Sokwe wrote:pcallahan wrote:Is there a smaller p120 MWSS anyone knows of than this one?...

Can it not be made smaller with Michael Simkin's small p120 gun?

Yup, that does cut it down quite a bit:

`x = 65, y = 61, rule = LifeHistory`

52.3B.2A.A$51.5BA.2A$50.5B$50.4B$49.4B$48.4B.3B.B2.4B$41.18B.4B$40.3B

3A10B2A5B2A$40.3B2AB2A8B2A5B2A$40.3B2AB2A14B.B$38.7B2A12B2AB$37.13B2.

7B2A$37.10B6.8B$38.7B7.7B$36.8B6.10B$36.2A7B2.13B$35.B2A21B$33.B.22B$

32.2A5B2A16B$32.2A5B2A16B$33.4B.18B$33.4B2.B.3B.4B$44.4B$43.4B$34.2A

6.4B$34.A6.4B$22.3B2AB3.BA.A5.ABAB$20.4BABA3B.B2A5.B2AB$3.B4.BABA2B.B

2.5BA8B6.3BA$.3BA4BA2BA10BA2BA5B5.4B$.4B2A5B2A5B.3BA7B5.4B$2A8BA3B2A

8BABA3B5.4B$2AB.8B2A11B2AB6.4B$.B4.3BA2BA8BAB10.4B$8.BABA2B3.5B2A8.4B

$21.2A2B.4B.5B.B.B.B.B.B.B.B.B.B.B.B.A$22.35BA3BA$23.39BA$24.33BA4BA$

25.33B5A$26.35B$13.A5B6.3B.2B.B.B.B.B.B.B.B.B.B.B.B.B.B.B$6.B4.4A6B4.

4B$5.2AB.BABAB2A7B.5B$5.2A2BA2BAB3A12B$6.4BABAB2A13B$6.5B4A14B$8.B4.A

5B4.3BA3B$23.2B3A2B$23.B5AB$23.ABABABA$23.2A3B2A$23.7B$24.5B$24.2BA2B

$25.ABAB$25.ABAB$26.A3B$25.2A2B$24.B2A2B$25.2A!

But here's a smaller one by David Eppstein from the previous millennium (if you count 2000 as the last year of the thousand years, like you're officially supposed to):

`#C p120 MWSS gun`

#C David Eppstein, 5 March 2000

x = 56, y = 52, rule = B3/S23

21b2o$21bobo$9bo12b3o$6b4o3b2o8b3o6b2o$5b4o3b2o8b3o7b2o$5bo2bo3b2obob

2o2bobo$5b4o4bobob2o2b2o$6b4o3bob2o$9bo4$51b5o$50bo4bo$31bo23bo$2b3o

11b2o12b2o18bo3bo$bo3bo9b3o12bobo19bo$o5bo5bob2o5b2o$o5bo5bo2bo4bo2b2o

22bo$3bo8bob2o4b2ob2o22b3o$bo3bo9b3o3b3o26bo$2b3o11b2o31b2o$3bo18b3o

13b2o$38b2o$21bobobo$2b2o11b2o2b3obob3o$2b2o11bo2bo5bo3bo$9bo6b2obob2o

2b2obo4b2o14b2o3b2o$8b3o6bob2o2b2o2bo6b2o13b2o3b2o$7b5o5bo4bo2b2o6bo

12bo3b5o$6b2o3b2o3b2obobo2bo20b2o4bobo$15bo2b2ob4o20bobo$15b2o3bo30b3o

$10bo9bobo$10bo10b2o3bo$26b2o$6b2o17bobo$7bo42bo$4b3o42bobo$4bo43bo3bo

$10bo7bo30b3o$8bobo5b4o27b2o3b2o$2o4b2o8b2o2bo2b2o$2o4b2o11b2o2b2o$6b

2o7bo10b2o$8bobo4bo10b3o11b2o$10bo4bo10b2o12b2o4b4o$23b2o12b2o6b6o$23b

2o11b3o5bo3b2obo$37b2o6bo5bo$40b2o8bo$40b2o!

... which can be made less square and more exciting by modern technology, but it doesn't actually improve the bounding box:

`x = 72, y = 44, rule = B3/S23`

21b2o$21b2o$8bo4bo10b2o$6bobo4bo10b3o5b2o$4b2o7bo10b2o6b2o$4b2o11b2o2b

2o$4b2o8b2o2bo2b2o$6bobo5b4o$8bo7bo4$67b5o$66bo4bo$2b3o66bo$bo3bo10bo

49bo3bo$o5bo6b4o5bo45bo$2obob2o5b4o5b3o$12bo2bo4bob2o$12b4o3b2o2b2o31b

3o$3bo9b4o3b5o30bo3bo$2bobo11bo3b2o2bo13bo15b2obobo$2bobo32b2o15bo4bo$

3bo33bobo12b2ob4ob3o$21b2ob2o25b2obo4bo3bo$2b2o11b2o2b3obob3o22bo3bob

2obobobo$2b2o5bo5bo2bo4bo4bo21bobobob2obo3bo5b2o$8b3o5b2obob2o2b2obo

21bo3bo4bob2o6b2o$7b5o5bobo3b2o2bo23b3ob4ob2o$6bobobobo4bobob2o2b2o27b

o4bo7b4o$6b2o3b2o3b2obo4bo29bobob2o7bo3bo$15bo2b2ob4o29bo3bo10bobo$15b

2o3bo34b3o10b3o$20bobo$21b2o45b3o$53b2o9bo3bo2bo$6b2o44b4o7bobo4b2o$7b

o39bobo2bo2b3o5b2obo$4b3o39bo2bo2b2o9b2ob2o$4bo32b2o6b2o9bo6b2obo$37b

2o4b2o3bo8bo5bobo$45b2o10bo6bo$46bo2bo$47bobo!

If there are other cleverer ways to fit old and new pieces together to get a smaller bounding box, I'm not finding them:

`x = 73, y = 53, rule = LifeHistory`

41.B4.B2A3B$5.A.2A.3B26.8BA2BA3B$5.2A.A5B25.5A7BA4B2.B.BABA2B$10.5B

23.A5BA6BA7BA3BA4B$11.4B23.A2B.2A7BA2B.4BA10B$12.4B23.A4.3BA2BA7BA4BA

6B$.A2BA2.B.A2B.4B29.B2A10BA10B$.3BA.3BA2B2A10B27.8BA3BA6B.2A$A7BA5BA

10B25.ABA5B2.BABA2B.2BA2.A$2A7BABA2B2A9B24.B2AB4.B10.B3A$.B.3BA2BA3B

2A10B23.3BA4.4B8.B$3.A2BA4B3A13B20.4B5.3A3B7.3A$4.2A7B2.13B18.4B4.BA

3BA3B7.A.A$4.8B6.10B17.4B5.BABAB2AB.B4.A3.A$6.7B7.7B17.4B4.2B.AB.2BA.

3B3.4A$5.10B6.8B14.4B5.3A.4A.2A2B$5.13B2.7B2A13.4B4.BA3BA4.AB2A2B4.2A

$6.21B2AB11.4B4.2BABA.A.2A.A3BAB4.2A$8.22B.B8.4B6.BA3BA.2A.A.ABA2B$8.

16B2A5B2A6.4B7.2B2ABA4.A3BAB$8.16B2A5B2A5.4B9.2B2A.4A.3A$9.18B.4B5.4B

10.3B.A2B.BA.2B$16.4B.3B.B2.4B4.4B12.B.B2ABABAB$17.BABA14.ABAB14.3BA

3BAB$18.B2AB12.B2AB16.3B3A$19.A3B8.B.3BA19.4B$20.4B8.4B22.B$21.4B.4B.

5B.B.B.B.B.B.B.B.B.B.B.3B.B.B.B.B.A.B$22.45BA3BAB$23.49BA$24.43BA4BA$

25.43B5A$26.47B$13.3B2AB6.6B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.B.

B$6.B4.3BA2BA3B4.2A2B$5.2AB.4BA7B2A.3BAB$5.2A6BA6BA6BAB$6.7BA7B6A2B$

6.8BA2BA11B$8.B4.3B2AB4.7B$23.7B$23.2A3B2A$23.B5AB$23.B2AB2AB$23.B2AB

2AB$24.B3AB$24.5B$25.4B$25.4B$26.4B$25.4B$24.B2A2B$25.2A!

`x = 55, y = 60, rule = LifeHistory`

7.2A3.2A$7.A.A.A2.A.2A$9.A.2A.A.2A$4.4B2A.A2.A$4.7B2.2A$3.6B$3.5B10.B

$2.7B7.BA2B$2.7B5.B2A3B22.B2A.2A.A$2.7B4.B3A4BA19.BABABA.2A$2.2B3A2B

3.B.B2A2BA2B18.3BAB$2.BA3BAB2.BAB.2BA.2B.BA16.4B$2.A5BA2.3AB.4A.3B15.

4B$3.A3BA2.B3ABA4.ABA3B12.4B.3B.B2.4B$2.2B3AB2.A3B2A.2A.A.5B4.18B.4B$

3.B3A7B.A.2A.2A3BA4.16B2A5B2A$3.6B.3BABA4.AB3AB4.16B2A5B2A$2.7B3.3B.

4A.B3A5.22B.B$2.2B.4B3.AB.2B.A2B.BAB3.21B2AB$.8B5.2BA2B2AB.B3.13B2.7B

2A$.B3A5B4.A4B3AB3.11B6.8B$B2AB2A3BAB5.3B2AB4.9B7.7B$B2AB2AB.2B2A4.2B

AB6.8B6.10B$B5AB2.2A2B4.B7.B2A7B2.2B3AB3A4B$2A3B2A3.4B11.B2A10B4ABA2B

A2B$7B4.4B8.B.12BABA7B$7B5.4B6.2A5B2A15BA$.5B7.4B5.2A5B2A8B3A5B$.5B8.

4B5.4B.12B2A2B2A$.2A2B10.4B4.4B2.B.3B.4B$.4B11.4B14.4B$4B13.4B12.4B$.

4B13.4B8.B.4B$.2B2AB13.4B8.4B$3.2A15.4B.4B.5B.B.B.B.B.B.B.B.B.B.B$21.

34B$22.2BA25B5A$23.2B2A22BA4BA$24.2A28BA$25.24BA3BAB$12.4B2A6.6B.B.B.

B.B.B.B.B.B.B.B.A.B$5.B4.5BA3BA4.BA2B$4.2AB.6BA5BAB.BABAB$4.2A8BA3BAB

2A2BABAB$5.9BA5BA4BA2B$5.10BA3BA8B$7.B4.4B2A4.7B$22.2A3B2A$22.A5BA$

22.7B$22.BA3BAB$22.2B3A2B$23.5B$23.5B$24.4B$24.4B$25.4B$24.4B$23.B2A

2B$24.2A!

EDIT: Hmm, I wasn't trying very hard, obviously. Silly of me to even try using that p60, anyway, when a p30 works just as well with Paul's mechanism.