253:
183:
159:
140:
136:
52:
35:
350:
Rollof, Yngve. "Artillerimaterielens utvecklingstendenser under senaste decenniet".
504:
444:
391:
124:
91:
148:
561:"Mauser's high-tech antitank gun: the 2.8cm sPzB 41 - The Firearm Blog"
445:"Q&A #17: Bullpups, Stocked Pistols, Delayed Blowback, and More!"
392:"Q&A #9: Gas Impingement, Reading List, Squeeze-Bores, and More!"
241:
squeeze-bore anti-tank gun captured by
British forces in Sicily 1943.
194:
128:
103:
139:
could be as low as 1000 rounds compared to 5000-7000 rounds for the
198:
114:
477:
46:
354:. Number 7 1953 – via Kungliga ĆrlogsmannasƤllskapet.
272:
with an 8,8 cm squeeze-bore adapter attached to the muzzle.
178:
The original patent filed by
Hermann Gerlich in 1932
478:"Exotic Barrels Part 1: Squeeze Bores | WeaponsMan"
204:Other uses of the squeeze bore include the British
256:light squeeze-bore anti-tank gun in Italy 1943.
102:where the projectile is fitted with soft-metal
94:diameter progressively decreases towards the
8:
472:
470:
123:A squeeze bore utilizes the energy of the
173:
151:for example) and a softer outer jacket (
337:
228:
438:
436:
367:
357:
385:
383:
381:
197:produced the 2.8 cm sPzB 41 and
7:
345:
343:
341:
119:Diagram of the squeeze bore concept
390:McCollum, Ian (18 February 2017).
59:Armor-piercing composite non-rigid
14:
90:, is a weapon where the internal
277:
261:
246:
231:
45:
28:
22:Historical squeeze bore example:
455:from the original on 2021-12-20
443:McCollum, Ian (24 April 2018).
402:from the original on 2021-12-20
127:to squeeze the diameter of the
1:
423:"Anti-tank Ammunition Types"
162:. Later, the perfection of
613:
512:www.freepatentsonline.com
421:Ankerstjerne, Christian.
559:S, Rusty (20 May 2016).
352:Tidskrift i SjƶvƤsendet
270:10 cm schwere Kanone 18
310:Squeeze bore artillery
179:
120:
100:sub-caliber ammunition
514:. Free Patents Online
177:
164:discarding sabot ammo
118:
592:Artillery components
288:with a squeeze-bore
286:Mk VII Tetrarch Mk I
217:and was designed by
141:7.5 cm Pak 39 (L/48)
538:Shooting with Hobie
55:flange-projectiles.
597:Firearm components
503:Gerlich, Hermann.
290:Littlejohn adaptor
206:Littlejohn adaptor
180:
121:
540:. 12 January 2011
449:Forgotten Weapons
396:Forgotten Weapons
219:FrantiÅ”ek JaneÄek
193:Between 1939-40,
188:Gerlich principle
170:History and usage
604:
576:
575:
573:
571:
565:The Firearm Blog
556:
550:
549:
547:
545:
530:
524:
523:
521:
519:
509:
500:
494:
493:
491:
489:
474:
465:
464:
462:
460:
440:
431:
430:
418:
412:
411:
409:
407:
387:
376:
375:
370:has extra text (
369:
365:
363:
355:
347:
304:Choke (firearms)
281:
265:
250:
235:
78:, alternatively
49:
38:squeeze bore gun
32:
612:
611:
607:
606:
605:
603:
602:
601:
582:
581:
580:
579:
569:
567:
558:
557:
553:
543:
541:
532:
531:
527:
517:
515:
507:
502:
501:
497:
487:
485:
476:
475:
468:
458:
456:
442:
441:
434:
427:panzerworld.com
420:
419:
415:
405:
403:
389:
388:
379:
366:
356:
349:
348:
339:
334:
300:
293:
282:
273:
266:
257:
251:
242:
236:
227:
172:
153:aluminium alloy
113:
72:
71:
70:
69:
68:
62:
56:
50:
41:
40:
39:
33:
24:
23:
17:
12:
11:
5:
610:
608:
600:
599:
594:
584:
583:
578:
577:
551:
534:"Squeeze Bore"
525:
495:
482:weaponsman.com
466:
432:
413:
377:
336:
335:
333:
330:
329:
328:
323:
318:
316:2.8 cm sPzB 41
307:
306:
299:
296:
295:
294:
283:
276:
274:
267:
260:
258:
252:
245:
243:
239:2.8 cm sPzB 41
237:
230:
226:
223:
195:Mauser-Werk AG
184:Armstrong guns
171:
168:
160:shaped charges
145:M2 machine gun
112:
109:
88:conical barrel
65:Armor-piercing
51:
44:
43:
42:
34:
27:
26:
25:
21:
20:
19:
18:
15:
13:
10:
9:
6:
4:
3:
2:
609:
598:
595:
593:
590:
589:
587:
566:
562:
555:
552:
539:
535:
529:
526:
513:
506:
499:
496:
483:
479:
473:
471:
467:
454:
450:
446:
439:
437:
433:
428:
424:
417:
414:
401:
397:
393:
386:
384:
382:
378:
373:
368:|volume=
361:
353:
346:
344:
342:
338:
331:
327:
326:7.5 cm Pak 41
324:
322:
321:4.2 cm Pak 41
319:
317:
314:
313:
312:
311:
305:
302:
301:
297:
291:
287:
280:
275:
271:
264:
259:
255:
254:4.2 cm Pak 41
249:
244:
240:
234:
229:
224:
222:
220:
216:
211:
207:
202:
200:
196:
191:
189:
185:
176:
169:
167:
165:
161:
156:
154:
150:
146:
142:
138:
137:7.5 cm Pak 41
134:
130:
126:
117:
110:
108:
105:
101:
97:
93:
89:
85:
81:
77:
66:
60:
54:
53:7.5 cm Pak 41
48:
37:
36:7.5 cm Pak 41
31:
568:. Retrieved
564:
554:
542:. Retrieved
537:
528:
516:. Retrieved
511:
505:"Projectile"
498:
486:. Retrieved
484:. WeaponsMan
481:
457:. Retrieved
448:
426:
416:
404:. Retrieved
395:
360:cite journal
351:
309:
308:
215:QF 2-pounder
210:QF 6-pounder
203:
192:
187:
181:
157:
122:
87:
83:
79:
76:squeeze bore
75:
73:
451:. Youtube.
398:. Youtube.
84:cone barrel
16:Weapon type
586:Categories
332:References
125:propellant
80:taper-bore
268:A German
111:Mechanism
453:Archived
400:Archived
298:See also
149:tungsten
518:18 July
225:Gallery
104:flanges
63:Right:
61:(APCNR)
570:8 July
544:8 July
488:6 July
459:6 July
406:8 July
129:bullet
96:muzzle
92:barrel
57:Left:
508:(PDF)
199:Krupp
133:shell
572:2018
546:2018
520:2018
490:2018
461:2018
408:2018
372:help
208:, a
67:(AP)
190:".
131:or
86:or
588::
563:.
536:.
510:.
480:.
469:^
447:.
435:^
425:.
394:.
380:^
364::
362:}}
358:{{
340:^
292:.
284:A
82:,
74:A
574:.
548:.
522:.
492:.
463:.
429:.
410:.
374:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
